ISL81487E [INTERSIL]
【15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers; 【 15kV ESD保护， 1/8单位负载， 5V ，低功耗，高速或限摆率， RS - 485 / RS -422收发器
| 型号： | ISL81487E |
| 厂家： | 
Intersil |
| 描述： | 【15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers |
| 文件： | 总14页 (文件大小：526K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ISL8487E, ISL81487L, ISL81487E
®
Data Sheet
September 15, 2005
FN6051.6
±15kV ESD Protected, 1/8 Unit Load, 5V,
Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers
Features
• RS-485 I/O Pin ESD Protection . . . . . . . . . . ±15kV HBM
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
These Intersil RS-485/RS-422 devices are ESD protected,
fractional unit load (UL), BiCMOS, 5V powered, single
transceivers that meet both the RS-485 and RS-422
standards for balanced communication. Each driver output/
receiver input is protected against ±15kV ESD strikes,
without latch-up. Unlike competitive devices, this Intersil
family is specified for 10% tolerance supplies (4.5V to 5.5V).
• Fractional Unit Load Allows up to 256 Devices on the Bus
• Specified for 10% Tolerance Supplies
• High Data Rate Version (ISL81487E) . . . . . up to 5Mbps
• Slew Rate Limited Versions for Error Free Data
Transmission (ISL8487E, ISL81487L) . . . . .up to 250kbps
• Low Current Shutdown Mode (Except ISL81487E). . . 0.5µA
All devices present a 1/8 “unit load” to the RS-485 bus,
which allows up to 256 transceivers on the network for large
node count systems (e.g., process automation, remote
meter reading systems). In a remote utility meter reading
system, individual (apartments for example) utility meter
readings are routed to a concentrator via an RS-485
network, so the high allowed node count minimizes the
number of repeaters required to network all the meters. Data
for all meters is then read out from the concentrator via a
single access port, or a wireless link.
• Low Quiescent Supply Current:
- ISL8487E, ISL81487L . . . . . . . . . . . . . . . 145µA (Max.)
- ISL81487E . . . . . . . . . . . . . . . . . . . . . . . . 420µA (Max.)
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs
• 30ns Propagation Delays, 5ns Skew (ISL81487E)
• Half Duplex Pinouts
• Operate from a Single +5V Supply (10% Tolerance)
Slew rate limited drivers on the ISL8487E and ISL81487L
reduce EMI, and minimize reflections from improperly
terminated transmission lines, or unterminated stubs in
multidrop and multipoint applications. Data rates up to
250kbps are achievable with these devices.
• Current Limiting and Thermal Shutdown for Driver
Overload Protection
• Pin Compatible Replacements for: MAX487E, (ISL8487E);
LTC1487, ADM1487 (ISL81487L); MAX1487E, ST485ER
(ISL81487E)
Data rates up to 5Mbps are achievable by using the
ISL81487E, which features higher slew rates.
• Pb-Free Plus Anneal Available (RoHS Compliant)
Receiver (Rx) inputs feature a “fail-safe if open” design,
which ensures a logic high Rx output if Rx inputs are floating.
Applications
• High Node Count Networks
• Automated Utility Meter Reading Systems
• Factory Automation
Driver (Tx) outputs are short circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.
• Security Networks
These half duplex devices multiplex the Rx inputs and Tx
outputs to allow transceivers with Rx and Tx disable
functions in 8 lead packages.
• Building Environmental Control Systems
• Industrial/Process Control Networks
TABLE 1. SUMMARY OF FEATURES
PART
HALF/FULL
DUPLEX
NO. OF DEVICES
DATA RATE SLEW-RATE
RECEIVER/
QUIESCENT LOW POWER
PIN
NUMBER
ALLOWED ON BUS
(Mbps)
0.25
0.25
5
LIMITED?
Yes
DRIVER ENABLE?
I
(µA) SHUTDOWN? COUNT
CC
120
ISL8487E
ISL81487L
ISL81487E
Half
Half
Half
256
256
256
Yes
Yes
Yes
Yes
Yes
No
8
8
8
Yes
120
350
No
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003-2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL8487E, ISL81487L, ISL81487E
Truth Tables
Pinout
ISL8487E, ISL81487L, ISL81487E (PDIP, SOIC)
TRANSMITTING
TOP VIEW
INPUTS
OUTPUTS
RO
RE
DE
DI
1
2
3
4
8
7
6
5
V
CC
RE
X
DE
1
DI
1
Z
0
1
Y
1
R
B/Z
A/Y
X
1
0
0
D
GND
0
0
X
X
High-Z
High-Z
High-Z *
1
0
High-Z *
*Shutdown Mode for ISL8487E, ISL81487L (See Note 7)
Ordering Information
PART NO.
(BRAND)
TEMP.
PKG.
