ISL3333IRZ [INTERSIL]
3.3V, ±15kV ESD Protected, Two Port, Dua Protocol RS-232/RS-485 Transceivers; 3.3V ， ±15kV ESD保护，双端口，杜阿协议的RS - 232 / RS - 485收发器
| 型号： | ISL3333IRZ |
| 厂家： | 
Intersil |
| 描述： | 3.3V, ±15kV ESD Protected, Two Port, Dua Protocol RS-232/RS-485 Transceivers |
| 文件： | 总26页 (文件大小：946K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ISL3332, ISL3333
¬
Data Sheet
May 27, 2008
FN6362.0
3.3V, ±15kV ESD Protected, Two Port, Dual
Protocol (RS-232/RS-485) Transceivers
Features
• ±15kV (HBM) ESD Protected Bus Pins (RS-232 or
RS-485)
The ISL3332, ISL3333 are two port interface ICs where each
port can be independently configured as a single
RS-485/422 transceiver, or as a dual (2 Tx, 2 Rx) RS-232
transceiver. With both ports set to the same mode, two
RS-485/RS-422 transceivers, or four RS-232 transceivers
are available.
• Operates From a Single 3.3V Supply
• Two Independent Ports, Each User Selectable for RS-232
(2 Transceivers) or RS-485/RS-422 (1 Transceiver)
• True Flow-Through Pinouts Simplify Board Layouts
• Pb-free (RoHS compliant)
If either port is in RS-232 mode, the onboard charge pump
generates RS-232 compliant ±5V Tx output levels from a
• Full Failsafe (Open/Short) Rx in RS-485/422 Mode
• Loopback Mode Facilitates Board Self Test Functions
single V
supply as low as 3.15V. The transceivers are
CC
RS-232 compliant, with the Rx inputs handling up to ±25V.
• User Selectable RS-485 Data Rates (ISL3333 Only)
- Fast Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Mbps
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 115kbps
In RS-485 mode, the transceivers support both the RS-485
and RS-422 differential communication standards. The
receivers feature "full failsafe" operation, so the Rx outputs
remain in a high state if the inputs are open or shorted
together. The transmitters support up to three data rates, two
of which are slew rate limited for problem free
communications. The charge pump disables when both
ports are in RS-485 mode, thereby saving power, minimizing
noise, and eliminating the charge pump capacitors.
• Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 400kbps
• RS-232 Tx and Rx Enable Pins (ISL3333 Only)
• Small Charge Pump Caps . . . . . . . . . . . . . . . . . 4 x 0.1µF
• Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . .35µA
• QFN Package Saves Board Space (ISL3333 Only)
Both RS-232 and RS-485 modes feature loopback and
shutdown functions. Loopback internally connects the Tx
outputs to the corresponding Rx input, to facilitate board
level self test implementation. The outputs remain connected
to the loads during loopback, so connection problems (e.g.,
shorted connectors or cables) can be detected. Shutdown
mode disables the Tx and Rx outputs, disables the charge
pumps, and places the IC in a low current (35µA) mode.
• Logic Supply Pin (V ) Eases Operation in Mixed Supply
L
Systems (ISL3333 Only)
Applications
• Gaming Applications (e.g., Slot Machines)
• Single Board Computers
The ISL3333 is a QFN packaged device that includes two
additional user selectable, lower speed and edge rate
options for EMI sensitive designs, or to allow longer bus
• Factory Automation
• Security Networks
lengths. It also features a logic supply pin (V ) that sets the
• Industrial/Process Control Networks
• Level Translators (e.g., RS-232 to RS-422)
• Point of Sale Equipment
L
V
level of logic outputs, and the switching points of logic
OH
inputs, to be compatible with another supply voltage in mixed
voltage systems. The QFN also adds RS-232 mode Tx EN
pins (DEN), and active low Rx enable pins (RXEN) to
increase design flexibility. In RS-485 applications, active low
Rx enable pins allow Tx/Rx direction control, via a single
signal per port, by connecting the corresponding DE and
RXEN pins together.
• Dual Channel RS-485 Interfaces
For a single port version of these devices, please see the
ISL3330, ISL3331 data sheet.
TABLE 1. SUMMARY OF FEATURES
NO. OF
PORTS
RS-485 DATA RS-232 DATA
RS-232 Tx ACTIVE H or L LOW POWER
PART NUMBER
PACKAGE OPTIONS
V PIN?
L
RATE (bps)
RATE (kbps)
400
ENABLE?
Rx ENABLE? SHUTDOWN?
ISL3332
ISL3333
2
2
28 Ld SSOP
20M
NO
NO
NONE
L
YES
YES
40 Ld QFN (6 x 6mm) 20M, 460k, 115k
400
YES
YES
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2008. All Rights Reserved.
1
All other trademarks mentioned are the property of their respective owners.
ISL3332, ISL3333
Ordering Information
PART NUMBER
(NOTE)
TEMP. RANGE
PACKAGE
(Pb-Free)
PART MARKING
(°C)
PKG. DWG. #
M28.209
L40.6x6
ISL3332IAZ*
ISL3333IRZ*
3332 IAZ
3333 IRZ
-40 to +85
-40 to +85
28 Ld SSOP
40 Ld QFN
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations).
Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J
STD-020.
Pinouts
ISL3332 (28 LD SSOP)
ISL3333 (40 LD QFN)
TOP VIEW
TOP VIEW
C1+
C1-
V+
1
2
3
4
5
6
7
8
9
28 C2+
27 C2-
40 39 38 37 36 35 34 33 32 31
26
25
24
23
22
V
CC
R
R
D
D
A1
B1
A1
V+
A1
1
2
3
4
5
6
7
8
9
30
29
28
27
26
25
24
23
22
21
R
R
B1
A1
B1
Y1
/DE1
Z1
Y1
B1
D
D
/DE
1
Z1
Z1
SEL1
SEL2
21 LB
Y1
Y1
20
19
18
17
16
ON/OFF
LB
Z1
Z2 10
Y2 11
D
D
R
R
Y2
ON/OFF
SEL1
SEL2
Z2
/DE2
Z2
A2
B2
B2 12
D
Y2
A2 13
D
R
R
/DE
Z2
2
GND 14
15 V-
Y2
A2
B2
B2 10
11 12 13 14 15 16 17 18 19 20
FN6362.0
May 27, 2008
2
ISL3332, ISL3333
TABLE 2. ISL3332 FUNCTION TABLE
INPUTS
RECEIVER OUTPUTS
DRIVER OUTPUTS
CHARGE PUMPS
(NOTE 1)
SEL1 or 2
ON/OFF
DE 1 or 2
R
R
Y
Z
MODE
RS-232
Shutdown
RS-485
RS-485
A
B
0
X
1
1
1
0
1
1
N.A.
X
ON
High-Z
ON
ON
ON
ON
ON
High-Z
High-Z *
High-Z *
High-Z
High-Z
ON
High-Z
High-Z
ON
OFF
OFF
OFF
0
1
ON
NOTE:
1. Charge pumps are off if SEL1 = SEL2 = 1, or if ON/OFF = 0. If ON = 1, and either port is programmed for RS-232 mode, then the charge pumps
are on.
ISL3332 Truth Tables(FOR EACH PORT)
RS-232 TRANSMITTING MODE
RS-485 TRANSMITTING MODE
INPUTS
INPUTS
OUTPUTS
OUTPUTS
SEL1 or 2 ON/OFF
D
D
Y
Z
SEL1 or 2 ON/OFF DE1 or 2
D
Y
Y
Z
0
Y
Z
0
0
0
0
0
1
1
1
1
0
0
0
1
1
1
1
1
1
1
1
1
0
1
1
0
X
0
1
0
1
1
X
1
0
1
X
1
0
1
X
X
0
1
0
0
1
0
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
RS-485 RECEIVING MODE
INPUTS
RS-232 RECEIVING MODE
INPUTS
OUTPUT
OUTPUT
SEL1 or 2 ON/OFF
B-A
R
R *
B
SEL1 or 2 ON/OFF
A
B
R
R
B
A
A
1
1
1
1
1
1
1
0
≥ -40mV
1
High-Z
High-Z
High-Z
0
0
0
0
0
0
1
1
1
1
1
0
0
0
1
1
≤ -200mV
0
1
0
1
1
0
1
0
Open or Shorted together
X
0
1
High-Z High-Z
1
1
0
1
0
1
* Internally pulled high through a 40kΩ resistor.
Open
X
Open
X
High-Z
High-Z
FN6362.0
May 27, 2008
3
ISL3332, ISL3333
TABLE 3. ISL3333 FUNCTION TABLE
RECEIVER
OUTPUTS
DRIVER
OUTPUTS
DRIVER
CHARGE DATA
RATE
(NOTE 2) (Mbps)
INPUTS
SPB
RXEN 1 DEN 1
PUMPS
SEL1 or 2 ON/OFF
SPA
or 2
or 2 DE 1 or 2
R
R
Y
Z
MODE
A
B
0
1
1
1
1
0
1
1
1
1
1
1
1
1
1
1
X
X
X
X
X
X
0
0
1
1
X
0
0
1
1
X
X
X
X
X
X
0
1
0
1
X
0
1
0
1
0
0
1
1
X
0
0
0
0
0
1
1
1
1
1
0
N.A.
ON
ON
ON
ON
High-Z High-Z
ON ON
ON
ON
0.46
0.46
0.46
0.46
N.A.
N.A.
0.46
0.115
20
RS-232
RS-232
RS-232
RS-232
Shutdown
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
0
1
N.A.
0
0
N.A.
N.A.
X
High-Z High-Z High-Z High-Z
High-Z High-Z ON ON
High-Z High-Z High-Z High-Z
ON
0
1
ON
X
X
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
1
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
0
ON
ON
ON
ON
ON
High-Z * High-Z High-Z
1
1
High-Z *
High-Z *
High-Z *
High-Z *
ON
ON
ON
ON
ON
ON
ON
ON
1
1
1
1
1
1
20
1
0
High-Z High-Z * High-Z High-Z
N.A.
0.46
0.115
20
1
1
High-Z High-Z *
High-Z High-Z *
High-Z High-Z *
High-Z High-Z *
ON
ON
ON
ON
ON
ON
ON
ON
1
1
1
1
1
1
20
NOTE:
2. Charge pumps are off if SEL1 = SEL2 = 1, or if ON/OFF = 0. If ON = 1, and either port is programmed for RS-232 mode, then the charge pumps
are on.
