SP334CT-L/TR [EXAR]
Line Transceiver, 2 Func, 2 Driver, 2 Rcvr, PDSO28, WSOIC-28;
| 型号： | SP334CT-L/TR |
| 厂家： | 
EXAR CORPORATION |
| 描述： | Line Transceiver, 2 Func, 2 Driver, 2 Rcvr, PDSO28, WSOIC-28 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总13页 (文件大小：520K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SP334
Programmable RS-232/RS-485 Transceiver
Description
FEATURES
The SP334 is a programmable RS-232 and/or RS-485 transceiver IC.
The SP334 contains three drivers and five receivers when selected
in RS-232 mode; and two drivers and two receivers when selected in
RS-485 mode.
ꢀ■
+5V Single Supply Operation
Software Programmable RS-232 or
RS-485 Selection
ꢀ■
ꢀ■
ꢀ■
ꢀ■
ꢀ■
Three RS-232 Drivers and Five Receivers
in RS-232 Mode
The RS-232 transceivers can typically operate at 230kbps
while adhering to the RS-232 specifications. The RS-485
transceivers can operate up to 10Mbps while adhering to the
RS-485 specifications. The RS-485 drivers can be disabled
(High-Z output) by the TXEN enable pin. The RS-232 and RS-485
receiver outputs can be disabled by the RXEN pin.
Two RS-485 Full-Duplex Transceivers in
RS-485 Mode
Full Differential Driver Tri-State (Hi-Z)
Control
Receiver Output Tri-State Control
Ordering Information - Back Page
Typical Applications Circuit
+5V
5
VCC
9
C1+
0.1µF
10
14
0.1µF
0.1µF
12
11
V+
C1-
SP334 V-
C2+
13
0.1µF
C2-
TXEN
2
TTL/CMOS
TTL/CMOS
Vcc
7
TX2
400KΩ
RS-485
27 TI1
T1
6
3
TX1
TX4
RS-485
RS-485
Vcc
400KΩ
TI3
1
T3
R1
TTL/CMOS
TTL/CMOS
4
TX3
RS-485
RS-485
RI1 15
RX1
19
15KΩRI2 16
RS-485
15KΩ
RI4 18
RS-485
RS-485
21 RX3
26
15KΩ
TTL/CMOS
TTL/CMOS
R3
RI3 17
15KΩ
RXEN
25
+5V
RS232/ RS485
8
GND
REV 1.0.1
1/13
SP334
Absolute Maximum Ratings
These are stress ratings only and functional operation of the
device at these ratings or any other above those indicated
in the operation sections of the specifications below is not
implied. Exposure to absolute maximum rating conditions
for extended periods of time may affect reliability.
Storage Temperature .................................-65˚C to +150˚C
Power Dissipation
28-pin WSOIC .............................1000mW
Package Derating
V
CC
................................................................................+7V
28-pin WSOIC
Input Voltages
Ѳ
................................................ 40˚C/W
Jꢂ
NOTE:
Logic........................ -0.5V to (V + 0.5V)
CC
1. Exceeding the maximum data rate of 8Mbps at Tꢂ = 85˚C may permanently
damage the device.
Drivers ..................... -0.5V to (V + 0.5V)
CC
Receivers........................ 30V ꢀ ꢁ100mꢂ
Driver Outputs ............................................................. 15V
Maximum Data Rate...............................................8Mbps(1)
Electrical Characteristics
Limits are specified at T = 25°C and V = +5.0V unless otherwise noted.
ꢂ
CC
PꢂRꢂMETER
Logic Inputs
MIN.
TYP.
MꢂX.
