1

Date: 5/11/05

SP1490E/1491E Full Duplex RS-485 Transceivers

© Copyright 2004 Sipex Corporation

SP1490E/SP1491E

Full Duplex RS-485 Transceivers

■ +5V Only

■ Low Power BiCMOS

■ Driver/Receiver Enable (SP1491E)

■ RS-485 and RS-422 Drivers/Receivers

■ Pin Compatible with SN75179

(SP1490E)

■ Pin Compatible with SN75180

(SP1491E)

■ Improved ESD Specifications

±15kV Human Body Model

±15kV IEC1000-4-2 Air Discharge

±8kV IEC1000-4-2 Contact Discharge

SP1490E

SP1491E

®

1

2

3

4

5

6

7

8

VCC

SP1490E

8 Pin - nSOIC

DI

Y

RO

B

A

Z

GND

DESCRIPTION

FEATURES

APPLICATIONS

■ Industial Networks ■ Telecom

■ Motor Control

The SP1490E is a low power differential line driver/receiver meeting RS-485 and RS-422

standards up to 20Mbps. The SP1491E is identical to the SP1490E with the addition of driver

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

over wide common mode range. The SP1490E is available in 8-pin plastic DIP and 8-pin

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

SP1491E is available in 14-pin DIP and 14-pin NSOIC packages for operation over the

commercial and industrial temperature ranges.

BLOCK DIAGRAM

■ HVAC/ Building Control

1

2

3

4

5

6

7

8

R

D

Vcc

GND

RO

DI

A

B

Z

Y

6

1

2

3

4

5

7

8

Vcc

GND

RO

DI

A

B

Z

Y

R

D

9

10

11

12

13

14

NC

REB

DE

GND

NC

NC