ISL3333 Truth Tables(FOR EACH PORT)
RS-485 TRANSMITTING MODE
RS-232 TRANSMITTING MODE
DATA
RATE
INPUTS
DE
OUTPUTS
INPUTS
OUTPUTS
SEL1 ON/
SEL1 or 2 ON/OFF DEN1 or 2
D
D
Y
1
1
0
0
Z
1
0
1
0
Y
Z
or 2 OFF 1 or 2 SPA SPB
D
Y
Z
Mbps
0.46
0.115
20
Y
0
0
0
0
0
0
1
1
1
1
1
0
1
1
1
1
0
X
0
0
1
1
1
1
1
1
1
1
1
0
1
1
1
0
X
0
0
1
X
X
0
1
0/1
0/1
0/1
X
1/0
1/0
1/0
0/1
0/1
0/1
0
1
1
X
X
1
0
1
X
X
X
X
X
High-Z High-Z N.A.
High-Z High-Z N.A.
High-Z High-Z
High-Z High-Z
X
RS-485 RECEIVING MODE
INPUTS
RS-232 RECEIVING MODE
INPUTS
OUTPUT
OUTPUT
SEL1
or 2
RXEN 1
or 2
RXEN 1
or 2
ON/OFF
B-A
R
R *
B
A
SEL1 or 2 ON/OFF
A
B
R
R
B
A
1
1
1
1
1
1
0
≥ -40mV
≤ -200mV
1
High-Z
High-Z
High-Z
0
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
1
1
0
0
1
0
0
1
1
0
0
1
0
1
0
1
0
Open or Shorted
together
0
1
1
0
1
0
1
1
1
0
1
X
X
High-Z High-Z
High-Z High-Z
0
Open
X
Open
X
X
1
High-Z High-Z
High-Z High-Z
* Internally pulled high through a 40kΩ resistor.
X
X
X
FN6362.0
May 27, 2008
4
ISL3332, ISL3333
Pin Descriptions
PIN
GND
LB
MODE
FUNCTION
BOTH Ground connection.
BOTH Enables loopback mode when low. Internally pulled-high.
BOTH No Connection.
NC
ON/OFF BOTH If either port is in RS-232 mode, a low on ON/OFF disables the charge pumps. In either mode, a low disables all the outputs,
and places the device in low power shutdown. Internally pulled-high. ON = 1 for normal operation.
RXEN
BOTH Active low receiver output enable. The corresponding port’s Rx is enabled when RXEN is low; Rx is high impedance when
RXEN is high. Internally pulled low. (QFN only)
SEL
BOTH Interface Mode Select input. High puts corresponding port in RS-485 Mode, while a low puts it in RS-232 Mode.
BOTH System power supply input (3.3V).
V
CC
V
BOTH Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply. QFN logic input pins that are externally
L
tied high in an application, should use the V supply for the high voltage level. (QFN only)
L
DEN
A
RS-232 Active high driver output enable. The corresponding port’s 232 mode drivers are enabled when DEN is high; drivers are
disabled when DEN is low. Internally pulled high. (QFN only).
RS-232 Receiver input with ±15kV ESD protection. A low on A forces R high; A high on A forces R low.
A
A
RS-485 Inverting receiver input with ±15kV ESD protection.
RS-232 Receiver input with ±15kV ESD protection. A low on B forces R high; A high on B forces R low.
B
B
B
RS-485 Noninverting receiver input with ±15kV ESD protection.
RS-232 Driver input. A low on D forces output Y high. Similarly, a high on D forces output Y low.
D
Y
Y
Y
RS-485 Driver input. A low on D forces output Y high and output Z low. Similarly, a high on D forces output Y low and output Z high.
Y
Y
D
/ DE RS-232 Driver input. A low on D forces output Z high. Similarly, a high on D forces output Z low.
Z Z
Z
RS-485 Driver output enable (DE). The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when
DE is low. Internally pulled high when port selected for RS-485 mode.
R
RS-232 Receiver output.
A
RS-485 Receiver output: If B > A by at least -40mV, R is high; If B < A by -200mV or more, R is low; R = High if A and B are
A
A
A
unconnected (floating) or shorted together (i.e., full fail-safe).
R
RS-232 Receiver output.
B
RS-485 Not used. Internally pulled-high, and unaffected by RXEN.
RS-232 Driver output with ±15kV ESD protection.
Y
RS-485 Inverting driver output with ±15kV ESD protection.
RS-232 Driver output with ±15kV ESD protection.
Z
RS-485 Noninverting driver output with ±15kV ESD protection.
RS-485 Speed control. Internally pulled-high. (QFN only)
SP
C1+
C1-
C2+
C2-
V+
RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed if both ports in RS-485 Mode.
RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed if both ports in RS-485 Mode.
RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed if both ports in RS-485 Mode.
RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed if both ports in RS-485 Mode.
RS-232 Internally generated positive RS-232 transmitter supply (+5.5V). C3 not needed if both ports in RS-485 Mode.
RS-232 Internally generated negative RS-232 transmitter supply (-5.5V). C4 not needed if both ports in RS-485 Mode.
V-
FN6362.0
May 27, 2008
5
ISL3332, ISL3333
Typical Operating Circuits
RS-232 MODE WITHOUT LOOPBACK
RS-232 MODE WITH LOOPBACK
+3.3V
C
+3.3V
+
+
+
+
+
+
0.1µF
26
0.1μF
26
1
1
3
C
0.1µF
C1+
V
CC
1
C
3
0.1µF
C1+
1
V
3
CC
+
C
0.1µF
V+
V-
3
+
V+
V-
0.1µF
2
2
C1-
C1-
28
28
C
2
0.1µF
C
2
0.1µF
C2+
C2+
15
24
C
4
15
24
C
4
27
27
4
0.1µF
C2-
C2-
0.1µF
+
+
4
R
A1
R
R
R
R
A1
A1
A1
5kΩ
5kΩ
5kΩ
25
5
5
25
B1
R
R
R
B1
B1
B1
5kΩ
RXEN1
(QFN ONLY)
22
LB
Rx
6
7
Y1
D
D
D
Y1
6
7
22
Y1
D
D
D
Y1
Z1
23
Z1
V
D
Z1
V
23
21
D
DEN1
Z1
DEN1
CC
21
20
(QFN ONLY)
V
CC
LB
CC
GND
(QFN ONLY)
LB
8
8
20
V
SEL1
SEL1
ON/OFF
CC
V
ON/OFF
CC
GND
14
GND
14
NOTE: PINOUT FOR SSOP
SAME FOR PORT 2.
NOTE: PINOUT FOR SSOP
SAME FOR PORT 2.
RS-485 MODE WITHOUT LOOPBACK
RS-485 MODE WITH LOOPBACK
+3.3V
C
+
+3.3V
C
0.1µF
26
+
0.1µF
26
1
C1+
1
V
3
1
CC
+
+
C
3
0.1µF
+
C1+
V
3
1
V+
V-
CC
0.1µF
+
+
C
3
0.1µF
2
+
V+
V-
0.1µF
C1-
2
C1-
28
C
0.1µF
2
C2+
28
C
2
0.1µF
15
24
C2+
C
4
27
15
24
C
4
27
C2-
0.1µF
C2-
+
0.1µF
+
4
5
A1
B1
4
5
A1
B1
R
R
A1
R
A1
R
RXEN1
(QFN ONLY)
LB
Rx
25
R
6
7
B1
Y1
Z1
22
25
22
D
Y1
R
D
D
6
7
B1
Y1
Y1
Z1
D
DE1
23
8
21
20
23
8
DE1
21
20
V
LB
GND
CC
V
LB
V
CC
CC
ON/OFF
V
V
SEL1
CC
CC
ON/OFF
V
CC
V
SEL1
CC
GND
14
GND
14
NOTE: PINOUT FOR SSOP
SAME FOR PORT 2.
NOTE: PINOUT FOR SSOP
SAME FOR PORT 2.
FN6362.0
May 27, 2008
6
ISL3332, ISL3333
Absolute Maximum Ratings (T = +25°C)
Thermal Information
A
V
V
to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Thermal Resistance (Typical)
θJA (°C/W) θJC (°C/W)
CC
(QFN Only) . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to V
+ 0.5V
L
CC
28 Ld SSOP Package (Note 5) . . . . . .
40 Ld QFN Package (Notes 4, 6). . . . .
60
31
N/A
2.5
Input Voltages
All Except A,B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
Input/Output Voltages
A, B (Any Mode). . . . . . . . . . . . . . . . . . . . . . . . . . . . -25V to +25V
Y, Z (Any Mode, Note 3). . . . . . . . . . . . . . . . . . . -12.5V to +12.5V
Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C
Maximum Storage Temperature Range. . . . . . . . . .-65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
R , R (non-QFN Package). . . . . . . . . . . . -0.5V to (V
+ 0.5V)
R , R (QFN Package) . . . . . . . . . . . . . . . . -0.5V to (V + 0.5V)
A
B
CC
A
B
L
Operating Conditions
Output Short Circuit Duration
Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Y, Z, R , R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
A
B
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
3. One output at a time, I
≤ 100mA for ≤ 10 mins.
OUT
4. θ is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
JA
Tech Brief TB379.
5. θ is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
JA
6. For θ , the “case temp” location is the center of the exposed metal pad on the package underside.
JC
Electrical Specifications Test Conditions: V = 3.15V to 3.45V, C1 - C4 = 0.1µF, V = V
(for QFN only); Unless Otherwise Specified.
