sp331 Exar Corporation, sp331 Datasheet - Page 11

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sp331

Manufacturer Part Number
sp331
Description
Programmable Dual Rs-232/rs-485 Transceiver
Manufacturer
Exar Corporation
Datasheet

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Date: 03-04-05
SP331 LOOPBACK (Refer to Table 1)
SP331 CONTROL LOGIC CONFIGURATION (Refer to Table 1)
SEL A
SEL B
SEL C
SEL D
SEL A
SEL B
SEL C
SEL D
22
26
27
28
19
21
20
22
1
26
27
28
19
21
20
1
0
0
0
0
TI1
TI2
TI3
TI4
RX1
RX2
RX3
RX4
TI1
TI2
TI3
TI4
RX1
RX2
RX3
RX4
T1
T2
T3
T4
R2
R3
R1
R4
T1
T2
T3
T4
R2
R3
R1
R4
0
0
0
1
0
0
1
1
TX1 6
TX3 4
TX4
TX1
TX3
TX4
TX2 7
TX2
RI1
RI2
RI3
RI4
RI1
RI2
RI3
RI4
0
0
1
0
15
16
17
18
17
18
3
15
16
7
6
4
3
Programmable Dual RS-232/RS-485 Transceiver
26
28
19
27
20
21 RX3
27
19
20
26
28 TI3
21 RX3
0
1
0
0
TI1
TI2
TI3
RX1
RX2
RX2
TI1
TI2
RX1
T3
T1
T2
T3
T1
T2
R1
R3
R2
R1
R3
0
1
1
1
0
1
0
1
R2
11
TX1 6
TX3
TX4
TX2 7
RI1
RI3
RI4
TX1 6
TX2 7
TX3
TX4
RI2 16
RI1
RI2 16
RI3
RI4
0
1
1
0
15
18
17
15
18
4
3
17
4
3
26
28
19
19
21
22
26
28
21
22
1
1
1
0
0
0
TI1
TI3
TI4
RX1
RX3
RX4
RX4
TI1
TI3
TI4
RX1
RX3
T1
T3
T4
R1
R3
R4
T1
T3
T4
R1
R3
R4
1
0
0
1
1
0
1
1
TX3
TX4
TX3
TX1
TX2
TX1
TX2
TX4
RI1
RI1
RI2
RI3
RI4
RI3
RI4
RI2
1
0
1
0
15
16
15
16
17
18
17
18
4
3
7
4
3
© Copyright 2005 Sipex Corporation
7
6
6
26
28
19
21 RX3
26
28
21 RX3
19
1
0
1
0
TI1
RX1
TI3
RX1
TI3
TI1
T3
T1
R1
R3
T3
T1
R1
R3
1
1
0
1
1
1
1
1
TX1
TX2
TX3
TX4
TX2
TX1
TX3
TX4
RI1
RI2
RI3
RI4
RI1
RI3
RI4
RI2
1
1
1
0
15
16
6
7
17
18
15
16
18
4
6
7
17
3
4
3

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