UNITS
CONDITIONS
V
0.8
V
V
IL
V
IH
2.0
2.4
Logic Outputs
V
OL
0.4
V
V
I
I
= -3.2mA
= 1.0mA
OUT
OUT
V
OH
Output Tri-state Leakage
RS-232 Driver
10
µA
0.4V ≤ V
≤ +2.4V
OUT
DC Characteristics
HIGH Level Output
LOW Level Output
Open Circuit Voltage
Short Circuit Current
Power Off Impedance
AC Characteristics
Slew Rate
+5.0
-15.0
-15
+15.0
-5.0
V
V
R = 3kΩ, V = 0.8V
L IN
R = 3kΩ, V = 2.0V
L
IN
+15
V
100
mA
Ω
V = 0V
OUT
300
V
CC
= 0V, V
= 2.0V
OUT
30
V/µs
µs
R = 3kΩ, C = 50pF; V = +5.0V, T @ 25°C
L L CC A
R = 3kΩ, C = 2500pF; between 3V,
L
L
Transistion Time
1.56
T @ +25°C
A
Maximum Data Rate
120
235
2
kbps
µs
R = 3kΩ, C = 2500pF
L L
Propagation Delay t
Propagation Delay t
RS-232 Receiver
8
8
PHL
PLH
Measured from 1.5V of V to 50% of V
R = 3kΩ
L
;
IN
OUT
2
µs
DC Characteristics
HIGH Threshold
1.7
1.2
3.0
V
V
LOW Threshold
0.8
3
Receiver Open Circuit Bias
Input Impedance
+2.0
V
5
7
kΩ
V
= +15V to -15V
IN
REV 1.0.1
2/13
SP334
Electrical Characteristics (Continued)
Limits are specified at T = 25°C and V = +5.0V unless otherwise noted.
ꢂ
CC
PꢂRꢂMETER
MIN.
TYP.
MꢂX.
UNITS
CONDITIONS
RS-232 Receiver (Continued)
AC Characteristics
Maximum Data Rate
120
235
0.25
0.25
kbps
µs
Propagation Delay t
Propagation Delay t
RS-485 Driver
1
1
PHL
PLH
Measured from 50% of V to 1.5V of V
IN
OUT
µs
DC Characteristics
Open Circuit Voltage
Differential Output
Balance
6.0
5.0
0.2
3.0
V
V
1.5
R = 54Ω, C = 50pF
L
L
V
|V | - |ꢀT|
T
Common-Mode Output
Output Current
V
28.0
10
mA
mA
R = 54Ω
L
Short Circuit Current
AC Characteristics
Maximum Data Rate
Maximum Data Rate
Output Transition Time
250
Terminated in -7V to +10V
Mbps
Mbps
ns
R = 54Ω
L
8
R = 54Ω , T = +85°C(1)
L
A
30
80
80
5
Rise/Fall time, 10% - 90%
Propagation Delay t
Propagation Delay t
Driver Output Skew
Enable Timing
120
120
20
ns
PHL
PLH
See Figures 3 & 5, R = 54Ω,
DIFF
C
L1
= C = 100pF
L2
ns
ns
Per Figure 5, t
= |t
- t
|
SKEW
DPHL DPLH
Enable Time (see Figures 4 and 6)
Enable to LOW
100
100
150
150
ns
ns
C = 15pF, S Closed
L 1
Enable to HIGH
C = 15pF, S Closed
L 2
Disable Time (see Figures 4 and 6)
Disable from LOW
100
100
120
120
ns
ns
C = 15pF, S Closed
L 1
Disable from HIGH
C = 15pF, S Closed
L
2
RS-485 Receiver
DC Characteristics
Common Mode Range
Receiver Sensitivity
Input Impedance
-7.0
12
+12
V
V
0.2
-7V ≤ V
-7V ≤ V
≤ +12V
≤ +12V
CM
15
kΩ
CM
AC Characteristics
Maximum Data Rate
Maximum Data Rate
10
Mbps
Mbps
ns
8
T = +85°C(1)
A
Propagation Delay t
Propagation Delay t
130
130
200
200
PHL
PLH
See Figures 3 & 7, R
= 54Ω,
DIFF
C
L1
= C = 100pF
L2
ns
t
C
= |t
- t
|, R
= 54Ω,
SKEW
PHL PLH
DIFF
Differential Receiver Skew
10
20
ns
= C = 100pF, see Figure 8
L1
L2
REV 1.0.1
3/13
SP334
Electrical Characteristics, Continued
Limits are specified at T = 25°C and V = +5.0V unless otherwise noted.
ꢂ
CC
PꢂRꢂMETER
MIN.