CC
L
CC
Typicals are at V
= 3.3V, T =+25°C (Note 7)
CC
A
TEMP
MIN
MAX
PARAMETER
SYMBOL
TEST CONDITIONS
(°C) (Note 11)
TYP
(Note 11) UNITS
DC CHARACTERISTICS - RS-485 DRIVER (SEL = V
)
CC
Driver Differential V
(no load)
V
V
Full
Full
Full
Full
-
-
2.3
2
V
V
V
V
V
OUT
OUT
OD1
OD2
CC
-
Driver Differential V
(with load)
R = 50Ω (RS-422) (Figure 1)
R = 27Ω (RS-485) (Figure 1)
2
1.5
1.5
5
5
V
R
= 60Ω, R = 375Ω, V = -7V to 12V
CM
-
OD3
D
(Figure 1)
Change in Magnitude of Driver
Differential V for
ΔV
R = 27Ω or 50Ω (Figure 1)
Full
-
0.01
0.2
V
OD
OUT
Complementary Output States
Driver Common-Mode V
V
R = 27Ω or 50Ω (Figure 1)
R = 27Ω or 50Ω (Figure 1)
Full
Full
-
-
-
3.0
0.2
V
V
OUT
Change in Magnitude of Driver
Common-Mode V for
OC
ΔV
0.01
OC
OUT
Complementary Output States
Driver Short-Circuit Current,
I
-7V ≤ (V or V ) ≤ 12V (Note 8)
Full
35
-
250
mA
OS
Y
Z
V
= High or Low
OUT
Driver Three-State Output
Leakage Current (Y, Z)
I
Outputs Disabled,
= 0V or 3.6V
V
V
= 12V
= -7V
Full
Full
-
-
-
200
-
µA
µA
OZ
OUT
OUT
V
CC
-200
DC CHARACTERISTICS - RS-232 DRIVER (SEL = GND)
Driver Output Voltage Swing
V
All T
Loaded with 3kΩ to Ground
= 0V
OUT
Full
Full
±5.0
-60
-
-
-
V
O
OUTS
Driver Output Short-Circuit Current
I
V
60
mA
OS
DC CHARACTERISTICS - LOGIC PINS (i.e., DRIVER AND CONTROL INPUT PINS)
Input High Voltage
V
V
V
V
V
V
= V
if QFN
Full
Full
Full
Full
25
2.2
2
-
-
-
-
-
-
V
V
V
V
V
IH1
IH2
IH3
IH4
IH5
L
CC
2.7V ≤ V < 3.0V (QFN Only)
-
L
2.3V ≤ V < 2.7V (QFN Only)
1.6
-
-
L
1.6V ≤ V < 2.3V (QFN Only)
0.7*V
-
L
L
1.2V ≤ V < 1.6V (QFN Only)
0.7*V
L
L
FN6362.0
May 27, 2008
7
ISL3332, ISL3333
Electrical Specifications Test Conditions: V = 3.15V to 3.45V, C1 - C4 = 0.1µF, V = V (for QFN only); Unless Otherwise Specified.
CC
CC
L
Typicals are at V
= 3.3V, T =+25°C (Note 7) (Continued)
CC
A
TEMP
MIN
MAX
PARAMETER
Input Low Voltage
SYMBOL
TEST CONDITIONS
(°C) (Note 11)
TYP
(Note 11) UNITS
V
V
V
V
V
V
V
V
= V
if QFN
Full
Full
Full
Full
25
-
-
-
0.8
V
V
IL1
IL2
IL3
IL4
IL5
IL6
IN1
IN2
L
L
CC
≥ 2.7V (QFN Only)
-
0.8
2.3V ≤ V < 2.7V (QFN Only)
-
-
0.7
V
L
1.6V ≤ V < 2.3V (QFN Only)
-
-
0.35*V
V
L
L
1.3V ≤ V < 1.6V (QFN Only)
-
0.35*V
-
-
V
L
L
L
1.2V ≤ V < 1.3V (QFN Only)
25
-
0.25*V
V
L
Input Current
I
I
Pins Without Pull-ups or Pull-downs
Full
Full
-2
-25
-
-
2
µA
µA
LB, ON/OFF, DE (SP, RXEN, DEN, if QFN)
25
DC CHARACTERISTICS - RS-485 RECEIVER INPUTS (SEL = V
)
CC
Receiver Differential Threshold
Voltage
V
-7V ≤ V
≤ 12V, Full Failsafe
Full
-0.2
-
-0.04
V
TH
CM
Receiver Input Hysteresis
ΔV
V
V
= 0V
25
-
-
35
-
-
0.8
-
mV
mA
mA
kΩ
TH
CM
CC
Receiver Input Current (A, B)
I
= 0V or 3.0 to 3.6V
V
V
= 12V
= -7V
Full
Full
Full
IN
IN
IN
-0.64
15
-
Receiver Input Resistance
R
-7V ≤ V
≤ 12V, V
≤ 3.6V
= 0 (Note 9) or
CC
-
-
IN
CM
3.0V ≤ V
CC
DC CHARACTERISTICS - RS-232 RECEIVER INPUTS (SEL = GND)
Receiver Input Voltage Range
Receiver Input Threshold
V
Full
Full
Full
25
-25
-
-
25
0.8
-
V
V
IN
V
1.1
1.6
0.5
5
IL
V
2.4
-
V
IH
Receiver Input Hysteresis
Receiver Input Resistance
ΔV
-
V
TH
IN
R
V
= ±15V, V
Powered Up (Note 9)
CC
Full
3
7
kΩ
IN
DC CHARACTERISTICS - RECEIVER OUTPUTS (485 OR 232 MODE)
Receiver Output High Voltage
V
V
V
V
I
I
I
I
I
= -1.5mA (V = V
if QFN)
Full
Full
Full
Full
Full
Full
Full
V
-0.4
-
-
-
V
V
OH1
OH2
OH3
OH4
O
O
O
O
O
L
CC
CC
= -100µA, V ≥ 1.2V (QFN Only)
V -0.1
L
-
L
= -500µA, V = 1.5V (QFN Only)
1.2
1.0
-
-
-
V
L
= -150µA, V = 1.2V (QFN Only)
L
-
0.2
-
-
V
Receiver Output Low Voltage
Receiver Short-Circuit Current
V
= 5mA
0.4
85
±10
V
OL
I
0V ≤ V ≤ V
CC
7
mA
µA
OSR
O
Receiver Three-State Output
Current
I
Output Disabled, 0V ≤ V ≤ V
QFN)
(or V for
-
-
OZR
O
CC
(RS-485 Mode)
CC
L
Unused Receiver (R ) Pull-Up
B
R
ON/OFF = V , SELX = V
CC
25
-
40
-
kΩ
OBZ
Resistance
POWER SUPPLY CHARACTERISTICS
No-Load Supply Current, (Note 7)
Shutdown Supply Current
I
I
SEL1 or SEL2 = GND, LB = ON/OFF = V
Full
Full
Full
-
-
-
3.7
1.6
45
7
5
mA
mA
µA
CC232
CC485
CC
SEL 1 & 2 = LB = DE = ON/OFF = V
CC
I
I
ON/OFF = SELX = GND, LB = V
,
100
SHDN232
CC
(SPX = V DENX = GND if QFN)
L,
ON/OFF = DEX = GND, SELX SSOP
= LB = V , (SPX = GND,
Full
Full
-
-
35
60
80
µA
µA
SHDN485
CC
QFN
160
DENX = V if QFN)
L
ESD CHARACTERISTICS
Bus Pins (A, B, Y, Z) Any Mode
All Other Pins
Human Body Model
Human Body Model
Machine Model
25
25
25
-
-
-
±15
±2.5
±200
-
-
-
kV
kV
V
FN6362.0
May 27, 2008
8
ISL3332, ISL3333
Electrical Specifications Test Conditions: V = 3.15V to 3.45V, C1 - C4 = 0.1µF, V = V (for QFN only); Unless Otherwise Specified.
CC
CC
L
Typicals are at V
= 3.3V, T =+25°C (Note 7) (Continued)
CC
A
TEMP
MIN
MAX
PARAMETER
SYMBOL
TEST CONDITIONS
(°C) (Note 11)
TYP
(Note 11) UNITS
RS-232 DRIVER AND RECEIVER SWITCHING CHARACTERISTICS (SEL = GND, ALL VERSIONS AND SPEEDS)
Driver Output Transition Region
Slew Rate
SR
R
= 3kΩ, Measured From
C
C
≥ 15pF
Full
-
20
9
30
-
V/µs
V/µs
µs
L
L
3V to -3V or -3V to 3V
≤ 2500pF Full
4
L
Driver Output Transition Time
t , t
R
R
= 3kΩ, C = 2500pF, 10% - 90%
Full
Full
Full
Full
25
0.22
1.2
1
3.1
2
r
f
L
L
L
Driver Propagation Delay
t
t
= 3kΩ, C = 1000pF (Figure 6)
-
-
-
-
-
µs
DPHL
DPLH
L
1.2
300
1500
500
2
µs
Driver Propagation Delay Skew
Driver Enable Time (QFN Only)
Driver Disable Time (QFN Only)
t
t
- t
DPHL DPLH
(Figure 6)
450
-
ns
DSKEW
t
C = 1000pF
ns
DEN
L
t
R
= 5kΩ, Measured at V
L OUT
= ±3V,
25
-
ns
DDIS
C = 30pF
L
Driver Enable Time from Shutdown
Driver Maximum Data Rate
t
V
= ±3.0V, C = 1000pF
25
-
25
-
-
µs
DENSD
DR
OUT
L
R
= 3kΩ, C = 500pF, One Transmitter
Full
250
400
kbps
D
L
L
Switching on Each Port
Receiver Propagation Delay
t
t
C = 15pF (Figure 7)
Full
Full
Full
Full
Full
Full
Full
Full
25
-
40
58
18
2
120
ns
ns
RPHL
RPLH
L
-
120
Receiver Propagation Delay Skew
Receiver Maximum Data Rate
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Output Low
Receiver Disable from Output High
t
t
- t
RPHL RPLH
(Figure 7)
-
40
-
ns
RSKEW
DR
C = 15pF
0.46
Mbps
ns
R
L
t
QFN Only, C = 15pF, SW = V
CC
-
-
-
-
-
18
18
22
22
60
-
ZL
L
t
QFN Only, C = 15pF, SW = GND
-
ns
ZH
L
t
QFN Only, C = 15pF, SW = V
CC
-
ns
LZ
L
t
QFN Only, C = 15pF, SW = GND
-
ns
HZ
L
Receiver Enable from Shutdown to
Output Low
t
C
= 15pF, SW = V
-
ns
ZLSHDN
L
CC
Receiver Enable from Shutdown to
Output High
t
C
= 15pF, SW = GND
25
-
20
-
ns
ns
ZHSHDN
L
RS-485 DRIVER SWITCHING CHARACTERISTICS (FAST DATA RATE (20Mbps), SEL = V , ALL VERSIONS (SPA = V
CC
if QFN))
CC
Driver Differential Input to Output
Delay
t
, t
DLH DHL
R
= 54Ω, C = 100pF (Figure 2)
Full
10
20
35
DIFF
L
Driver Output Skew
t
R
R
C
C
C
C
R
= 54Ω, C = 100pF (Figure 2)
Full
-
3
-
2
20
28
35
30
30
100
10
30
ns
ns
ns
ns
ns
ns
ns
SKEW
t , t
DIFF
DIFF
L
Driver Differential Rise or Fall Time
Driver Enable to Output Low
Driver Enable to Output High
Driver Disable from Output Low
Driver Disable from Output High
= 54Ω, C = 100pF, (Figure 2)
Full
R
F
L
t
= 100pF, SW = V
(Figure 3)
Full
60
ZL
L
L
L
L
L
CC
= 100pF, SW = GND (Figure 3)
= 15pF, SW = V (Figure 3)
t
t
Full
Full
-
60
ZH
t
-
60
LZ
CC
= 15pF, SW = GND (Figure 3)
= 500Ω, C = 100pF, SW = V
Full
-
60
HZ
Driver Enable from Shutdown to
Output Low
t
(Figure 3) Full
-
250
ZL(SHDN)
L
CC
Driver Enable from Shutdown to
Output High
t
R = 500Ω, C = 100pF, SW = GND (Figure 3) Full
-
290
35
375
-
ns
ZH(SHDN)
L
L
Driver Maximum Data Rate
f
R
= 54Ω, C = 100pF (Figure 2)
Full
20
Mbps
MAX
DIFF
L
RS-485 DRIVER SWITCHING CHARACTERISTICS (MEDIUM DATA RATE (460kbps, QFN ONLY), SEL = V , SPA = SPB= GND)
CC
Driver Differential Input to Output
Delay
t
, t
DLH DHL
R
= 54Ω, C = 100pF (Figure 2)
Full
200
500
1000
ns
DIFF
L
Driver Output Skew
t
R
R
C
= 54Ω, C = 100pF (Figure 2)
Full
Full
Full
-
300
-
10
660
42
150
1100
100
ns
ns
ns
SKEW
t , t
DIFF
DIFF
L
Driver Differential Rise or Fall Time
Driver Enable to Output Low
= 54Ω, C = 100pF (Figure 2)
L
R
F
t
= 100pF, SW = V
(Figure 3)
CC
ZL
L
FN6362.0
May 27, 2008
9
ISL3332, ISL3333
Electrical Specifications Test Conditions: V = 3.15V to 3.45V, C1 - C4 = 0.1µF, V = V (for QFN only); Unless Otherwise Specified.