RANGE (°C)
PACKAGE
DWG. #
RECEIVING
ISL8487EIB*
-40 to 85
-40 to 85
8 Ld SOIC
M8.15
INPUTS
OUTPUT
(8487EIB)
RE
0
DE
0
A-B
≥ +0.2V
≤ -0.2V
Inputs Open
X
RO
ISL8487EIBZ*
(8487EIB)(Note)
ISL8487EIP
ISL81487LIB*
(81487LIB)
ISL81487LIBZ*
(81487LIB)(Note)
ISL81487LIP
ISL81487EIB*
(81487EIB)
8 Ld SOIC
(Pb-free)
8 Ld PDIP
8 Ld SOIC
M8.15
1
0
-40 to 85
-40 to 85
E8.3
M8.15
0
0
0
0
1
-40 to 85
8 Ld SOIC
(Pb-free)
8 Ld PDIP
8 Ld SOIC
M8.15
1
0
High-Z *
High-Z
1
1
X
-40 to 85
-40 to 85
E8.3
M8.15
*Shutdown Mode for ISL8487E, ISL81487L (See Note 7)
ISL81487EIBZ*
(81487EIB)(Note)
-40 to 85
8 Ld SOIC
(Pb-free)
M8.15
ISL81487EIP
ISL81487EIPZ
(ISL81487EIPZ)(Note)
-40 to 85
-40 to 85
8 Ld PDIP
8 Ld PDIP
(Pb-free)
E8.3
E8.3
*Add “-T” suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are 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.
Pin Descriptions
PIN
FUNCTION
RO
RE
Receiver output: If A > B by at least 0.2V, RO is high; If A < B by 0.2V or more, RO is low; RO = High if A and B are unconnected (floating).
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high.
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is low.
Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low.
Ground connection.
DE
DI
GND
A/Y
±15kV HBM ESD Protected, RS-485/422 level, noninverting receiver input and non-inverting driver output. Pin is an input (A) if
DE = 0; pin is an output (Y) if DE = 1.
B/Z
±15kV HBM ESD Protected, RS-485/422 level, inverting receiver input and inverting driver output. Pin is an input (B) if DE = 0; pin is
an output (Z) if DE = 1.
V
System power supply input (4.5V to 5.5V).
CC
FN6051.6
2
ISL8487E, ISL81487L, ISL81487E
Typical Operating Circuits
ISL8487E, ISL81487L, ISL81487E
+5V
+5V
+
+
0.1µF
0.1µF
8
V
8
V
CC
CC
RO
1
2
4
DI
R
D
RE
DE
R
T
R
T
3
2
7
6
7
6
B/Z
A/Y
DE
RE
B/Z
A/Y
3
4
DI
1
RO
R
D
GND
5
GND
5
FN6051.6
3
ISL8487E, ISL81487L, ISL81487E
Absolute Maximum Ratings
Thermal Information
Thermal Resistance (Typical, Note 1)
8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . .
8 Ld PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum Junction Temperature (Plastic Package) . . . . . . . 150°C
Maximum Storage Temperature Range. . . . . . . . . . .-65°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300°C
(SOIC - Lead Tips Only)
V
to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
θ
JA
(°C/W)
170
140
CC
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V
Input/Output Voltages
+0.5V)
CC
A/Y, B/Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V to +12.5V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (V
Short Circuit Duration
+0.5V)
CC
Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Operating Conditions
Temperature Range
ISL8XXXIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to 85°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1. θ is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
JA
(
Electrical Specifications Test Conditions: V = 4.5V to 5.5V; Unless Otherwise Specified.
CC
CC
Typicals are at V
= 5V, T = 25°C, (Note 2)
A
TEMP
(°C)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNITS
DC CHARACTERISTICS
Driver Differential V
Driver Differential V
(no load)
V
V
Full
Full
Full
Full
-
2
-
V
V
V
V
V
OUT
OD1
CC
-
(with load)
R = 50Ω (RS-422), (Figure 1)
R = 27Ω (RS-485), (Figure 1)
R = 27Ω or 50Ω, (Figure 1)
3
OUT
OD2
1.5
-
2.3
0.01
5
Change in Magnitude of Driver
Differential V for
∆V
0.2
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
V
V
OUT
Change in Magnitude of Driver
Common-Mode V for
OC
∆V
0.01
0.2
OC
OUT
Complementary Output States
Logic Input High Voltage
Logic Input Low Voltage
V
DE, DI, RE
DE, DI, RE
DE, DI, RE
Full
Full
Full
Full
Full
Full
Full
Full
2
-
-
-
-
-
-
-
-
-
V
IH
V
-
0.8
2
V
IL
Logic Input Current
I
-2
µA
µA
µA
µA
µA
V
IN1
IN2
Input Current (A/Y, B/Z), (Note 10)
I
I
DE = 0V, V
5.5V
= 4.5 to
= 0V
V
V
V
V
= 12V
= -7V
= 12V
= -7V
-
140
-120
180
-100
0.2
CC
IN
IN
IN
IN
-
DE = 0V, V
-
-
IN2
CC
Receiver Differential Threshold
Voltage
V
-7V ≤ V
≤ 12V
-0.2
TH
CM
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
∆V
V
= 0V
25
-
3.5
-
70
-
-
-
mV
V
TH
CM
V
I
I
= -4mA, V = 200mV
ID
Full
Full
Full
OH
O
O
V
= -4mA, V = 200mV
ID
-
0.4
±1
V
OL
Three-State (high impedance)
Receiver Output Current
I
0.4V ≤ V ≤ 2.4V
-
-
µA
OZR
O
Receiver Input Resistance
R
-7V ≤ V
≤ 12V
CM
Full
96
-
-
kΩ
IN
FN6051.6
4
ISL8487E, ISL81487L, ISL81487E
Electrical Specifications Test Conditions: V = 4.5V to 5.5V; Unless Otherwise Specified.