TYP.
MꢂX.
UNITS
CONDITIONS
RS-485 Receiver (Continued)
Enable Timing
Enable Time (see Figures 2 and 8)
Enable to LOW
100
100
150
150
ns
ns
C = 15pF, S Closed
L 1
Enable to HIGH
C = 15pF, S Closed
L 2
Disable Time (see Figures 2 and 8)
Disable from LOW
100
100
120
120
ns
ns
C = 15pF, S Closed
L 1
Disable from HIGH
C = 15pF, S Closed
L
2
Power Requirements
Supply Voltage V
+4.75
+5.25
V
CC
Supply Current I
CC
No Load (T Disabled)
12
20
15
20
50
50
mA
mA
mA
TXEN = 0V
X
No Load (RS-232 Mode)
No Load (RS-485 Mode)
Environmental
RS232/RS485 = 0V
RS232/RS485 = +5V
Operating Temperature
Commercial (_C_)
0
70
ºC
ºC
ºC
Industrial (_E_)
-40
-65
+85
Storage Temperature
+150
NOTE:
1. Exceeding the maximum data rate of 8Mbps at Tꢂ = 85˚C may permanently damage the device.
REV 1.0.1
4/13
SP334
Receiver Input Graph
RS-485 RECEIVER
+1.0mA
+12V
-7V
-3V
+6V
1 Unit Load
Maximum Input Current
Versus Voltage
-0.6mA
Test Circuits
1kΩ
Test Point
1kΩ
Receiver
Output
V
CC
R
R
S
1
VOD
D
C
RL
VOC
Vcc
S
2
Figure 1. Driver DC Test Load Circuit
Figure 2. Receiver Timing Test Load Circuit
CL1
A
A
DI
V
CC
RL
RO
S
1
500Ω
B
B
Output
Under
Test
CL2
15pF
C
L
S
2
Figure 4. Driver Timing Test Load #2 Circuit
Figure 3. Driver / Receiver Timing Test Circuit
REV 1.0.1
5/13
SP334
Switching Waveforms
f ≥1MHz; tR ≤ 10ns; tF ≤ 10ns
1.5V
+3V
1.5V
DRIVER INPUT
0V
B
tPLH
tPHL
1/2VO
1/2VO
DRIVER
OUTPUT
VO
A
tDPLH
tDPHL
+
VO
DIFFERENTIAL
OUTPUT
0V
–
VO
VA –VB
tF
tR
tSKEW= |tDPLH-tDPHL
|
Figure 5. Driver Propagation Delays
f = 1MHz; tR< 10ns; tF < 10ns
+3V
1.5V
tZL
1.5V
TXEN
0V
tLZ
5V
A,B
2.3V
Output normally LOW
0.5V
0.5V
VOL
VOH
A,B
0V
Output normally HIGH
2.3V
tZH
tHZ
Figure 6. Driver Enable and Disable Times
f = 1MHz; t
1.5V
; t
R ≤10ns F ≤ 10ns
+
–
VOD2
VOD2
0V
0V
A – B
INPUT
VOH
RECEIVER OUT
VOL
1.5V
OUTPUT
tPHL
tPLH
Figure 7. Receiver Propagation Delays
REV 1.0.1
6/13
SP334
Switching Waveforms (Continued)
+3V
1.5V
1.5V
RXEN
f = 1MHz; t ≤ 10ns; t ≤ 10ns
R
F
0V
t
t
LZ
ZL
5V
1.5V
RECEIVER OUT
Output normally LOW
Output normally HIGH
0.5V
0.5V
V
IL
V
IH
RECEIVER OUT
1.5V
0V
t
t
HZ
ZH
t
= |t
-t
|
SKEW
PHL PLH
Figure 8. Receiver Enable and Disable Times
TTL
Input
TTL
INPUT
Driver Output
A
Driver Output B
DRIVER
OUTPUT
Differential
Output
VA -VB
Figure 9. Typical RS-232 Driver Output
Figure 10. Typical RS-485 Driver Output
REV 1.0.1
7/13
SP334
Pinout
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
TI3
TXEN(n/c)
TX4(n/c)
TX3
TI2
TI1
RXEN
RS232/RS485
RI5
VCC
TX1
TX2
RX5
RX4
RX3
RX2
RX1
RI4
SP334
GND
C1+
V+
C2+
C1–
RI3
C2–
RI2
V–
RI1
(in RS-232 Mode)
Figure 11. SP334 Pinout
Typical Operating Circuits
+5V
5
VCC
9
C1+
+5V
0.1µF
0V
0.1µF
0.1µF
12
11
10
C1-
C2+
V+
SP334
5