CC
CC
L
Typicals are at V
= 3.3V, T =+25°C (Note 7) (Continued)
CC
A
TEMP
MIN
MAX
PARAMETER
SYMBOL
TEST CONDITIONS
(°C) (Note 11)
TYP
350
30
(Note 11) UNITS
Driver Enable to Output High
Driver Disable from Output Low
Driver Disable from Output High
t
C
C
C
R
= 100pF, SW = GND (Figure 3)
Full
Full
-
-
-
-
450
60
ns
ns
ns
ns
ZH
L
L
L
L
t
= 15pF, SW = V
(Figure 3)
LZ
CC
= 15pF, SW = GND (Figure 3)
= 500Ω, C = 100pF, SW = V
t
Full
30
60
HZ
Driver Enable from Shutdown to
Output Low
t
(Figure 3) Full
-
500
ZL(SHDN)
L
CC
Driver Enable from Shutdown to
Output High
t
R = 500Ω, C = 100pF, SW = GND (Figure 3) Full
-
-
750
-
ns
ZH(SHDN)
L
L
Driver Maximum Data Rate
f
R
= 54Ω, C = 100pF (Figure 2)
Full
460
2000
kbps
MAX
DIFF
L
RS-485 DRIVER SWITCHING CHARACTERISTICS (SLOW DATA RATE (115kbps, QFN ONLY), SEL = V , SPA = GND, SPB= V
CC CC
)
Driver Differential Input to Output
Delay
t
, t
DLH DHL
R
= 54Ω, C = 100pF (Figure2)
Full
800
1600
2500
ns
DIFF
L
Driver Output Skew
t
R
R
C
C
C
C
R
= 54Ω, C = 100pF (Figure2)
Full
-
250
1700
45
500
3100
100
1200
60
ns
ns
ns
ns
ns
ns
ns
SKEW
t , t
DIFF
DIFF
L
Driver Differential Rise or Fall Time
Driver Enable to Output Low
Driver Enable to Output High
Driver Disable from Output Low
Driver Disable from Output High
= 54Ω, C = 100pF (Figure 2)
Full
1000
R
F
L
t
= 100pF, SW = V
(Figure 3)
Full
-
-
-
-
-
ZL
L
L
L
L
L
CC
= 100pF, SW = GND (Figure 3)
= 15pF, SW = V (Figure 3)
t
t
Full
Full
900
35
ZH
t
LZ
CC
= 15pF, SW = GND (Figure 3)
= 500Ω, C = 100pF, SW = V
Full
25
60
HZ
Driver Enable from Shutdown to
Output Low
t
(Figure 3) Full
-
800
ZL(SHDN)
L
CC
Driver Enable from Shutdown to
Output High
t
R = 500Ω, C = 100pF, SW = GND (Figure 3) Full
-
-
1500
-
ns
ZH(SHDN)
L
L
Driver Maximum Data Rate
f
R
= 54Ω, C = 100pF (Figure 2)
Full
115
800
kbps
MAX
DIFF
L
RS-485 RECEIVER SWITCHING CHARACTERISTICS (SEL = V , ALL VERSIONS AND SPEEDS)
CC
Receiver Input to Output Delay
Receiver Skew | t - t
t
, t
PLH PHL
(Figure 4)
(Figure 4)
Full
Full
Full
Full
Full
Full
Full
Full
20
-
45
3
70
10
-
ns
ns
|
t
SKEW
PLH PHL
Receiver Maximum Data Rate
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Output Low
Receiver Disable from Output High
f
20
-
40
20
20
20
20
500
Mbps
ns
MAX
t
QFN Only, C = 15pF, SW = V
(Figure 5)
QFN Only, C = 15pF, SW = GND (Figure5)
60
60
60
60
900
ZL
L
CC
t
t
-
ns
ZH
L
t
QFN Only, C = 15pF, SW = V
(Figure 5)
QFN Only, C = 15pF, SW = GND (Figure 5)
-
ns
LZ
L
CC
-
ns
HZ
L
Receiver Enable from Shutdown to
Output Low
t
C
= 15pF, SW = V
(Figure 5)
-
ns
ZLSHDN
L
CC
Receiver Enable from Shutdown to
Output High
t
C
= 15pF, SW = GND (Figure 5)
Full
-
500
900
ns
ZHSHDN
L
NOTES:
7. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless
otherwise specified.
8. Supply current specification is valid for loaded drivers when DE = 0V (RS-485 mode) or DEN = 0V (RS-232 mode).
9. Applies to peak current. See “Typical Performance Curves” for more information.
10. R defaults to RS-485 mode (>15kΩ) when the device is unpowered (V
IN
= 0V), or in SHDN, regardless of the state of the SEL inputs.
CC
11. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested.
FN6362.0
May 27, 2008
10
ISL3332, ISL3333
Test Circuits and Waveforms
R
R
DE
V
CC
Y
D
Y
V
R
D
D
OD
Z
V
OC
FIGURE 1. RS-485 DRIVER V
AND V
TEST CIRCUIT
OC
OD
3V
0V
D
1.5V
1.5V
PHL
Y
C
= 100pF
= 100pF
L
DE
t
t
PLH
V
CC
V
Y
Z
OH
D
Y
50%
50%
50%
50%
R
OUT (Z)
OUT (Y)
DIFF
D
V
C
OL
L
t
t
SIGNAL
GENERATOR
PHL
PLH
V
OH
V
OL
t
t
DLH
DHL
+V
OD
90%
10%
90%
10%
t
DIFF OUT (Z - Y)
0V
0V
-V
OD
t
R
F
SKEW = |t
(Y or Z) - t
(Z or Y)|
PHL
PLH
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. RS-485 DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
FN6362.0
May 27, 2008
11
ISL3332, ISL3333
Test Circuits and Waveforms (Continued)
DE
ENABLED
1.5V
Y
Z
500Ω
V
DY
3V
0V
CC
DE
(ON/OFF FOR SHDN)
D
1.5V
HZ
GND
SW
SIGNAL
GENERATOR
C
L
t
ZH
ZH(SHDN)
t
t
OUTPUT HIGH
2.3V
V
OH
V
- 0.5V
OH
OUT (Y, Z)
FOR SHDN TESTS, SWITCH ON/OFF RATHER THAN DE
0V
PARAMETER ON/DE OUTPUT
DY
0/1
1/0
0/1
1/0
0/1
1/0
SW
C
(pF)
L
t
1/-
1/-
1/-
1/-
-/1
-/1
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
GND
15
15
t
HZ
t
ZL
LZ
t
ZL(SHDN)
t
V
CC
GND
LZ
V
CC
t
100
100
100
100
OUT (Y, Z)
ZH
2.3V
V
OL
+ 0.5V
V
t
V
ZL
ZH(SHDN)
CC
OL
OUTPUT LOW
t
GND
t
V
CC
ZL(SHDN)
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3A. TEST CIRCUIT
FIGURE 3. RS-485 DRIVER ENABLE AND DISABLE TIMES
RXEN (QFN ONLY)
A
+1.5V
-1.5V
15pF
B
0V
0V
0V
R
A
R
B
t
PLH
t
PHL
V
CC
SIGNAL
GENERATOR
R
A
1.5V
1.5V
0V
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4A. TEST CIRCUIT
FIGURE 4. RS-485 RECEIVER PROPAGATION DELAY
3V
RXEN (QFN ONLY)
ON/OFF
1.5V
ENABLED
1.5V
A
(FOR SHDN TESTS)
1kΩ
V
R
CC
A
0V
3V
R
GND
SW
SIGNAL
B
GENERATOR
15pF
RXEN (QFN ONLY)
1.5V
HZ
0V
t
ZH
t
FOR SHDN TESTS, SWITCH ON/OFF RATHER THAN RXEN
t
ZH(SHDN)
OUTPUT HIGH
V
OH
PARAMETER
ON/RXEN
B
SW
GND
V
- 0.5V
OH
R
A
1.5V
t
t
(QFN Only)
(QFN Only)
(QFN Only)
(QFN Only)
1/-
1/-
1/-
1/-
-/0
-/0
+1.5V
-1.5V
+1.5V
-1.5V
+1.5V
-1.5V
HZ
0V
t
V
CC
LZ
t
GND
t
LZ
ZL
ZH
t
ZL(SHDN)
V
t
V
CC
OL
ZL
t
CC
R
A
GND
1.5V
ZH(SHDN)
V
+ 0.5V
OL
V
t
V
CC
ZL(SHDN)
OUTPUT LOW
FIGURE 5A. TEST CIRCUIT
FIGURE 5. RS-485 RECEIVER ENABLE AND DISABLE TIMES
FIGURE 5B. MEASUREMENT POINTS
FN6362.0
May 27, 2008
12
ISL3332, ISL3333
Test Circuits and Waveforms (Continued)
3V
DEN (QFN ONLY)
D
V
1.5V
1.5V
Y,Z
CC
C
L
0V
D
Y,Z
Y, Z
D
t
t
DPHL
DPLH
V
R
O+
L
SIGNAL
GENERATOR
OUT (Y,Z)
0V
0V
V
O-
SKEW = |t |
- t
DPHL DPLH
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RS-232 DRIVER PROPAGATION DELAY AND TRANSITION TIMES
FIGURE 6A. TEST CIRCUIT
3V
0V
RXEN (QFN ONLY)
A, B
50%
50%
C
= 15pF
L
R
R
B
A, B
A,
R
t
t
RPLH
RPHL
V
OH
SIGNAL
GENERATOR
R
R
B
A,
50%
50%
V
OL
SKEW = |t
- t
|
RPHL RPLH
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7A. TEST CIRCUIT
FIGURE 7. RS-232 RECEIVER PROPAGATION DELAY AND TRANSITION TIMES
FN6362.0
May 27, 2008
13
ISL3332, ISL3333
Detailed Description
Typical Application
Each of the two ISL333X ports supports dual protocols:
RS-485/422, and RS-232. RS-485 and RS-422 are differential
(balanced) data transmission standards for use in high speed
(up to 20Mbps) networks, or long haul and noisy
RS-232 to RS-485 Converter
The ISL3332, ISL3333 are ideal for implementing a single IC
2-wire (Tx Data, Rx Data) protocol converter, because each
port can be programmed for a different protocol. Figure 8
illustrates the simple connections to create a single
transceiver RS-232 to RS-485 converter. Depending on the
RS-232 data rate, using an RS-422 bus as an RS-232
“extension cord” can extend the transmission distance up to
4000’ (1220m). A similar circuit on the other end of the cable
completes the conversion to/from RS-232.