CC
CC
Typicals are at V
= 5V, T = 25°C, (Note 2) (Continued)
A
TEMP
(°C)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
400
350
160
120
0.5
-
MAX UNITS
No-Load Supply Current, (Note 3)
I
ISL81487E, DI, RE = 0V DE = V
Full
Full
Full
Full
Full
Full
-
-
500
420
200
145
8
µA
µA
µA
µA
µA
mA
CC
CC
or V
CC
DE = 0V
ISL8487E, ISL81487L, DE = V
-
CC
DI, RE = 0V or V
CC
DE = 0V
-
Shutdown Supply Current
Driver Short-Circuit Current,
I
(Note 7), DE = 0V, RE = V , DI = 0V or V
CC
-
SHDN
CC
DE = V , -7V ≤ V or V ≤ 12V, (Note 4)
I
35
250
OSD1
CC
Y
Z
V
= High or Low
O
Receiver Short-Circuit Current
I
0V ≤ V ≤ V
CC
Full
7
-
85
mA
OSR
O
SWITCHING CHARACTERISTICS (ISL81487E)
Driver Input to Output Delay
Driver Output Skew
t
, t
PLH PHL
R
R
R
C
C
C
C
= 54Ω, C = 100pF, (Figure 2)
Full
Full
Full
Full
Full
Full
Full
Full
25
15
-
24
3
50
10
25
70
70
70
70
150
-
ns
ns
DIFF
DIFF
DIFF
L
t
= 54Ω, C = 100pF, (Figure 2)
L
SKEW
t , t
Driver Differential Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
Receiver Input to Output Delay
= 54Ω, C = 100pF, (Figure 2)
3
-
12
14
14
44
21
90
5
ns
R
F
L
t
= 100pF, SW = GND, (Figure 2)
ns
ZH
L
L
L
L
t
= 100pF, SW = V , (Figure 2)
CC
-
ns
ZL
t
= 15pF, SW = GND, (Figure 2)
-
ns
HZ
t
= 15pF, SW = V , (Figure 2)
CC
-
ns
LZ
, t
t
(Figure 4)
(Figure 4)
30
-
ns
PLH PHL
Receiver Skew | t
- t
PLH PHL
|
t
ns
SKD
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
Maximum Data Rate
t
C
C
C
C
= 15pF, SW = GND, (Figure 5)
Full
Full
Full
Full
Full
-
9
50
50
50
50
-
ns
ZH
L
L
L
L
t
= 15pF, SW = V , (Figure 5)
CC
-
9
ns
ZL
t
= 15pF, SW = GND, (Figure 5)
-
9
ns
HZ
t
= 15pF, SW = V , (Figure 5)
CC
-
9
ns
LZ
f
5
-
Mbps
MAX
SWITCHING CHARACTERISTICS (ISL8487E)
Driver Input to Output Delay
Driver Output Skew
t
, t
PLH PHL
R
R
R
C
C
C
C
= 54Ω, C = 100pF, (Figure 2)
Full
Full
Full
Full
Full
Full
Full
Full
25
250
-
650
160
900
1000
860
660
640
500
60
2000
800
2000
2000
2000
3000
3000
2000
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
kbps
ns
ns
DIFF
DIFF
DIFF
L
t
= 54Ω, C = 100pF, (Figure 2)
L
SKEW
t , t
Driver Differential Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
Receiver Input to Output Delay
= 54Ω, C = 100pF, (Figure 2)
250
250
250
300
300
250
-
R
F
L
t
= 100pF, SW = GND, (Figure 3, Note 5)
ZH
L
L
L
L
t
= 100pF, SW = V , (Figure 3, Note 5)
CC
ZL
t
= 15pF, SW = GND, (Figure 3)
HZ
t
= 15pF, SW = V , (Figure 3)
CC
LZ
, t
t
(Figure 4)
(Figure 4)
PLH PHL
Receiver Skew | t
- t
PLH PHL
|
t
SKD
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
Maximum Data Rate
t
C
C
C
C
= 15pF, SW = GND, (Figure 5, Note 6)
Full
Full
Full
Full
Full
Full
Full
-
10
50
ZH
L
L
L
L
t
= 15pF, SW = V , (Figure 5, Note 6)
CC
-
10
50
ZL
t
= 15pF, SW = GND, (Figure 5)
-
10
50
HZ
t
= 15pF, SW = V , (Figure 5)
CC
-
10
50
LZ
f
250
50
-
-
-
MAX
Time to Shutdown
t
(Note 7)
120
1000
600
2000
SHDN
Driver Enable from Shutdown to
Output High
t
C
= 100pF, SW = GND, (Figure 3, Notes 7, 8)
ZH(SHDN)
L
Driver Enable from Shutdown to
Output Low
t
C
= 100pF, SW = V , (Figure 3, Notes 7, 8)
CC
Full
-
1000
2000
ns
ZL(SHDN)
L
FN6051.6
5
ISL8487E, ISL81487L, ISL81487E
Electrical Specifications Test Conditions: V = 4.5V to 5.5V; Unless Otherwise Specified.
