1

Date: 05/10/04

SP490/491 Full Duplex RS-485 Transceivers

© Copyright 2004 Sipex Corporation

SP490/SP491

Full Duplex RS-485 Transceivers

■ +5V Only

■ Low Power BiCMOS

■ Driver/Receiver Enable (SP491)

■ RS-485 and RS-422 Drivers/Receivers

■ Pin Compatible with LTC490 and

SN75179 (SP490)

■ Pin Compatible with LTC491 and

SN75180 (SP491)

The SP490 is a low power differential line driver/receiver meeting RS-485 and RS-422

standards up to 5Mbps. The SP491 is identical to the SP490 with the addition of driver and

receiver tri-state enable lines. Both products feature ±200mV receiver input sensitivity, over

wide common mode range. The SP490 is available in 8-pin plastic DIP and 8-pin NSOIC

packages for operation over the commercial and industrial temperature ranges. The SP491

is available in 14-pin DIP and 14-pin NSOIC packages for operation over the commercial and

industrial temperature ranges.

6

1

2

3

4

5

7

8

Vcc

GND

R

D

A

B

Z

Y

R

D

9

10

11

12

13

14

NC

REB

DE

GND

NC

NC

1

2

3

4

5

6

7

8

R

D

Vcc

GND

R

D

A

B

Z

Y

SP490

SP491

®

DESCRIPTION

BLOCK DIAGRAMS