environments. The differential signaling, coupled with
RS-485’s requirement for an extended common mode range
(CMR) of +12V to -7V make these transceivers extremely
tolerant of ground potential differences, as well as voltages
induced in the cable by external fields. Both of these effects
are real concerns when communicating over the RS-485/422
maximum distance of 4000’ (1220m). It is important to note
that the ISL333X don’t follow the RS-485 convention
whereby the inverting I/O is labeled “B/Z”, and the non
inverting I/O is “A/Y”. Thus, in the application diagrams
below the 333X A/Y (B/Z) pins connect to the B/Z (A/Y)
pins of the generic RS-485/RS-422 ICs.
+3.3V
+
0.1µF
26
1
C
C1+
V
3
1
CC
C
+
+
3
V+
V-
0.1µF
2
0.1µF
C1-
28
C
2
C2+
+
15
24
0.1µF
C
4
27
4
C2-
0.1µF
+
R
A1
A1
RS-422 is typically a point-to-point (one driver talking to one
receiver on a bus), or a point-to-multipoint (multidrop)
standard that allows only one driver and up to 10 receivers
on each bus. Because of the one driver per bus limitation,
RS-422 networks use a two bus, full duplex structure for
bidirectional communication, and the Rx inputs and Tx
outputs (no tri-state required) connect to different busses, as
shown in Figure 10.
NC
NC
R
5kΩ
TxD
RS-232 IN
R
B1
5
B1 25
R
5kΩ
D
D
Y1
Z1
6
7
Y1
Z1
22
23
NC
D
RxD
RS-232 OUT
D
8
9
SEL1
SEL2
Conversely, RS-485 is a true multipoint standard, which
allows up to 32 devices (any combination of drivers- must be
tri-statable - and receivers) on each bus. Now bidirectional
communication takes place on a single bus, so the Rx inputs
and Tx outputs of a port connect to the same bus lines, as
shown in Figure 9. Each port set to RS-485 /422 mode
includes one Rx and one Tx.RS-232 is a point-to-point,
singled ended (signal voltages referenced to GND)
communication protocol targeting fairly short (<150’, 46m)
and low data rate (<1Mbps) applications. Each port contains
two transceivers (2 Tx and 2 Rx) in RS-232 mode. Protocol
selection is handled via a logic pin (SELX) for each port.
20
17
V
ON/OFF
V
CC
CC
A2
13
R
A2
RS-485 IN
R
12 B2
11 Y2
D
Y2
19
18
RS-485 OUT
10
D
Z2
DE2
V
CC
GND
14
NOTE: PINOUT FOR SSOP
FIGURE 8. SINGLE IC RS-232 TO RS-485 CONVERTER
GENERIC 1/2 DUPLEX 485 XCVR
RO RE
DE
DI
GENERIC 1/2 DUPLEX 485 XCVR
+5V
+3.3V
0.1µF
D
ISL333X
R
+
+
R
0.1µF
0.1µF
V
V
CC
CC
GND
V
+5V
CC
RO
RE
RA
B
A
R
B/Z
RXEN *
Tx/Rx
A/Y
DE
DI
DE
DY
Y
B/Z
A/Y
D
D
Z
R
T
GND
GND
R
T
* QFN ONLY
FIGURE 9. TYPICAL HALF DUPLEX RS-485 NETWORK
FN6362.0
May 27, 2008
14
ISL3332, ISL3333
GENERIC 422 Rx (SLAVE)
RO RE
GENERIC FULL DUPLEX 422 XCVR (SLAVE)
+5V
0.1µF
+3.3V
R
+
+
ISL333X (MASTER)
0.1µF
0.1µF
GND
V
+5V
CC
A
B
1kΩ
OR NC
V
CC
V
R
T
CC
Z
RO
DI
A
B
D
R
DY
Y
DE
Z
Y
R
A
T
R
D
B
RA
GND
GND
FIGURE 10. TYPICAL RS-422 NETWORK
.
ON/OFF pin, or via the active low RXEN pins available on
the QFN package option (see “ISL3333 Special Features” for
more details).
ISL333x Advantages
These dual protocol ICs offer many parametric
improvements vs those offered on competing dual protocol
devices. Some of the major improvements are:
Tx Features
RS-232 drivers invert and convert the standard TTL/CMOS
levels from a UART, or µcontroller serial port to RS-232
compliant levels (±5V minimum). The Tx delivers these
compliant output levels even at data rates of 400kbps, with
loads of 500pF, and with one output in each port switching at
this high rate. The drivers are designed for low skew
(typically 12% of the 400kbps bit width), and are compliant to
the RS-232 slew rate spec (4 to 30V/μs) for a wide range of
load capacitances. Tx inputs float if left unconnected, and
• 3.3V Supply Voltage - Eliminates the 5V supply that
powers just the interface IC
• 15kV Bus Pin ESD - Eases board level requirements
• Full Failsafe RS-485 Rx - Eliminates bus biasing
• Selectable RS-485 Data Rate - Up to 20Mbps, or slew
rate limited for low EMI and fewer termination issues
• High RS-232 Data Rate - >250kbps
may cause I
unused inputs to GND.
increases. For the best results, connect
CC
• Lower Tx and Rx Skews - Wider, consistent bit widths
• Lower I
CC
- Max I is 2x to -4x lower than competition
CC
Tx outputs are short circuit protected, and incorporate a
thermal SHDN feature to protect the IC in situations of
severe power dissipation - see the RS-485 section for more
details. All drivers disable in SHDN, or when the 3.3V power
supply is off, and a port’s drivers also disable via the
corresponding DENX pin (see “ISL3333 Special Features”
for more details) available on the QFN package option (see
Tables 2 and 3 and the “Low Power Shutdown” section). The
ISL3332’s SHDN function is useful for disabling the outputs if
both ports will always be disabled together (e.g., used as a
four transceiver RS-232 port), and if it is acceptable for the
Rx to be disabled as well.
• Flow-Thru Pinouts - Tx, Rx bus pins on one side/logic
pins on the other, for easy routing to connector/UART
Packaging - Smaller (QFN) and Pb-free.
RS-232 Mode
Rx Features
RS-232 receivers invert and convert RS-232 input levels
(±3V to ±25V) to the standard TTL/CMOS levels required by
a UART, ASIC, or µcontroller serial port. Receivers are
designed to operate at faster data rates than the drivers, and
they feature very low skews (18ns) so the receivers
Charge Pumps
contribute negligibly to bit width distortion. Inputs include the
standards required 3kΩ to 7kΩ pull-down resistor, so unused
inputs may be left unconnected. Rx inputs also have built-in
hysteresis to increase noise immunity, and to decrease
erroneous triggering due to slowly transitioning input signals.
The on-chip charge pumps create the RS-232 transmitter
power supplies (typically +5.7/-5.3V) from a single supply as
low as 3.15V, and are enabled only if either port is
configured for RS-232 operation. The efficient design
requires only four small 0.1μF capacitors for the voltage
doubler and inverter functions. By operating discontinuously
(i.e., turning off as soon as V+ and V- pump up to the
Rx outputs are short circuit protected, and are only
tristatable when the entire IC is shutdown (SHDN) via the
FN6362.0
May 27, 2008
15
ISL3332, ISL3333
nominal values), the charge pump contribution to RS-232
mode I is reduced significantly. Unlike competing devices
the Rx upper switching point at -40mV, thereby ensuring that
the Rx recognizes a 0V differential as a high level.
CC
that require the charge pump in RS-485 mode, disabling the
charge pump saves power, and minimizes noise. If the
application keeps both ports in RS-485 mode (e.g., a
dedicated dual channel RS-485 interface), then the charge
pump capacitors aren’t even required.
All the Rx outputs are short circuit protected, and are tri-state
when the IC is forced into SHDN, but ISL3332 (SSOP)
receiver outputs are not independently tri-statable. ISL3333
(QFN) receiver outputs are tri-statable via an active low
RXEN input for each port (see “ISL3333 Special Features”
for more details).
Data Rates and Cabling
Drivers operate at data rates up to 400kbps, and are
guaranteed for data rates up to 250kbps. The charge pumps
and drivers are designed such that one driver in each port
can be operated at the rated load, and at 250kbps (see
Figure 34). Figure 34 also shows that drivers can easily drive
two to three thousand picofarads at data rates up to
250kbps, while still delivering compliant ±5V output levels.
Tx Features
The RS-485/RS-422 driver is a differential output device that
delivers at least 1.5V across a 54Ω load (RS-485), and at
least 2V across a 100Ω load (RS-422). The drivers feature
low propagation delay skew to maximize bit widths, and to
minimize EMI.
To allow multiple drivers on a bus, the RS-485 spec requires
that drivers survive worst case bus contentions undamaged.