CC
CC
Typicals are at V
= 5V, T = 25°C, (Note 2) (Continued)
A
TEMP
(°C)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX UNITS
Receiver Enable from Shutdown to
Output High
t
C
C
= 15pF, SW = GND, (Figure 5, Notes 7, 9)
Full
-
800
2500
ns
ZH(SHDN)
L
Receiver Enable from Shutdown to
Output Low
t
= 15pF, SW = V , (Figure 5, Notes 7, 9)
CC
Full
-
800
2500
ns
ZL(SHDN)
L
SWITCHING CHARACTERISTICS (ISL81487L)
Driver Input to Output Delay
Driver Output Skew
t
, t
PLH PHL
R
R
R
C
C
C
C
= 54Ω, C = 100pF, (Figure 2)
Full
Full
Full
Full
Full
Full
Full
Full
25
150
-
650
160
900
1000
1000
750
750
175
13
1200
600
1200
1500
1500
1500
1500
250
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
kbps
ns
ns
DIFF
DIFF
DIFF
L
t
= 54Ω, C = 100pF, (Figure 2)
L
SKEW
t , t
Driver Differential Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output High
Driver Disable from Output Low
Receiver Input to Output Delay
= 54Ω, C = 100pF, (Figure 2)
250
100
100
150
150
30
-
R
F
L
t
= 100pF, SW = GND, (Figure 3, Note 5)
ZH
L
L
L
L
t
= 100pF, SW = V , (Figure 3, Note 5)
CC
ZL
t
= 15pF, SW = GND, (Figure 3)
HZ
t
= 15pF, SW = V , (Figure 3)
CC
LZ
, t
t
(Figure 4)
(Figure 4)
PLH PHL
Receiver Skew | t
- t
PLH PHL
|
t
SKD
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output High
Receiver Disable from Output Low
Maximum Data Rate
t
C
C
C
C
= 15pF, SW = GND, (Figure 5, Note 6)
Full
Full
Full
Full
Full
Full
Full
-
10
50
ZH
L
L
L
L
t
= 15pF, SW = V , (Figure 5, Note 6)
CC
-
10
50
ZL
t
= 15pF, SW = GND, (Figure 5)
-
10
50
HZ
t
= 15pF, SW = V , (Figure 5)
CC
-
10
50
LZ
f
250
50
-
-
-
MAX
Time to Shutdown
t
(Note 7)
140
1100
600
2000
SHDN
Driver Enable from Shutdown to
Output High
t
t
C
C
C
C
= 100pF, SW = GND, (Figure 3, Notes 7, 8)
ZH(SHDN)
L
L
L
L
Driver Enable from Shutdown to
Output Low
t
= 100pF, SW = V , (Figure 3, Notes 7, 8)
CC
Full
Full
Full
-
-
-
1000
900
2000
2000
2000
ns
ns
ns
ZL(SHDN)
Receiver Enable from Shutdown to
Output High
= 15pF, SW = GND, (Figure 5, Notes 7, 9)
ZH(SHDN)
Receiver Enable from Shutdown to
Output Low
t
= 15pF, SW = V , (Figure 5, Notes 7, 9)
CC
900
ZL(SHDN)
ESD PERFORMANCE
RS-485 Pins (A/Y, B/Z)
All Other Pins
Human Body Model
25
25
-
-
±15
>±7
-
-
kV
kV
NOTES:
2. Currents into device pins are positive; currents out of device pins are negative. Voltages are referenced to ground unless otherwise specified.
