3

SP488/489

Quad RS-485/RS-422 Line Receivers

© Copyright 2000 Sipex Corporation

A

B

54

Ω

100pF

DI

1/4 SP486

1/4 SP488

100pF EN

EN

ROn

DRIVER

RCVR

Figure 1. Timing Test Circuit

RCVR

1k

Ω

1k

Ω

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

by

200mV, Receiver 3 output is low.

Pin 12 — EN — Receiver Output Enable. Please

refer to SP488 Truth Table (1).

SP488 PINOUT

Pin 1 — RI

Pin 2 — RI

Pin 3 — RO

ceiver 1 output is enabled, if RI

by

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

by

200mV, Receiver 2 output is high. If Receiver 2

output is enabled, and if RI

by

200mV, Receiver 2 output is low.

SP488

EN

GND

EN

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1

4

3

2

SP489

GND

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1

4

3

2

PINOUT