The ISL333X drivers meet this requirement via driver output
short circuit current limits, and on-chip thermal shutdown
circuitry. The output stages incorporate current limiting
circuitry that ensures that the output current never exceeds
the RS-485 spec, even at the common mode voltage range
extremes of 12V and -7V. In the event of a major short circuit
condition, devices also include a thermal shutdown feature
that disables the drivers whenever the die temperature
becomes excessive. This eliminates the power dissipation,
allowing the die to cool. The drivers automatically re-enable
after the die temperature drops about 15 degrees. If the
contention persists, the thermal shutdown/re-enable cycle
repeats until the fault is cleared. Receivers stay operational
during thermal shutdown.
Receivers operate at data rates up to 2Mbps. They are
designed for a higher data rate to facilitate faster factory
downloading of software into the final product, thereby
improving the user’s manufacturing throughput.
Figures 37 and 38 illustrate driver and receiver waveforms at
250kbps, and 500kbps, respectively. For these graphs, one
driver of each port drives the specified capacitive load, and a
receiver in the port.
RS-232 doesn’t require anything special for cabling; just a
single bus wire per transmitter and receiver, and another
wire for GND. So an ISL333X RS-232 port uses a five
conductor cable for interconnection. Bus terminations are
not required, nor allowed, by the RS-232 standard.
RS-485 multi-driver operation also requires drivers to include
tri-state functionality, so each port has a DE pin to control
this function. If the driver is used in an RS-422 network, such
that driver tri-state isn’t required, then the DE pin can be left
unconnected and an internal pull-up keeps it in the enabled
state. Drivers are also tri-stated when the IC is in SHDN, or
when the 3.3V power supply is off.
RS-485 Mode
Rx Features
RS-485 receivers convert differential input signals as small
as 200mV, as required by the RS-485 and RS-422
standards, to TTL/CMOS output levels. The differential Rx
provides maximum sensitivity, noise immunity, and common
mode rejection. Per the RS-485 standard, receiver inputs
function with common mode voltages as great as +12V and
-7V, regardless of supply voltage, making them ideal for long
networks where induced voltages are a realistic concern.
Each RS-485/RS-422 port includes a single receiver (RA),
and the unused Rx output (RB) is disabled but pulled high by
an internal current source. The internal current source turns
off in SHDN.
Speed Options
The ISL3332 (SSOP) has fixed, high slew rate driver outputs
optimized for 20Mbps data rates. The ISL3333 (QFN) offers
three user selectable data rate options: “Fast” for high slew
rate and 20Mbps; “Medium” with slew rate limiting set for
460kbps; “Slow” with even more slew rate limiting for
115kbps operation. See the “Data Rate“ and “Slew Rate
Limited Data Rates” sections for more information.
Worst case receiver input currents are 20% lower than the 1
“unit load” (1mA) RS-485 limit, which translates to a 15kΩ
minimum input resistance.
Receiver performance is the same for all three speed
options.
Data Rate, Cables, and Terminations
These receivers include a “full fail-safe” function that
guarantees a high level receiver output if the receiver inputs
are unconnected (floating), shorted together, or if the bus is
terminated but undriven (i.e., differential voltage collapses to
near zero due to termination). Failsafe with shorted, or
terminated and undriven inputs is accomplished by setting
RS-485/RS-422 are intended for network lengths up to 4000’
(1220m), but the maximum system data rate decreases as
the transmission length increases. Devices operating at the
maximum data rate of 20Mbps are limited to maximum
lengths of 20-100’ (6-31m), while devices operating at or
FN6362.0
May 27, 2008
16
ISL3332, ISL3333
below 115kbps can operate at the maximum length of 4000’
High ESD
(1220m).
All pins on the ISL333X include ESD protection structures
rated at ±2.5kV (HBM), which is good enough to survive
ESD events commonly seen during manufacturing. But the
bus pins (Tx outputs and Rx inputs) are particularly
vulnerable to ESD events because they connect to an
exposed port on the exterior of the finished product. Simply
touching the port pins, or connecting a cable, can destroy an
unprotected port. ISL333X bus pins are fitted with advanced
structures that deliver ESD protection in excess of ±15kV
(HBM), without interfering with any signal in the RS-485 or
the RS-232 range. This high level of protection may
Higher data rates require faster edges, so both the ISL333X
versions offer an edge rate capable of 20Mbps data rates.
The ISL3333 also offers two slew rate limited edge rates to
minimize problems at slower data rates. Nevertheless, for
the best jitter performance when driving long cables, the
faster speed settings may be preferable, even at low data
rates. See the “RS-485 Slew Rate Limited Data Rates”
section for details.
Twisted pair is the cable of choice for RS-485/RS-422
networks. Twisted pair cables tend to pick up noise and
other electromagnetically induced voltages as common
mode signals, which are effectively rejected by the
differential receivers in these ICs.
eliminate the need for board level protection, or at the very
least will increase the robustness of any board level scheme.
Small Packages
Competing 3.3V dual protocol ICs are available only in a 28
Ld SSOP. The ISL3333’s tiny 6x6mm QFN footprint is 80%
smaller than the competing SSOP.
The preferred cable connection technique is “daisy-
chaining”, where the cable runs from the connector of one
device directly to the connector of the next device, such that
cable stub lengths are negligible. A “backbone” structure,
where stubs run from the main backbone cable to each
device’s connector, is the next best choice, but care must be
taken to ensure that each stub is electrically “short”. See
Table 4 for recommended maximum stub lengths for each
speed option.
Flow Through Pinouts
Even the ISL333X pinouts are features, in that the true
flow-through design simplifies board layout. Having the bus
pins all on one side of the package for easy routing to a
cable connector, and the Rx outputs and Tx inputs (logic
pins) on the other side for easy connection to a UART,
avoids costly and problematic crossovers. Competing “flow
through” pinouts mix logic and bus pin inputs on one side of
the package, and logic and bus pin outputs on the other side.
This forces the designer to route four traces from the right
side of the IC around the IC to the cable connector. Figure 11
illustrates the flow-through nature of the ISL333X’s pinout.
TABLE 4. RECOMMENDED STUB LENGTHS
MAXIMUM STUB LENGTH
SPEED OPTION
SLOW
ft (m)
350-500 (107-152)
100-150 (30.5 - 46)
1-3 (0.3 - 0.9)
MED
FAST
ISL3332
Proper termination is imperative to minimize reflections
when using the 20Mbps speed option. Short networks using
the medium and slow speed options need not be terminated,
but terminations are recommended unless power dissipation
is an overriding concern. Note that the RS-485 spec allows a
maximum of two terminations on a network, otherwise the Tx
A1
B1
UART
R
RA1
DY1
OR
ASIC
Y1
Z1
D
OR
Z2
Y2
DY2
RA2
µCONTROLLER
output voltage may not meet the required V
.
OD
B2
A2
In point-to-point, or point-to-multipoint (RS-422) networks,
the main cable should be terminated in its characteristic
impedance (typically 120Ω) at the end farthest from the
driver. In multi-receiver applications, stubs connecting
receivers to the main cable should be kept as short as
possible, but definitely shorter than the limits shown in Table
4. Multipoint (RS-485) systems require that the main cable
be terminated in its characteristic impedance at both ends.
Again, keep stubs connecting a transceiver to the main
cable as short as possible, and refer to Table 4. Avoid “star”,
and other configurations, where there are many “ends”
which would require more than the two allowed terminations
to prevent reflections.
FIGURE 11. ILLUSTRATION OF FLOW THROUGH PINOUT
Low Power Shutdown (SHDN) Mode
The ON/OFF pin is driven low to place the IC (both ports) in
the SHDN mode, and the already low supply current drops to
as low as 21μA. If this functionality isn’t desired, the pin can
be left disconnected (thanks to the internal pull-up), or it
should be connected to V
1kΩ resistor. SHDN disables the Tx and Rx outputs, and
(V for the QFN), through a
CC
L
disables the charge pumps if either port is in RS-232 mode,
so V+ collapses to V , and V- collapses to GND.
CC
FN6362.0
May 27, 2008
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ISL3332, ISL3333
All but 10uA of SHDN supply current (I
CC
plus I ) is due to
L
V
= +3.3V
V
= +2V
CC
CC
control input (ON, LB, SP, DE, DEN) pull-up resistors
(~11μA/resistor), so SHDN supply current varies depending
on the ISL333X configuration. The spec tables indicate the
SHDN currents for configurations that optimize these
currents. For example, in RS-232 mode the SP pins aren’t
used, so if both ports are configured for RS-232, floating or
tying the SP pins high minimizes SHDN current. Likewise in
RS-485 mode, the drivers are disabled in SHDN, so driving
the DE and DEN pins high during this time also reduces the
supply current.
ESD
DIODE
V
= 3.3V
R
T
OH
XD
R
A
V
≥ 2
IH
D
XD
Y
V
≤ 2
OH
GND
GND
When enabling from SHDN in RS-232 mode, allow at least
25μs for the charge pumps to stabilize before transmitting
data. The charge pumps aren’t used in RS-485 mode, so the
transceiver is ready to send or receive data in less than 2µs,
which is much faster than competing devices that require the
charge pump for all modes of operation.
ISL3332
= +3.3V
UART/PROCESSOR
= +2V
V
V
CC
CC
V
L
ESD
V
= 2V
DIODE
R
T
OH
XD
R
A
Internal Loopback Mode
Driving the LB pin low places both ports in the loopback
mode, a mode that facilitates implementing board level self
test functions. In loopback, internal switches disconnect the
Rx inputs from the Rx outputs, and feed back the Tx outputs
to the appropriate Rx output. This way the data driven at the
Tx input appears at the corresponding Rx output (refer to
“Typical Operating Circuits” on page 6”). The Tx outputs
remain connected to their terminals, so the external loads
are reflected in the loopback performance. This allows the
loopback function to potentially detect some common bus
faults such as one or both driver outputs shorted to GND, or
outputs shorted together.
V
= 1V
IH
D
XD
Y
V
≤ 2
OH
GND
GND
ISL3333
UART/PROCESSOR
FIGURE 12. USING V PIN TO ADJUST LOGIC LEVELS
L
with the logic device output levels. Tailoring the logic pin
input switching points and output levels to the supply voltage
of the UART, ASIC, or μcontroller eliminates the need for a
level shifter/translator between the two ICs.
V can be anywhere from V
down to 1.2V, but the input
CC
Note that the loopback mode uses an additional set of
receivers, as shown in the “Typical Operating Circuits”.
These loopback receivers are not standards compliant, so
the loopback mode can’t be used to implement a half-duplex
RS-485 transceiver.