3. Supply current specification is valid for loaded drivers when DE = 0V.
4. Applies to peak current. See “Typical Performance Curves” for more information.
5. When testing the ISL8487E and ISL81487L, keep RE = 0 to prevent the device from entering SHDN.
6. When testing the ISL8487E and ISL81487L, the RE signal high time must be short enough (typically <200ns) to prevent the device from entering
SHDN.
7. The ISL8487E and ISL81487L are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns, the parts
are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts are guaranteed to have entered shutdown. See
“Low-Power Shutdown Mode” section.
8. Keep RE = V , and set the DE signal low time >600ns to ensure that the device enters SHDN.
CC
9. Set the RE signal high time >600ns to ensure that the device enters SHDN.
10. Devices meeting these limits are denoted as “1/8 unit load (1/8 UL)” transceivers. The RS-485 standard allows up to 32 Unit Loads on the bus,
so there can be 256 1/8 UL devices on a bus.
FN6051.6
6
ISL8487E, ISL81487L, ISL81487E
Test Circuits and Waveforms
R
DE
V
CC
Z
DI
V
D
OD
Y
V
R
OC
FIGURE 1. DRIVER V
AND V
DI
OD
OC
3V
0V
1.5V
PLH
1.5V
PHL
t
t
t
V
OH
50%
50%
50%
OUT (Y)
OUT (Z)
C
= 100pF
L
V
DE
DI
OL
V
CC
Z
Y
t
PHL
PLH
R
DIFF
D
V
OH
C
= 100pF
L
50%
90%
V
SIGNAL
GENERATOR
OL
+V
OD
90%
10%
DIFF OUT (Y - Z)
10%
-V
OD
t
t
R
F
SKEW = |t
PLH
(Y or Z) - t
(Z or Y)|
PHL
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
DE
DI
Z
Y
500Ω
V
CC
GND
D
3V
0V
SW
SIGNAL
GENERATOR
DE
1.5V
1.5V
HZ
NOTE 7
C
L
t
, t
ZH ZH(SHDN)
NOTE 7
t
OUTPUT HIGH
2.3V
(SHDN) for ISL8487E and ISL81487L only.
V
OH
V
- 0.5V
OH
PARAMETER OUTPUT
RE
X
DI
SW
GND
C (pF)
L
15
OUT (Y, Z)
t
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
1/0
0/1
1/0
0/1
1/0
0/1
0V
HZ
t
X
V
15
LZ
CC
t
, t
t
ZL ZL(SHDN)
LZ
t
0 (Note 5)
0 (Note 5)
1 (Note 7)
1 (Note 7)
GND
100
100
100
100
NOTE 7
ZH
V
CC
OL
t
V
OUT (Y, Z)
ZL
CC
2.3V
V
OL
+ 0.5V
t
GND
V
ZH(SHDN)
OUTPUT LOW
t
V
CC
ZL(SHDN)
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
FN6051.6
7
ISL8487E, ISL81487L, ISL81487E
Test Circuits and Waveforms (Continued)
RE
B
A
3V
0V
15pF
A
1.5V
PLH
1.5V
PHL
+1.5V
RO
R
t
t
V
SIGNAL
GENERATOR
CC
50%
50%
RO
0V
FIGURE 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. RECEIVER PROPAGATION DELAY
RE
B
1kΩ
V
CC
GND
RO
R
SW
SIGNAL
NOTE 7
A
GENERATOR
3V
15pF
RE
1.5V
1.5V
HZ
0V
(SHDN) for ISL8487E and ISL81487L only.
t
, t
ZH ZH(SHDN)
NOTE 7
t
OUTPUT HIGH
1.5V
PARAMETER
DE
0
A
SW
GND
V
OH
V
- 0.5V
OH
t
+1.5V
-1.5V
+1.5V
-1.5V
+1.5V
-1.5V
RO
HZ
0V
t
0
V
LZ
CC
GND
t
(Note 6)
(Note 6)
0
ZH
t
, t
ZL ZL(SHDN)
NOTE 7
t
LZ
t
0
V
ZL
CC
GND
V
CC
OL
RO
t
(Note 7)
(Note 7)
0
ZH(SHDN)
1.5V
V
+ 0.5V
OL
V
t
0
V
CC
ZL(SHDN)
OUTPUT LOW
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER ENABLE AND DISABLE TIMES
ground potential differences, as well as voltages induced in
the cable by external fields.
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards for use in long haul or noisy
environments. RS-422 is a subset of RS-485, so RS-485
transceivers are also RS-422 compliant. RS-422 is a point-
to-multipoint (multidrop) standard, which allows only one
driver and up to 10 (assuming one unit load devices)
receivers on each bus. RS-485 is a true multipoint standard,
which allows up to 32 one unit load devices (any
combination of drivers and receivers) on each bus. To allow
for multipoint operation, the RS-485 spec requires that
drivers must handle bus contention without sustaining any
damage.
