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PDF SP331 Data sheet ( Hoja de datos )

Número de pieza SP331
Descripción Programmable Dual RS-232/RS-485 Transceiver
Fabricantes EXAR 
Logotipo EXAR Logotipo



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SP331
Programmable Dual RS-232/RS-485 Transceiver
• +5V Only Operation
• Software Programmable RS-232 or RS-485
Selection
• Four RS-232 Transceivers in RS-232 Mode
• Two RS-485 Full-Duplex Transceivers in
RS-485 Mode
• Two RS-232 Transceivers and One RS-485
Transceiver in Dual Mode
• Self-Testing Loopback Mode
• Full Driver Tri-State (Hi-Z) Control
• Ideal for RS-232 to RS-485 conversion
TI4 1
SEL_B 2
TX4 3
TX3 4
VCC 5
TX1 6
TX2 7
GND 8
C1+ 9
V+ (VDD) 10
C2+ 11
C1– 12
C2– 13
V– (VSS) 14
28 TI3
27 TI2
26 TI1
25 SEL_C
24 SEL_A
23 SEL_D
22 RX4
21 RX3
20 RX2
19 RX1
18 RI4
17 RI3
16 RI2
15 RI1
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 speci-
fications. 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 APPLICATIONS CIRCUIT
0.1µF
0.1µF
+5V
+5V
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
TTL/CMOS
+5V
5
9 C1+
12 C1-
11 C2+
VCC
SP331
10
V+
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
T1
T3
R1
0.1µF
23
SEL D
0V
TX2 7
TX1 6
TX4 3
TX3 4
RI2 16
15KΩ
RI1 15
15KΩ
RS-485
RS-485
RS-485
RS-485
RS-485
RS-485
21 RX3
22 RX4
8 GND
R3
RI4 18
15KΩ
RI3 17
15KΩ
25
SEL C
RS-485
RS-485
0V
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP331_100_012610

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SP331 pdf
SWITCHING WAVEFORMS
+3V
DRIVER INPUT
0V
DRIVER
OUTPUT
B
A
DIFFERENTIAL VO+
OUTPUT 0V
VA –VB VO
t SKEW = |t DPLH - tDPHL|
f ≥1MHz; tR ≤10ns; tF ≤10ns
1.5V
tPLH
tPHL
VO 1/2VO
tDPLH
tDPHL
tR
Figure 4. Driver Propagation Delays
1.5V
1/2VO
tF
+3V
DE
0V
5V
A, B
VOL
VOH
A, B
0V
f = 1MHz; tR < 10ns; tF < 10ns
1.5V
tZL
2.3V Output normally LOW
2.3V Output normally HIGH
tZH
1.5V
tLZ
0.5V
0.5V
tHZ
Figure 5. Driver Enable and Disable Times
VOD2+
A– B
VOD2
f = 1MHz; tR ≤10ns ; tF ≤ 10ns
0V INPUT
VOH
RECEIVER OUT
VOL
tPHL
1.5V
OUTPUT
tPLH
0V
1.5V
Figure 6. Receiver Propagation Delays
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

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SP331 arduino
SP331 CONTROL LOGIC CONFIGURATION (Refer to Table 1)
SEL A 0 0 0 0 0 0 1 1 1 1 1
SEL B 0 0 0 1 1 1 0 0 0 1 1
SEL C 0 0 1 0 0 1 0 0 1 0 0
SEL D 0 1 0 0 1 0 0 1 0 0 1
1
1
1
0
26 TI1
T1
27 TI2
T2
28 TI3
T3
1 TI4
T4
TX1 6
TX2 7
TX3 4
TX4 3
19 RX1
R1
RI1 15
20 RX2 R2 RI2 16
21 RX3 R3 RI3 17
22 RX4 R4 RI4 18
26 TI1
T1
27 TI2
T2
TX1 6
TX2 7
28 TI3
T3
TX3 4
TX4 3
19 RX1 R1 RI1 15
20 RX2 R2 RI2 16
RI3 17
21 RX3
R3 RI4 18
26 TI1
T1
28 TI3
T3
1 TI4
T4
TX1 6
TX2 7
TX3 4
TX4 3
19 RX1
R1
RI1 15
RI2 16
21 RX3 R3 RI3 17
22 RX4
R4
RI4 18
26 TI1
T1
TX1 6
TX2 7
28 TI3
T3
TX3 4
TX4 3
19 RX1
R1
RI1 15
RI2 16
21 RX3
R3
RI3 17
RI4 18
SP331 LOOPBACK (Refer to Table 1)
SEL A
SEL B
SEL C
SEL D
0
0
1
1
0
1
1
1
26 TI1
T1
27 TI2
T2
28 TI3
T3
1 TI4
T4
19 RX1
R1
20 RX2 R2
21 RX3
R3
22 RX4
R4
TX1 6
TX2 7
TX3 4
TX4 3
RI1 15
RI2 16
RI3 17
RI4 18
26 TI1
T1
27 TI2
T2
28 TI3 T3
TX1 6
TX2 7
TX3 4
TX4 3
19 RX1
R1
RI1 15
20 RX2
R2
21 RX3
R3
RI2 16
RI3 17
RI4 18
1
0
1
1
26 TI1 T1
28 TI3
T3
1 TI4
T4
TX1 6
TX2 7
TX3 4
TX4 3
19 RX1
R1
21 RX3
R3
22 RX4
R4
RI1 15
RI2 16
RI3 17
RI4 18
1
1
1
1
26 TI1 T1
28 TI3
T3
TX1 6
TX2 7
TX3 4
TX4 3
19 RX1
R1
RI1 15
RI2 16
21 RX3
R3
RI3 17
RI4 18
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
11
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