L
switching points may not provide enough noise margin when
V < 1.5V. Table 5 indicates typical V and V values for
L
IH
IL
various V voltages so the user can ascertain whether or not
L
a particular V voltage meets his needs.
L
TABLE 5. V AND V vs. V FOR V
IH IL
= 3.3V
CC
L
If loopback won’t be utilized, the pin can be left disconnected
(thanks to the internal pull-up), or it should be connected to
V
(V)
V
(V)
V
(V)
IL
L
IH
V
(V for the QFN), through a 1kΩ resistor.
L
CC
1.2
1.5
1.8
2.3
2.7
3.3
0.85
0.9
0.9
1.2
1.4
1.8
0.26
0.5
ISL3333 (QFN Package) Special Features
0.73
1.0
Logic Supply (V Pin)
L
The ISL3333 (QFN) includes a V pin that powers the logic
L
inputs (Tx inputs and control pins) and Rx outputs. These
pins interface with “logic” devices such as UARTs, ASICs,
and μcontrollers, and today most of these devices use power
supplies significantly lower than 3.3V. Thus, a 3.3V output
level from a 3.3V powered dual protocol IC might seriously
overdrive and damage the logic device input. Similarly, the
1.3
1.7
Note: With V ≤ 1.6V, the ISL3333 may not operate at the full
L
data rate unless the logic signal V is at least 0.2V below
IL
the typical value listed in Table 5.
logic device’s low V
might not exceed the V of a 3.3V
OH
IH
powered dual protocol input. Connecting the V pin to the
power supply of the logic device (Figure 12) limits the
L
The V supply current (I ) is typically less than 80μA, even in
the worst case configuration, as shown in Figures 20 and 21.
L
L
ISL3333’s Rx output V
to V (Figure 15), and reduces the
OH
L
With the Rx outputs unloaded, all of the DC V current is due
L
Tx and control input switching points to values compatible
to inputs with internal pull-up resistors (DE, DEN, SP, LB,
FN6362.0
May 27, 2008
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ISL3332, ISL3333
ON/OFF) being driven to the low input state. The worst case
+3.3V
I current occurs during SHDN (see Figure 21), due to the I
through the ON/OFF pin pull-up resistor when that pin is
ISL3330
R
L
L
+
0.1µF
V
CC
driven low. I through an input pull-up resistor is ~11µA (6µA
IL
RA
B
for DE1 and DE2), so the I in Figure 20 drops by about
L
A
RXEN
22µA (at V = 3.3V) when the two SP inputs are high versus
L
Tx/Rx
low (next to bottom vs. top curve). SHDN I is lowest in the
RS-232 mode, because only the DEN pins and/or the
ON/OFF pin should be driven low. When all the inputs with
L
DEN
DY
Y
D
Z
GND
pull-downs are driven high, I drops to <<1µA (see Figure
L
20), so to minimize power dissipation drive these inputs high
when unneeded (e.g., SP inputs aren’t used in RS-232
mode, and DEN inputs aren’t used in RS-485 mode, so drive
them high in those modes).
ACTIVE HIGH RX ENABLE
ISL3333
+3.3V
+
0.1µF
QFN logic input pins that are externally tied high in an
V
CC
application, should use the V supply for the high voltage
L
RA
R
B
A
level.
RXEN *
Tx/Rx
RS-232 Mode Tx Enable/Disable (DEN)
DE
Y
The ISL3333 also adds an RS-232 mode Tx enable pin
(DENX) for each port. Driving one of these pins low disables
both drivers in the corresponding port. Because RS-232 is a
point-to-point (only one Tx allowed on the bus) standard, the
main use for this disable function is to reduce power by
eliminating the load current (approximately 1mA per Tx
output) through the 5kΩ resistor in the Rx at the cable’s far
DY
D
Z
GND
* QFN ONLY
ACTIVE LOW RX ENABLE
end. The I
in this mode is still considerably higher than in
FIGURE 13. USING ACTIVE LOW vs ACTIVE HIGH RX
ENABLE
CC
SHDN, but the enable time from Tx disable is much faster
(1.5µs vs. 25µs) than the enable time from SHDN due to the
charge pumps remaining on during Tx disable.
minimize EMI and reflections. Nevertheless, for the best jitter
performance when driving long cables, the faster speed
options may be preferable, even at lower data rates. The
faster output transitions deliver less variability (jitter) when
loaded with the large capacitance associated with long
cables. Of course, faster transitions require more attention to
ensuring short stub lengths and quality terminations, so
there are trade-offs to be made. Assuming a jitter budget of
10%, it is likely better to go with the slow speed option for
data rates of 115kbps or less, to minimize fast edge effects.
Likewise, the medium speed option is a good choice for data
rates between 115kbps and 460kbps. For higher data rates,
or when the absolute best jitter is required, use the high
speed option. Speed selection is via the SPA and SPB pins
(see Table 3), and the selection pertains to each port
programmed for RS-485 mode.
The DENX pin is ignored if the corresponding port is set for
RS-485 mode, and it is internally pulled high.
Active Low Rx Enable (RXEN)
In many RS-485 applications, especially half duplex
configurations, users like to accomplish “echo cancellation”
by disabling the corresponding receiver while its driver is
transmitting data. This function is available on the QFN
package via an active low RXEN pin for each port. The
active low function also simplifies direction control, by
allowing a single Tx/Rx direction control line. If an active high
RXEN were used, either two valuable I/O pins would be
used for direction control, or an external inverter is required
between DE and RXEN. Figure 13 details the advantage of
using the RXEN pin.
Evaluation Board
RS-485 Slew Rate Limited Data Rates
An evaluation board, part number ISL3333EVAL1Z, is
available to assist in assessing the dual protocol IC’s
performance. The evaluation board contains a QFN
packaged device, but because the same die is used in all
packages, the board is also useful for evaluating the
functionality of the other versions. The board’s design allows
for evaluation of all standard features, plus the QFN specific
features. Refer to the eval board application note for details,
and contact your sales rep for ordering information.
The SSOP version of this IC operates with Tx output
transitions optimized for a 20Mbps data rate. These fast
edges may increase EMI and reflection issues, even though
fast transitions aren’t required at the lower data rates used
by many applications. The ISL3333 (QFN version) solves
this problem by offering two additional, slew rate limited,
data rates that are optimized for speeds of 115kbps, and
460kbps.The slew limited edges permit longer unterminated
networks, or longer stubs off terminated busses, and help
FN6362.0
May 27, 2008
19
ISL3332, ISL3333
Typical Performance Curves V = V = 3.3V, T = +25°C; Unless Otherwise Specified
CC
L
A
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
30
25
20
15
10
5.0
0
V
, +25 °C
OL
V
, +25 °C
OH
V
, +85 °C
OL
V
, +85 °C
OH
I
= -0.5mA
OH
= -1mA
I
OH
I
= -6mA
OH
I
= -2mA
1.5
OH
1
2.0
(V)
2.5
3.0
3.3
0
1
2
3
3.3
V
RECEIVER OUTPUT VOLTAGE (V)
L
FIGURE 14. RECEIVER OUTPUT CURRENT vs RECEIVER
OUTPUT VOLTAGE
FIGURE 15. RECEIVER HIGH OUTPUT VOLTAGE vs LOGIC
SUPPLY VOLTAGE (V ) (QFN ONLY)
L
90
80
70
60
50
40
30
20
10
0
2.30
2.25
2.20
2.15
2.10
2.05
2.00
1.95
1.9
R
= 100Ω
DIFF
R
= 54Ω
DIFF
0
0.5
1
1.5
2
2.5
3
3.5
-40
0
50
85
-25
25
75
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
FIGURE 17. RS-485, DRIVER DIFFERENTIAL OUTPUT
VOLTAGE vs TEMPERATURE
FIGURE 16. RS-485, DRIVER OUTPUT CURRENT vs
DIFFERENTIAL OUTPUT VOLTAGE
250
4.5
+25 °C
RS-232, RXEN = X, DEN = V (IF QFN)
L
+85 °C
200
4.0
3.5
3.0
2.5
2.0
1.5
1
-40 °C
150
100
50
RS-232, DEN = GND, RXEN = X (QFN ONLY)
Y OR Z = LOW
0
RS-485, HALF DUPLEX, DE = V , RXEN = X
CC
Y OR Z = HIGH
-50
-100
-150
+25 °C
+85 °C
RS-485, DE = GND, RXEN = X
-40 °C
RS-485, FULL DUPLEX, DE = V , RXEN = X
CC
50
-40
0
85
-25
25
75
-7 -6
-4
-2
0
2
4
6
8
10
12
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
FIGURE 19. SUPPLY CURRENT vs TEMPERATURE
FIGURE 18. RS-485, DRIVER OUTPUT CURRENT vs SHORT
CIRCUIT VOLTAGE
FN6362.0
May 27, 2008
20
ISL3332, ISL3333
Typical Performance Curves V = V = 3.3V, T = +25°C; Unless Otherwise Specified (Continued)