Receiver Features
These devices utilize a differential input receiver for maximum
noise immunity and common mode rejection. Input sensitivity
is ±200mV, as required by the RS-422 and RS-485
specifications.
Receiver input resistance of 96kΩ surpasses the RS-422
spec of 4kΩ, and is eight times the RS-485 “Unit Load (UL)”
requirement of 12kΩ minimum. Thus, these products are
known as “one-eighth UL” transceivers, and there can be up
to 256 of these devices on a network while still complying
with the RS-485 loading spec.
Another important advantage of RS-485 is the extended
common mode range (CMR), which specifies that the driver
outputs and receiver inputs withstand signals that range from
+12V to -7V. RS-422 and RS-485 are intended for runs as
long as 4000’, so the wide CMR is necessary to handle
Receiver inputs function with common mode voltages as
great as ±7V outside the power supplies (i.e., +12V and
-7V), making them ideal for long networks where induced
voltages are a realistic concern.
FN6051.6
8
ISL8487E, ISL81487L, ISL81487E
All the receivers include a “fail-safe if open” function that
guarantees a high level receiver output if the receiver inputs
are unconnected (floating).
The driver output stages incorporate short circuit current
limiting circuitry which ensures that the output current never
exceeds the RS-485 spec, even at the common mode
voltage range extremes. Additionally, these devices utilize a
foldback circuit which reduces the short circuit current, and
thus the power dissipation, whenever the contending voltage
exceeds either supply.
Receivers easily meet the data rates supported by the
corresponding driver, and receiver outputs are three-statable
via the active low RE input.
Driver Features
In the event of a major short circuit condition, these 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.
The RS-485/422 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 width, and to
minimize EMI.
Driver outputs are three-statable via the active high DE
input.
The ISL8487E and ISL81487L driver outputs are slew rate
limited to minimize EMI, and to minimize reflections in
unterminated or improperly terminated networks. Data rate
on these slew rate limited versions is a maximum of
250kbps. ISL81487E drivers are not limited, so faster output
transition times allow data rates of at least 5Mbps.
Low Power Shutdown Mode (Excluding
ISL81487E)
These CMOS transceivers all use a fraction of the power
required by their bipolar counterparts, but the ISL8487E
and ISL81487L include a shutdown feature that reduces
the already low quiescent I
to a 500nA trickle. They
CC
enter shutdown whenever the receiver and driver are
simultaneously disabled (RE = V and DE = GND) for a
Data Rate, Cables, and Terminations
CC
RS-485/422 are intended for network lengths up to 4000’,
but the maximum system data rate decreases as the
transmission length increases. Devices operating at 5Mbps
are limited to lengths less than a few hundred feet, while the
250kbps versions can operate at full data rates with lengths
in excess of 1000’.
period of at least 600ns. Disabling both the driver and the
receiver for less than 50ns guarantees that shutdown is not
entered.
Note that receiver and driver enable times increase when
enabling from shutdown. Refer to Notes 5-9, at the end of
the Electrical Specification table, for more information.
Twisted pair is the cable of choice for RS-485/422 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.
ESD Protection
All pins on these interface devices include class 3 Human
Body Model (HBM) ESD protection structures, but the
RS-485 pins (driver outputs and receiver inputs)
To minimize reflections, proper termination is imperative
when using the 5Mbps device. Short networks using the
250kbps versions need not be terminated, but, terminations
are recommended unless power dissipation is an overriding
concern.
incorporate advanced structures allowing them to survive
ESD events in excess of ±15kV HBM. The RS-485 pins are
particularly vulnerable to ESD damage because they
typically connect to an exposed port on the exterior of the
finished product. Simply touching the port pins, or
connecting a cable, can cause an ESD event that might
destroy unprotected ICs. These new ESD structures
protect the device whether or not it is powered up, protect
without allowing any latchup mechanism to activate, and
without degrading the RS-485 common mode range of -7V
to +12V. This built-in ESD protection eliminates the need
for board level protection structures (e.g., transient
suppression diodes), and the associated, undesirable
capacitive load they present.
In point-to-point, or point-to-multipoint (single driver on bus)
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. Multipoint (multi-driver) systems require
that the main cable be terminated in its characteristic
impedance at both ends. Stubs connecting a transceiver to
the main cable should be kept as short as possible.
Built-In Driver Overload Protection
As stated previously, the RS-485 spec requires that drivers
survive worst case bus contentions undamaged. These
devices meet this requirement via driver output short circuit
current limits, and on-chip thermal shutdown circuitry.