VCC
14
0.1µF
V-
9
C1+
13
0.1µF
10
14
C2-
0.1µF
0.1µF
12
11
V+
C1-
SP334 V-
25
C2+
RS232/RS485
0V
13
0.1µF
C2-
Vcc
400KΩ
TXEN
2
TX1
6
7
27 TI1
RS-232
RS-232
RS-232
TTL/CMOS
TTL/CMOS
T1
T2
TTL/CMOS
Vcc
Vcc
Vcc
7
TX2
400KΩ
400KΩ
RS-485
27 TI1
28 TI2
TX2
TX3
T1
TTL/CMOS
TTL/CMOS
6
3
TX1
TX4
RS-485
RS-485
Vcc
400KΩ
TI3
400KΩ
1
2
TI3
4
3
T3
1
T3
R1
TTL/CMOS
TTL/CMOS
4
TX3
RS-485
RS-485
N/C
N/C
RI1 15
RX1
19
15KΩRI2 16
19 RX1
20 RX2
21 RX3
RI1 15
RS-485
TTL/CMOS
R1
RS-232
RS-232
RS-232
15KΩ
5KΩ
5KΩ
RI4 18
RI2
16
RS-485
RS-485
21 RX3
26
TTL/CMOS
TTL/CMOS
R2
R3
15KΩ
TTL/CMOS
TTL/CMOS
R3
RI3 17
RI3 17
RI4 18
15KΩ
5KΩ
5KΩ
RXEN
25
+5V
RS232/ RS485
8
22 RX4
GND
TTL/CMOS
TTL/CMOS
R4
R5
RS-232
RS-232
23
RX5
RI5 24
5KΩ
26
0V
8
RXEN
GND
Figure 12. Typical Operating Circuits
REV 1.0.1
8/13
SP334
Theory of Operation
The SP334 is made up of four separate circuit blocks: the
charge pump, drivers, receivers, and decoder. Each of
these circuit blocks is described in more detail below.
External Power Supplies
For applications that do not require +5V only, external
supplies can be applied at the V+ and V– pins. The value of
the external supply voltages must be no greater than 10V.
The current drain for the 10V supplies is used for RS-232.
For the RS-232 driver the current requirement will be 3.5mꢂ
per driver. The external power supplies should provide a
power supply sequence of :+10V, then +5V, followed by
-10V.
Charge-Pump
The charge pump is an Exar–patented design (U.S.
5,306,954) and uses a unique approach compared to older
less efficient designs. The charge pump still requires four
external
capacitors,
but
uses
a
four-phase
voltage shifting technique to attain symmetrical
10V power supplies. Figure 17(a) shows the
waveform found on the positive side of capacitor C2, and
Figure 17(b) shows the negative side of capacitor C2. There
is a free–running oscillator that controls the four phases of
the voltage shifting. ꢂ description of each phase follows.
V
= +5V
CC
C
+5V
4
+
–
+
V
V
Storage Capacitor
Storage Capacitor
DD
+
–
+
–
C
C
2
1
–
SS
C
Phase 1: V Charge Storage
–5V
–5V
3
SS
During this phase of the clock cycle, the positive side of
+
capacitors C and C are initially charged to +5V. C is
1
2
1
Figure 13. Charge Pump Phase 1
–
then switched to ground and charge on C is transferred
1
to C . Since C + is connected to +5V, the voltage potential
–
2
2
across capacitor C is now 10V.
2
V
= +5V
CC
Phase 2: V Transfer
SS
Phase two of the clock connects the negative terminal of
C
4
+
–
+
C to the V storage capacitor and the positive terminal
V
V
Storage Capacitor
Storage Capacitor
2
SS
DD
SS
+
–
+
–
of C to ground, and transfers the generated -10V to C .
