sp488ct-tr Exar Corporation, sp488ct-tr Datasheet - Page 3

• Manufacturer Part Number: sp488ct-tr
• Description: Sp489 -quad Rs-485/rs-422 Line Receivers
• Manufacturer: Exar Corporation

Figure 1. Timing Test Circuit
SP488 PINOUT
Pin 1 — RI
Pin 2 — RI
Pin 3 — RO
ceiver 1 output is enabled, if RI
200mV, Receiver output is high. If Receiver 1
output is enabled, and if RI
Receiver 1 output is low.
Pin 4 — EN — Receiver Output Enable. Please
refer to SP488 Truth Table (1).
Pin 5 — RO
ceiver 2 output is enabled, if RI
200mV, Receiver 2 output is high. If Receiver 2
output is enabled, and if RI
200mV, Receiver 2 output is low.
PINOUT
SP488/489
DI
GND
RI
RI
RI
RI
RO
RO
EN
1
1
2
2
B
A
A
B
1/4 SP486
1
2
DRIVER
1
2
3
4
5
6
7
8
A
B
1
1
B — Receiver 1 input B.
A
2
1
—
— Receiver 1 Output — If Re-
— Receiver 2 Output — If Re-
1
2
Receiver 1 input A.
54
100pF
100pF EN
1
A < RI
1/4 SP488
SP488
RCVR
2
3
4
A < RI
EN
2
1
1
A > RI
A > RI
B by 200mV,
16
15
14
13
12
11
10
9
2
Quad RS-485/RS-422 Line Receivers
B by
V
RI
RI
RO
EN
RO
RI
RI
1
2
B by
B by
CC
ROn
C
4
4
3
3
B
A
A
B
4
3
L
3
Figure 2. Enable/Disable Timing Test Circuit
Pin 6 — RI
Pin 7 — RI
Pin 8 — GND — Digital Ground.
Pin 9 — RI
Pin 10 — RI
Pin 11 — RO
Receiver 3 output is enabled, if RI
200mV, Receiver 3 output is high. If Receiver 3
output is enabled, and if RI
200mV, Receiver 3 output is low.
Pin 12 — EN — Receiver Output Enable. Please
refer to SP488 Truth Table (1).
EN
1
GND
RI
RI
/EN
RI
RI
RO
RO
RCVR
1
1
2
2
B
A
A
B
1
2
2
1
2
3
4
5
6
7
8
2
2
3
A — Receiver 2 input A.
B — Receiver 2 input B.
B — Receiver 3 input B.
3
A — Receiver 3 input A.
1
2
C
3
L
— Receiver 3 Output — If
© Copyright 2000 Sipex Corporation
1k
SP489
3
4
3
S
S
A < RI
1
2
3
A > RI
1k
16
15
14
13
12
11
10
9
3
V
RI
RI
RO
EN
RO
RI
RI
B by
CC
3
4
4
3
3
V
3
B by
B
A
4
3
A
B
/EN
CC
4