SP332 Datasheet, PDF (1/11 Pages) Sipex Corporation – RS-232/RS-485 Multi-Mode Serial Transceiver

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 1
SEL_B 2
TX4 3
TX3 4
VCC 5
TX1 6
TX2 7
GND 8
C1+ 9
V+ 10
C2+ 11
C1– 12
C2– 13
V– 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
SP332 ^{12 C1-}
11 _C2+
V+ ¹⁰
V- ¹⁴
13 _C2-
0.1µF
24 _{SEL A}
2 _{SEL B}
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
V+ ¹⁰
SP332 V- ¹⁴
0.1µF
13
C2-
24
2 ^{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