sp331 Exar Corporation, sp331 Datasheet - Page 7

• Manufacturer Part Number: sp331
• Description: Programmable Dual Rs-232/rs-485 Transceiver
• Manufacturer: Exar Corporation

Date: 03-04-05
Figure 9. SP331 Pinout
Figure 10. Typical Operating Circuit
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
0.1µF
0.1µF
0V
0V
21
22
12
11
13
24
26
27
28
19
20
1
8
9
2
C2+
TI1
TI2
TI3
TI4
RX1
RX2
RX3
RX4
C1+
C1-
C2-
SEL A
SEL B
GND
400KΩ
400KΩ
400KΩ
400KΩ
SP331
Vcc
Vcc
Vcc
Vcc
T1
T2
T3
T4
5
VCC
+5V
R2
R3
R4
R1
V+ (VDD)
V– (VSS)
5KΩ
5KΩ
5KΩ
5KΩ
SEL_B
SEL C
SEL D
TX1
TX2
TX3
TX4
GND
RI1
RI2
RI3
RI4
V+
V-
VCC
C1+
C2+
TX4
TX3
TX1
TX2
C1–
C2–
TI4
15
16
17
18
Programmable Dual RS-232/RS-485 Transceiver
10
14
23
7
25
6
4
3
0.1µF
10
11
12
13
14
1
2
3
4
5
6
7
8
9
0.1µF
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232
0V
0V
7
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
28
27
26
25
24
23
22
21
20
19
18
17
16
15
0.1µF
0.1µF
+5V
+5V
TI3
TI2
TI1
SEL_C
SEL_A
SEL_D
RX4
RX3
RX2
RX1
RI4
RI3
RI2
RI1
12
13
11
9
24
26
27
28
19
20
21
22
2
1
8
C1+
C1-
C2+
C2-
SEL A
SEL B
TI1
TI2
TI3
TI4
RX1
RX2
RX3
RX4
GND
400KΩ
400KΩ
Vcc
Vcc
SP331
© Copyright 2005 Sipex Corporation
T1
T3
R1
R3
5
+5V
VCC
15KΩ
15KΩ
SEL C
SEL D
15KΩ
TX2
TX1
TX4
TX3
15KΩ
RI4
RI3
V+
RI2
RI1
V-
10
14
16
15
18
17
7
6
3
4
25
23
0.1µF
0.1µF
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
0V
0V