C
C
2
2
3
1
–
Simultaneously, the positive side of capacitor C is switched
1
C
–10V
3
to +5V and the negative side is connected to ground.
Phase 3: V Charge Storage
The third phase of the clock is identical to the first phase;
DD
Figure 14. Charge Pump Phase 2
the charge transferred in C produces -5V in the negative
1
terminal of C , which is applied to the negative side of
1
V
= +5V
+
CC
capacitor C . Since C is at +5V, the voltage potential
2
2
across C is 10V.
2
C
+5V
4
Phase 4: V Transfer
The fourth phase of the clock connects the negative
DD
+
–
+
V
V
Storage Capacitor
Storage Capacitor
DD
+
–
+
–
C
C
2
1
–
terminal of C to ground and transfers the generated
2
SS
10V across C to C , the V storage capacitor. ꢂgain,
C
–5V
–5V
2
4
DD
3
simultaneously with this, the positive side of capacitor C
1
is switched to +5V and the negative side is connected to
ground, and the cycle begins again.
Figure 15. Charge Pump Phase 3
Since both V+ and V– are separately generated from V in
CC
a no–load condition, V+ and V– will be symmetrical. Older
charge pump approaches that generate V– from V+ will
show a decrease in the magnitude of V– compared to V+
due to the inherent inefficiencies in the design.
V
= +5V
CC
C
+10V
4
+
–
+
V
V
Storage Capacitor
Storage Capacitor
DD
SS
+
+
–
The clock rate for the charge pump typically operates at
15kHz. The external capacitors must be 0.1µF with a 16V
breakdown rating.
C
C
2
1
–
–
C
3
Figure 16. Charge Pump Phase 4
REV 1.0.1
9/13
SP334
+10V
a) C2+
GND
GND
b) C2-
-10V
Figure 17. Charge Pump Waveforms
Receivers
Drivers
The SP334 has five single-ended receivers when
programmed for RS-232 mode and two differential receivers
when programmed for RS-485 mode.
The SP334 has three independent RS-232 single-ended
drivers and two differential RS-485 drivers. Control for
the mode selection is done by the RS232/RS485 select
pin. The drivers are pre-arranged such that for each mode
of operation the relative position and functionality of the
drivers are set up to accommodate the selected interface
mode. As the mode of the drivers is changed, the electrical
characteristics will change to support the requirements of
clock, data, and control line signal levels. Unused driver
inputs can be left floating; however, to ensure a desired
state with no input signal, pull–up resistors to +5V or pull–
down resistors to ground are suggested. Since the driver
inputs are both TTL or CMOS compatible, any value resistor
less than 100kΩ will suffice.
Control for the mode selection is done the same select
pin as in the drivers. ꢂs the operating mode of the
receivers is changed, the electrical characteristics will
change to support the requirements of the appropriate
serial standard. Unused receiver inputs can be left floating
without causing oscillation. To ensure a desired state of
the receiver output, a pull–up resistor of 100kΩ to +5V
should be connected to the inverting input for a logic low,
or the non–inverting input for a logic high. For single-ended
receivers, a pull–down resistor to ground of 5kΩ is internally
connected, which will ensure a logic high output.
When in RS-232 mode, the single-ended RS-232 drivers
produce compliant RS-232E and ITU V.28 signals. Each
of the three drivers output single-ended bipolar signals in
excess of 5V with a full load of 3kΩ and 2500pF applied as
specified. These drivers can also operate at least 120kbps.
The RS-232 receiver has a single–ended input with a
threshold of 0.8V to 2.4V. The RS-232 receiver has an
operating voltage range of 15V and can receive signals up
to 120kbps. RS-232 receivers are used in RS-232 mode for
all signal types include data, clock, and control lines of the
RS-232 serial port.
When programmed to RS-485 mode, the differential RS-485
drivers produce complaint RS-485 signals. Each RS-485
driver outputs a unipolar signal on each output pin with a
magnitude of at least 1.5V while loaded with a worst case of
54Ω between the driver’s two output pins. The signal levels
and drive capability of the RS-485 drivers allow the drivers
to also comply with RS-422 levels. The transmission rate
for the differential drivers is 10Mbps.
