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SP490

Full Duplex RS-485 Transceivers

Signal Processing Technologies 

®

SP490/SP491

Full Duplex RS-485 Transceivers

FEATURES

■ +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)

Now Available in Lead Free Packaging

DESCRIPTION

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.

BLOCK DIAGRAMS

Vcc 1

8A

R2

R

7B

6Z

D3

D

5Y

GND 4

NC 1

R2

R

REB 3

DE 4

D5

D

GND 6

GND 7

14 Vcc

13 NC

12 A

11 B

10 Z

9Y

8 NC

SP490

SP491

Date: 02/24/05

SP490/491 Full Duplex RS-485 Transceivers

1

© Copyright 2005 Sipex Corporation

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