C2鈥?/div>
V鈥?(VSS)
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
TI2
TI1
SEL_C
SEL_A
SEL_D
RX4
RX3
RX2
RX1
RI4
RI3
RI2
RI1
Now Available in Lead Free Packaging
DESCRIPTION
The SP331 is a programmable RS-232 and/or RS-485 transceiver IC. The SP331 contains four
drivers and four receivers when selected in RS-232 mode; and two drivers and two receivers
when selected in RS-485 mode. The SP331 also contains a dual mode which has two RS-232
drivers/receivers plus one differential RS-485 driver/receiver.
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 SP331 includes a self-test loopback mode where the driver outputs are
internally configured to the receiver inputs. This allows for easy diagnostic serial port testing
without using an external loopback plug. The RS-232 and RS-485 drivers can be disabled
(High-Z output) by controlling a set of four select pins.
TYPICAL APPLICATION CIRCUITS
+5V
5
9
0.1碌F
0.1碌F
+5V
+5V
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
C1+
VCC
12 C1-
11
C2+
13
C2-
24
SEL A
2
SEL B
400K鈩?/div>
SP331
SP331
V+
V-
10
14
0.1碌F
0.1碌F
SEL D
23
0V
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
Vcc
TX2 7
T1
TX1 6
TX4 3
T3
TX3 4
RI2 16
R1
15K鈩?/div>
26 TI1
27
TI2
Vcc
400K鈩?/div>
28 TI3
1
TI4
19 RX1
20
RX2
RI1 15
15K鈩?/div>
21 RX3
RI4 18
R3
15K鈩?/div>
RI3 17
15K鈩?/div>
22
RX4
8 GND
SEL C
25
0V
Date: 03-04-05
Programmable Dual RS-232/RS-485 Transceiver
漏 Copyright 2005 Sipex Corporation
1
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