SP334CT-L-TR Datasheet, PDF (1/14 Pages) Exar Corporation – Programmable RS-232/RS-485 Transceiver

SP334
Programmable RS-232/RS-485 Transceiver
• +5V Single Supply Operation
• Software Programmable RS-232 or RS-485
Selection
• Three RS-232 Drivers and Five Receivers
in RS-232 Mode
• Two RS-485 Full-Duplex Transceivers in
RS-485 Mode
• Full Differential Driver Tri-State (Hi-Z) Control
• Receiver Output Tri-State Control
TI3 1
TXEN(n/c) 2
TX4(n/c) 3
TX3 4
VCC 5
TX1 6
TX2 7
GND 8
C1+ 9
V+ 10
C2+ 11
C1– 12
C2– 13
V– 14
SP334
28 TI2
27 TI1
26 RXEN
25 RS232/RS485
24 RI5
23 RX5
22 RX4
21 RX3
20 RX2
19 RX1
18 RI4
17 RI3
16 RI2
15 RI1
(in RS-232 Mode)
DESCRIPTION
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.
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.
0.1µF
0.1µF
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TYPICAL APPLICATIONS CIRCUIT
+5V
9 _C1+
12 _C1-
11 _C2+
13
C2-
5
VCC
SP334
10
V+
14
V-
0.1µF
0.1µF
2 TXEN
Vcc
400KΩ
27 TI1
T1
Vcc
400KΩ
1 TI3
T3
TX2 7
TX1 6
TX4 3
TX3 4
19 RX1
R1
RI1 15
15KΩ
RI2 16
15KΩ
21 RX3
R3
RI4 18
15KΩ
RI3 17
26
15KΩ
RXEN
8 _GND
25
RS232/ RS485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
+5V
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP334_100_090909