CC
L
A
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
NO LOAD
= V or GND
NO LOAD
= V or GND
V
≤ V
V > V
L CC
V
V
L
CC
IN
LB = V
L
IN
L
LB = ON = V , RXEN = GND
L
L
ON = DZ/DE = DY = GND
RS-232/RS-485 I
RS-232, DEN = SP = V
CC
L
1
1.5
2.0
2.5
(V)
3.0
3.5
4.0
1
1.5
2.0
2.5
3.0
3.5
4.0
V
L
V
(V)
L
FIGURE 20. V SUPPLY CURRENT vs V VOLTAGE (QFN
FIGURE 21. V
CC
and V SHDN SUPPLY CURRENTS vs V
L L
L
L
ONLY)
VOLTAGE (QFN ONLY)
300
250
200
150
100
50
1640
1630
1620
1610
1600
1590
1580
1570
1560
1550
R
= 54Ω, C = 100pF
R
= 54Ω, C = 100pF
DIFF
L
DIFF
L
|t
- t |
PLHZ PHLY
|t |
- t
PHLZ PLHY
t
DHL
t
DLH
t
DHL
|t
- t
|
DLH DHL
0
-40
0
50
85
-25
25
75
-40
0
50
85
-25
25
75
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 23. RS-485, DRIVER SKEW vs TEMPERATURE
FIGURE 22. RS-485, DRIVER PROPAGATION DELAY vs
TEMPERATURE (SLOW DATA RATE, QFN ONLY)
(SLOW DATA RATE, QFN ONLY)
550
545
540
535
530
525
520
515
16
R
= 54Ω, C = 100pF
R
= 54Ω, C = 100pF
DIFF L
DIFF
L
14
12
10
8
|t
- t |
PLHZ PHLY
t
|t
- t |
PHLZ PLHY
DHL
t
DLH
6
t
DHL
4
|t
- t
|
DLH DHL
2
0
-40
0
50
85
-40
0
50
85
-25
25
75
-25
25
75
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 24. RS-485, DRIVER PROPAGATION DELAY vs
TEMPERATURE (MEDIUM DATA RATE, QFN
ONLY)
FIGURE 25. RS-485, DRIVER SKEW vs TEMPERATURE
(MEDIUM DATA RATE, QFN ONLY)
FN6362.0
May 27, 2008
21
ISL3332, ISL3333
Typical Performance Curves V = V = 3.3V, T = +25°C; Unless Otherwise Specified (Continued)
CC
L
A
24
23
22
21
20
19
18
17
16
15
3.0
2.5
2.0
1.5
1.0
0.5
0
R
= 54Ω, C = 100pF
R
= 54Ω, C = 100pF
L
DIFF
L
DIFF
|t
- t |
DLH DHL
t
DLH
|t
- t
|
PHLZ PLHY
t
DHL
|t
- t
|
PLHZ PHLY
-40
0
50
85
-40
0
50
85
-25
25
75
-25
25
75
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 26. RS-485, DRIVER PROPAGATION DELAY vs
FIGURE 27. RS-485, DRIVER SKEW vs TEMPERATURE
TEMPERATURE (FAST DATA RATE)
(FAST DATA RATE)
R
= 54Ω, C = 100pF
L
R
= 54Ω, C = 100pF
L
DIFF
DIFF
5
0
5
0
D
D
Y
Y
5
0
5
0
R
R
A
A
4
3
2
1
0
4
3
2
1
0
Z
Y
Y
Z
TIME (400ns/DIV)
TIME (400ns/DIV)
FIGURE 28. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (SLOW DATA RATE, QFN ONLY)
FIGURE 29. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (SLOW DATA RATE, QFN ONLY)
R
= 54Ω, C = 100pF
L
R
= 54Ω, C = 100pF
L
DIFF
DIFF
5
0
5
0
D
D
Y
Y
5
0
5
0
R
R
A
A
4
3
2
1
0
4
3
2
1
0
Z
Y
Y
Z
TIME (200ns/DIV)
TIME (200ns/DIV)
FIGURE 30. RS-485, DRIVER AND RECEIVER WAVEFORMS,
FIGURE 31. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (MEDIUM DATA RATE, QFN ONLY)
LOW TO HIGH (MEDIUM DATA RATE, QFN ONLY)
FN6362.0
May 27, 2008
22
ISL3332, ISL3333
Typical Performance Curves V = V = 3.3V, T = +25°C; Unless Otherwise Specified (Continued)
CC
L
A
R
= 54Ω, C = 100pF
R
= 54Ω, C = 100pF
L
DIFF
L
DIFF
5
0
5
0
D
D
Y
Y
5
0
5
0
R
A
R
A
4
3
2
1
0
4
3
2
1
0
Z
Y
Y
Z
TIME (10ns/DIV)
TIME (10ns/DIV)
FIGURE 33. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (FAST DATA RATE)
FIGURE 32. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (FAST DATA RATE)
7.5
7.5
5.0
V
+
OUT
250kbps
V
+
5.0
2.5
0
OUT
2.5
0
OUTPUTS STATIC
ALL T LOADED WITH 3kΩ TO GND
400kbps
ALL T
LOADED WITH 3kΩ TO GND
OUTS
OUTS
AND AT V+ OR V-
2 TRANSMITTERS AT 250kbps or 400kbps,
OTHER TRANSMITTERS AT 30kbps
-2.5
-5
-2.5
-5
400kbps
250kbps
V
-
OUT
V
-
OUT
-7.5
-7.5
0
1000
2000
3000
4000
5000
-40
0
50
85
-25
25
75
LOAD CAPACITANCE (pF)
TEMPERATURE (°C)
FIGURE 35. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
TEMPERATURE
FIGURE 34. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
LOAD CAPACITANCE
50
C
= 2000pF, 2 CHANNELS SWITCHING
L
40
5
0
5
0
Y or Z = LOW
DY
30
20
V
SHORTED TO GND
OUT
10
0
Y/A
-5
5
-10
-20
-30
RA
Y or Z = HIGH
0
2µs/DIV.
-40
0
50
85
-25
25
75
TEMPERATURE (°C)
FIGURE 37. RS-232, TRANSMITTER AND RECEIVER
WAVEFORMS AT 250kbps
FIGURE 36. RS-232, TRANSMITTER SHORT CIRCUIT
CURRENT vs TEMPERATURE
FN6362.0
May 27, 2008
23
ISL3332, ISL3333
Typical Performance Curves V = V = 3.3V, T = +25°C; Unless Otherwise Specified (Continued)
CC
L
A
58
57
56
55
54
53
52
51
50
49
V
= ±5V
IN
FULL TEMP RANGE
C
= 1000pF, 2 CHANNELS SWITCHING
L
5
0
5
0
DY
SR IN = 15V/µs
Y/A
-5
5
SR IN = 100V/µs
RA
0
0
500
1000
1500
2000
DATA RATE (kbps)
2µs/DIV.
FIGURE 38. RS-232, TRANSMITTER AND RECEIVER
WAVEFORMS AT 400kbps
FIGURE 39. RS-232, RECEIVER OUTPUT +DUTY CYCLE vs
DATA RATE
550
7.5
V
≥ ±4V AND DUTY CYCLE BETWEEN 40% AND 60%
OUT
500
450
400
350
300
250
200
150
100
ALL T
LOADED WITH 5kΩ TO GND
OUTS
+25°C
V
+
5
OUT
+85°C
2 TRANSMITTERS AT +25°C
2.5
1 TRANSMITTER AT +25°C
2 TRANSMITTERS SWITCHING
0
ALL T
OUTS
LOADED WITH 5kΩ TO GND, C = 1000pF
L
-2.5
1 TRANSMITTER AT +85°C
2 TRANSMITTERS AT +85°C
+85°C
+25°C
-5
V
-
OUT
-7.5
0
1000
2000
3000
4000
5000
0
100
200
300
400
500
600
LOAD CAPACITANCE (pF)
DATA RATE (kbps)
FIGURE 40. RS-232, TRANSMITTER MAXIMUM DATA RATE vs
LOAD CAPACITANCE
FIGURE 41. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
DATA RATE
Die Characteristics
650
2 TRANSMITTERS SWITCHING
SUBSTRATE AND QFN PAD POTENTIAL
(POWERED UP):
ALL T
LOADED WITH 3kΩ TO GND, C = 1000pF
L
600
550
500
450
400
350
300
250
OUTS
+85°C
GND
TRANSISTOR COUNT:
4838
PROCESS:
+25°C
-40 °C
BiCMOS
0
50
200
400
600
650
DATA RATE (kbps)
FIGURE 42. RS-232, TRANSMITTER SKEW vs DATA RATE
FN6362.0
May 27, 2008
24
ISL3332, ISL3333
Shrink Small Outline Plastic Packages (SSOP)
M28.209 (JEDEC MO-150-AH ISSUE B)
N
28 LEAD SHRINK SMALL OUTLINE PLASTIC PACKAGE
INDEX
AREA
0.25(0.010)
M
B M
H
INCHES
MILLIMETERS
E
GAUGE
PLANE
SYMBOL
MIN
MAX
0.078
-
MIN
-
MAX
2.00
-
NOTES
-B-
A
A1
A2
B
-
-
0.002
0.065
0.009
0.004
0.390
0.197
0.05
1.65
0.22
0.09
9.90
5.00
-
1
2
3
0.072
0.014
0.009
0.413
0.220
1.85
0.38
0.25
10.50
5.60
-
L
0.25
0.010
SEATING PLANE
A
9
-A-
C
D
E
-
D
3
-C-
4
α
e
0.026 BSC
0.65 BSC
-
A2
e
A1
C
H
L
0.292
0.022
0.322
0.037
7.40
0.55
8.20
0.95
-
B
0.10(0.004)
6
0.25(0.010) M
C
A M B S
N
α
28
28
7
NOTES:
0°
8°
0°
8°
-
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2
of Publication Number 95.
Rev. 2 6/05
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate
burrs. Mold flash, protrusion and gate burrs shall not exceed
0.20mm (0.0078 inch) per side.
4. Dimension “E” does not include interlead flash or protrusions.
Interlead flash and protrusions shall not exceed 0.20mm (0.0078
inch) per side.
5. The chamfer on the body is optional. If it is not present, a visual
index feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. Dimension “B” does not include dambar protrusion. Allowable
dambar protrusion shall be 0.13mm (0.005 inch) total in excess of
“B” dimension at maximum material condition.
10. Controlling dimension: MILLIMETER. Converted inch dimensions
are not necessarily exact.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN6362.0
May 27, 2008
25
ISL3332, ISL3333
Package Outline Drawing
L40.6x6
40 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE
Rev 3, 10/06
4X
4.5
6.00
0.50
36X
A
6
B
31
40
PIN #1 INDEX AREA
6
30
1
PIN 1
INDEX AREA
4 . 10 ± 0 . 15
21
10
(4X)
0.15
11
20
0.10 M C A B
TOP VIEW
40X 0 . 4 ± 0 . 1
4
0 . 23 +0 . 07 / -0 . 05
BOTTOM VIEW
SEE DETAIL "X"
C
0.10
C
0 . 90 ± 0 . 1
BASE PLANE
( 5 . 8 TYP )
(
SEATING PLANE
0.08 C
SIDE VIEW
4 . 10 )
( 36X 0 . 5 )
5
C
0 . 2 REF
( 40X 0 . 23 )
0 . 00 MIN.
0 . 05 MAX.
( 40X 0 . 6 )
DETAIL "X"
TYPICAL RECOMMENDED LAND PATTERN
NOTES:
1. Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3.
Unless otherwise specified, tolerance : Decimal ± 0.05
4. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
Tiebar shown (if present) is a non-functional feature.
5.
6.
The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 identifier may be
either a mold or mark feature.
FN6362.0
May 27, 2008
26
相关型号：
ISL34321INZ
SPECIALTY INTERFACE CIRCUIT, PQFP48, 7 X 7 MM, ROHS COMPLIANT, PLASTIC, MS-026ABC-HD, TQFP-48
RENESAS
ISL34321INZ-T13
SPECIALTY INTERFACE CIRCUIT, PQFP48, 7 X 7 MM, ROHS COMPLIANT, PLASTIC, MS-026ABC-HD, TQFP-48
RENESAS
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