FN6051.6
9
ISL8487E, ISL81487L, ISL81487E
HBM method determines an IC’s ability to withstand the ESD
Human Body Model Testing
events typically present during handling and manufacturing.
As the name implies, this test method emulates the ESD
event delivered to an IC during human handling. The tester
delivers the charge stored on a 100pF capacitor through a
1.5kΩ current limiting resistor into the pin under test. The
The RS-485 pin survivability on this high ESD family has
been characterized to be in excess of ±15kV, for discharges
to GND.
Typical Performance Curves V = 5V, T = 25°C, ISL8487E, ISL81487L and ISL81487E;
CC
A
Unless Otherwise Specified
3.6
3.4
3.2
3
90
80
70
60
50
40
30
R
= 100Ω
DIFF
2.8
2.6
2.4
2.2
2
R
= 54Ω
DIFF
20
10
0
0
1
2
3
4
5
-40
0
50
85
-25
25
75
DIFFERENTIAL OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
FIGURE 6. DRIVER OUTPUT CURRENT vs DIFFERENTIAL
OUTPUT VOLTAGE
FIGURE 7. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs
TEMPERATURE
400
160
ISL81487E, DE = V , RE = X
CC
140
120
100
80
ISL81487E
350
300
Y OR Z = LOW
ISL81487E, DE = GND, RE = X
ISL8487E, ISL81487L
60
40
20
0
-20
-40
-60
250
200
150
100
Y OR Z = HIGH
ISL8487E, ISL81487L, DE = V , RE = X
CC
ISL81487E
ISL8487E, ISL81487L
-80
-100
ISL8487E, ISL81487L, DE = GND, RE = GND
-120
-40
0
50
85
-7 -6
-4
-2
0
2
4
6
8
10
12
-25
25
75
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
FIGURE 8. DRIVER OUTPUT CURRENT vs SHORT CIRCUIT
VOLTAGE
FIGURE 9. SUPPLY CURRENT vs TEMPERATURE
FN6051.6
10
ISL8487E, ISL81487L, ISL81487E
Typical Performance Curves V = 5V, T = 25°C, ISL8487E, ISL81487L and ISL81487E;
CC
A
Unless Otherwise Specified (Continued)
250
750
700
650
600
550
500
450
200
t
PLHY
t
PLHZ
|t
- t |
PLHY PHLZ
150
100
50
|t |
- t
PHLY PLHZ
t
PHLY
t
PHLZ
|CROSS PT. OF Y↑ & Z↓ - CROSS PT. OF Y↓ & Z↑|
0
-40
0
50
85
-40
0
50
85
-25
25
TEMPERATURE (°C)
75
-25
25
TEMPERATURE (°C)
75
FIGURE 10. DRIVER PROPAGATION DELAY vs
TEMPERATURE (ISL8487E, ISL81487L)
FIGURE 11. DRIVER SKEW vs TEMPERATURE
(ISL8487E, ISL81487L)
30
28
5
4
|t
- t
PHLY PLHZ|
26
24
22
20
18
16
3
2
1
0
|t
- t
PLHY PHLZ|
t
PLHY
t
PHLZ
t
PLHZ
|CROSSING PT. OF Y↑ & Z↓ - CROSSING PT. OF Y↓ & Z↑|
t
PHLY
-25
-40
0
50
85
-40
0
50
85
25
75
-25
25
75
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 12. DRIVER PROPAGATION DELAY vs
FIGURE 13. DRIVER SKEW vs TEMPERATURE
TEMPERATURE (ISL81487E)
(ISL81487E)
5
0
5
0
R
= 54Ω, C = 100pF
L
DI
DI
DIFF
R
= 54Ω, C = 100pF
L
DIFF
5
0
5
0
RO
ISL81487L
RO
RO
ISL81487L
5
0
5
0
ISL8487E
RO
ISL8487E
4
4
B/Z
A/Y
A/Y
B/Z
3
3
2
2
1
0
1
0
TIME (400ns/DIV)
TIME (400ns/DIV)
FIGURE 14. DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (ISL8487E, ISL81487L)
FIGURE 15. DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (ISL8487E, ISL81487L)
FN6051.6
11
ISL8487E, ISL81487L, ISL81487E
Typical Performance Curves V = 5V, T = 25°C, ISL8487E, ISL81487L and ISL81487E;
CC
A
Unless Otherwise Specified (Continued)
R
= 54Ω, C = 100pF
L
R
= 54Ω, C = 100pF
DIFF
DIFF
L
5
0
5
0
DI
DI
5
0
5
0
RO
RO
4
4
B/Z
A/Y
A/Y
B/Z
3
3
2
1
0
2
1
0
TIME (20ns/DIV)
TIME (20ns/DIV)
FIGURE 16. DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (ISL81487E)
FIGURE 17. DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (ISL81487E)
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP):
GND
TRANSISTOR COUNT:
518
PROCESS:
Si Gate CMOS
FN6051.6
12
ISL8487E, ISL81487L, ISL81487E
Dual-In-Line Plastic Packages (PDIP)
E8.3 (JEDEC MS-001-BA ISSUE D)
N
8 LEAD DUAL-IN-LINE PLASTIC PACKAGE
E1
INDEX
AREA
