SP489A Sipex, SP489A Datasheet - Page 5

• Manufacturer Part Number: SP489A
• Description: High Speed Quad RS-485/RS-422 Line Receivers
• Manufacturer: Sipex

Figure 3. Timing Test Circuit
SP489A 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 — EN1/EN2 — Receiver 1 and 2 Output
Enable. Please refer to SP489A Truth Table (2).
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.
Pin 6 — RI
Pin 7 — RI
Pin 8 — GND — Digital Ground.
SP488A/489ADS/07
DI
1/4 SP486
DRIVER
A
B
1
1
2
2
B — Receiver 1 input B.
A — Receiver 1 input A.
A — Receiver 2 input A.
B — Receiver 2 input B.
2
1
— Receiver 1 Output — If Re-
— Receiver 2 Output — If Re-
54
50pF
1
50pF EN
A < RI
SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
1/4 SP488
RCVR
2
A < RI
EN
2
1
1A
A > RI
B by 200mV,
> RI
2
B by
1
2
B by
B by
ROn
C
L
5
Figure 4. Enable/Disable Timing Test Circuit
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 — EN3/EN4 — Receiver 3 and 4 Output
Enable. Please refer to SP489A Truth Table (2).
Pin 13 — RO
Receiver 4 output is enabled, if RI
200mV, Receiver 4 output is high. If Receiver 4
output is enabled, and if RI
200mV, Receiver 4 output is low.
Pin 14 — RI
Pin 15 — RI
Pin 16 — Supply Voltage V
5.25V.
RCVR
3
B — Receiver 3 input B.
3
4
4
A — Receiver 3 input A.
A — Receiver 4 input A.
B — Receiver 4 input B.
C
3
4
L
— Receiver 3 Output — If
— Receiver 4 Output — If
© Copyright 2000 Sipex Corporation
1k
CC
— 4.75V V
3
4
S
S
A < RI
A < RI
1
2
3
4
A > RI
A > RI
1k
3
4
B by
B by
3
4
V
B by
B by
CC
CC