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SP332 Datasheet PDF - EXAR

Part Number SP332
Description RS-232/RS-485 Multi-mode SerialTransceiver
Manufacturers EXAR 
Logo EXAR Logo 

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SP332
RS-232/RS-485 Multi-mode SerialTransceiver
• +5V Only Single Supply Operation
• Software Programmable RS-232 or RS-485
Selection
• 4 Drivers, 4 Receivers RS-232
• 2 Drivers, 2 Receivers RS-485
• Loop back function for Self Test
• 28-pin WSOIC package
TI4
SEL_B
TX4
TX3
VCC
TX1
TX2
GND
C1+
V+
C2+
C1–
C2–
V–
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 TI3
27 TI2
26 TI1
25 SD
24 SEL_A
23 LB
22 RX4
21 RX3
20 RX2
19 RX1
18 RI4
17 RI3
16 RI2
15 RI1
DESCRIPTION
The SP332 is a monolithic device that contains both RS-232 and RS-485 line drivers and
receivers. The configuration of the SP332 can be changed at any time by changing the logic
state of two control pins. The device also includes a loop back function which internally con-
nects driver outputs to receiver inputs for a chip self test. An Exar-patended charge pump
allows +5V-only operation.
TYPICAL APPLICATIONS CIRCUIT
0.1µF
0.1µF
0V
0V
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
RS-232 Mode
+5V
9 C1+
5
VCC
SP33212 C1-
11 C2+
V+ 10
V- 14
13 C2-
24 SEL A
2 SEL B
0.1µF
LOOPBACK 23
Vcc
400KΩ
26 TI1
T1
Vcc
TX1 6
400KΩ
27 TI2
T2
Vcc
TX2 7
400KΩ
28 TI3
T3
Vcc
400KΩ
1 TI4
T4
TX3 4
TX4 3
0.1µF
TTL/CMOS
RS-232
RS-232
RS-232
RS-232
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
19 RX1
20 RX2
21 RX3
22 RX4
8 GND
R1 RI1 15
5KΩ
R2 RI2 16
5KΩ
R3 RI3 17
5KΩ
R4 RI4 18
5KΩ
25
SHUTDOWN
RS-232
RS-232
RS-232
RS-232
TTL/CMOS
0.1µF
0.1µF
+5V
+5V
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
Full Duplex RS-485 Mode
+5V
5
9 C1+
12 C1-
11 C2+
VCC
SP332 V+ 10
V- 14
0.1µF
13
24
2
C2-
SEL A
SEL B
Vcc
400KΩ
26 TI1
27 TI2 Vcc
400KΩ
28 TI3
1 TI4
19 RX1
20 RX2
0.1µF
LOOPBACK 23
TTL/CMOS
TX2 7
T1
TX1 6
TX4 3
T3 TX3 4
RI2 16
R1 15KΩ
RI1 15
15KΩ
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
21 RX3
R3
RI4 18
15KΩ
RI3 17
RS-485
RS-485
22 RX4
15KΩ
8 GND
SHUTDOWN 25
TTL/CMOS
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP332_100_012610

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SP332 equivalent
A
VOD
B
R
R VOC
Figure 1. RS-485 Driver DC Test Load Circuit
Test Circuits
Receiver
Output
Test Point
1KΩ
S1 VCC
CRL 1KΩ
S2
Figure 2. Receiver Timing Test Load Circuit
CL1
DI A RDIFF
B
CL2
A
RO
B
15pF
Output
Under
Test CL
500Ω
S1 VCC
S2
Figure 3. RS-485 Driver/Receiver Timing Test Circuit
Figure 4. RS-485 Driver Timing Test Load #2 Circuit
SWITCHING WAVEFORMS
+3V
DRIVER INPUT
0V
DRIVER
OUTPUT
B
A
DIFFERENTIAL VO+
OUTPUT 0V
VA –VB VO
t SKEW = |t DPLH - tDPHL|
f ≥1MHz; tR ≤10ns; tF ≤10ns
1.5V
tPLH
tPHL
VO 1/2VO
tDPLH
tDPHL
tR
1.5V
1/2VO
tF
Figure 5. RS-485 Driver Propagation Delays
VOD2+
A– B
VOD2
VOH
RECEIVER OUT
VOL
tPHL
f = 1MHz; tR ≤10ns ; tF ≤ 10ns
0V INPUT
1.5V
OUTPUT
tPLH
0V
1.5V
Figure 6. RS-485 Receiver Propagation Delays
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP332_100_012610


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