The differential RS-485 receiver has an input impedance
of 15kΩ and a differential threshold of 200mV. Since the
characteristics of an RS-422 receiver are actually subsets of
RS-485, the receivers for RS-422 requirements are identical
to the RS-485 receivers. ꢂll of the differential receivers can
receive data up to 10Mbps.
REV 1.0.1
10/13
SP334
Enable Pins
ꢂpplications
The SP334 drivers can be enabled by use of the TXEN pin.
ꢂ logic HIGH will enable the driver outputs and a logic LOW
will tri-state the outputs. The drivers can only be tri-stated
in RS-485 mode. The drivers are always active in RS-232
mode.
The SP334 allows the user flexibility in having a RS-232
or RS-485 serial port without using two different discrete
active IC’s. Figure 18 shows a connection to a standard
DB-9 RS-232 connector. In RS-485 mode, the SP334 is a
full duplex transceiver, however, a half duplex configuration
can be made by connecting the driver outputs to receiver
inputs.
The Receiver outputs can also be tri-stated by the use of the
RXEN pin. ꢂ logic LOW will enable the receiver outputs and
a logic HIGH will tri-state the outputs. The receiver tri-state
capability is offered for both RS-232 and RS-485 modes.
The input impedance of the receivers during tri-state is at
least 12kΩ.
+5V
5
VCC
9
C1+
0.1µF
0V
0.1µF
0.1µF
12
11
10
14
C1-
V+
V-
SP334
C2+
13
C2-
0.1µF
25
RS232/RS485
0V
Vcc
400KΩ
TX1
TX2
TX3
6
7
4
27 TI1
T1
T2
TxD
Vcc
Vcc
400KΩ
28 TI2
RTS
DTR
400KΩ
1
1
TI3
DCD
T3
DSR
6
RxD
RTS
19 RX1
20 RX2
RI1 15
RI2 16
RI3 17
RxD
R1
5KΩ
5KΩ
TxD
CTS
CTS
DSR
R2
R3
DTR
21 RX3
22 RX4
RI
5KΩ
5KΩ
9
RI4 18
RI5 24
SG
DCD
RI
R4
R5
23
8
RX5
5
5KΩ
26
0V
RXEN
GND
Figure 18. SP334 Configuration to a DB-9 Serial Port
REV 1.0.1
11/13
SP334
Mechanical Dimensions
WSOIC28
Top View
Side View
Front View
Drawing No: POD-00000106
Revision:
B
REV 1.0.1
12/13
SP334
Ordering Information(1)
Part Number
Operating Temperature Range
Lead-Free
Package
Packaging Method
SP334CT-L
Tube
Reel
Tube
Reel
0°C to 70°C
SP334CT-L/TR
SP334ET-L
Yes(2)
28-pin WSOIC
-40°C to 85°C
SP334ET-L/TR
NOTE:
1. Refer to www.exar.com/SP334 for most up-to-date Ordering Information.
2. Visit www.exar.com for additional information on Environmental Rating.
Revision History
Revision
Date
Description
2000
SP334/10
Legacy Sipex Datasheet
Convert to Exar Format. Add typical application circuit to page 1 and Revision History table.
Remove EOL part numbers and update ordering information per PDN 081126-01. Change
revision to 1.0.0. Add Maximum Data Rate to Absolute Maximum Ratings. Add RS-485 Driver
and Receiver data rate column for 8Mbps maximum at Tmax and add Note 1.
09/09/09
03/19/18
1.0.0
1.0.1
Update to MaxLinear logo. Update format and ordering information table. RS-485 Enable
Timing moved on page 3.
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San Jose, Cꢂ 95131
Tel.: +1 (669) 265-6100
Fax: +1 (669) 265-6101
Email: serialtechsupportꢀexar.com
www.exar.com
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© 2009 - 2018 MaxLinear, Inc. All rights reserved
REV 1.0.1
SP334_DS_031918
13/13
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