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SP334 Datasheet PDF - EXAR

Part Number SP334
Description Programmable RS-232/RS-485 Transceiver
Manufacturers EXAR 
Logo EXAR Logo 

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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
Vcc
400KΩ
1 TI3
19 RX1
21 RX3
26
RXEN
8 GND
TX2 7
T1
TX1 6
TX4 3
T3
TX3 4
RI1 15
R1 15KΩ RI2 16
15KΩ
RI4 18
R3 15KΩ
RI3 17
15KΩ
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

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SP334 equivalent
RECEIVER INPUT GRAPH
RS-485 RECEIVER
+1.0mA
-7V -3V
-0.6mA
+6V +12V
1 Unit Load
Maximum Input Current
Versus Voltage
A
VOD
B
R
R VOC
Figure 1. 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 RL
B
CL2
A
RO
B
15pF
Figure 3. Driver/Receiver Timing Test Circuit
Output
Under
Test CL
500Ω
S1 VCC
S2
Figure 4. Driver Timing Test Load #2 Circuit
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP334_100_090909


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