INCHES
MILLIMETERS
1 2
3
N/2
SYMBOL
MIN
-
MAX
0.210
-
MIN
-
MAX
5.33
-
NOTES
-B-
A
A1
A2
B
4
-A-
D
E
0.015
0.115
0.014
0.045
0.008
0.355
0.005
0.300
0.240
0.39
2.93
0.356
1.15
0.204
9.01
0.13
7.62
6.10
4
BASE
0.195
0.022
0.070
0.014
0.400
-
4.95
0.558
1.77
0.355
10.16
-
-
PLANE
A2
A
-C-
C
-
SEATING
PLANE
L
C
L
B1
C
8, 10
D1
B1
eA
-
A
A
1
D1
e
D
5
eC
C
eB
B
D1
E
5
0.010 (0.25) M
B S
0.325
8.25
6
NOTES:
E1
e
0.280
7.11
5
1. Controlling Dimensions: INCH. In case of conflict between
0.100 BSC
0.300 BSC
2.54 BSC
7.62 BSC
-
English and Metric dimensions, the inch dimensions control.
e
e
6
A
B
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
-
0.430
-
10.92
7
3. Symbols are defined in the “MO Series Symbol List” in Section
2.2 of Publication No. 95.
L
0.115
0.150
2.93
3.81
4
9
4. Dimensions A, A1 and L are measured with the package seated
N
8
8
in JEDEC seating plane gauge GS-3.
Rev. 0 12/93
5. D, D1, and E1 dimensions do not include mold flash or protru-
sions. Mold flash or protrusions shall not exceed 0.010 inch
(0.25mm).
e
6. E and
are measured with the leads constrained to be per-
A
-C-
pendicular to datum
.
7. e and e are measured at the lead tips with the leads uncon-
B
C
strained. e must be zero or greater.
C
8. B1 maximum dimensions do not include dambar protrusions.
Dambar protrusions shall not exceed 0.010 inch (0.25mm).
9. N is the maximum number of terminal positions.
10. Corner leads (1, N, N/2 and N/2 + 1) for E8.3, E16.3, E18.3,
E28.3, E42.6 will have a B1 dimension of 0.030 - 0.045 inch
(0.76 - 1.14mm).
FN6051.6
13
ISL8487E, ISL81487L, ISL81487E
Small Outline Plastic Packages (SOIC)
M8.15 (JEDEC MS-012-AA ISSUE C)
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE
N
INDEX
0.25(0.010)
M
L
B M
H
AREA
INCHES MILLIMETERS
E
SYMBOL
MIN
MAX
MIN
1.35
0.10
0.33
0.19
4.80
3.80
MAX
1.75
0.25
0.51
0.25
5.00
4.00
NOTES
-B-
A
A1
B
C
D
E
e
0.0532
0.0040
0.013
0.0688
0.0098
0.020
-
-
1
2
3
9
SEATING PLANE
A
0.0075
0.1890
0.1497
0.0098
0.1968
0.1574
-
-A-
3
h x 45°
D
4
-C-
0.050 BSC
1.27 BSC
-
α
H
h
0.2284
0.0099
0.016
0.2440
0.0196
0.050
5.80
0.25
0.40
6.20
0.50
1.27
-
e
A1
C
5
B
0.10(0.004)
L
6
0.25(0.010) M
C
A M B S
N
α
8
8
7
NOTES:
0°
8°
0°
8°
-
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of
Rev. 1 6/05
Publication Number 95.
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 0.15mm (0.006
inch) per side.
4. Dimension “E” does not include interlead flash or protrusions. Inter-
lead flash and protrusions shall not exceed 0.25mm (0.010 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. The lead width “B”, as measured 0.36mm (0.014 inch) or greater
above the seating plane, shall not exceed a maximum value of
0.61mm (0.024 inch).
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
FN6051.6
14
相关型号：
ISL81487EIB
【15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
INTERSIL
ISL81487EIB*
【15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
INTERSIL
ISL81487EIB-T
【15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
INTERSIL
ISL81487EIBZ
【15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
INTERSIL
ISL81487EIBZ*
【15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
INTERSIL
ISL81487EIBZ-T
【15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
INTERSIL
ISL81487EIP
【15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
INTERSIL
ISL81487EIPZ
【15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
INTERSIL
ISL81487IB
1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers
INTERSIL
©2020 ICPDF网 联系我们和版权申明