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SP485R

1/10th Unit Load RS-485 Transceiver

Signal Processing Technologies 

®

SP481R/SP485R

1/10th Unit Load RS-485 Transceiver

FEATURES

■ Allows Over 400 Transceivers On A

Transmission Line (1/10th Unit Load)

■ High Impedance on Receiver Inputs

(R

IN

=

150kΩ

typical)

■ Half-Duplex Configuration Consistent

With Industry Standard Pinout

■ –7V to +12V Common Mode Input

Voltage Range

■

Includes Shutdown Mode

(For SP481R Only)

(ICC < 10µA)

■ Low Power Consumption (250mW)

■ Separate Driver and Receiver Enable

Now Available in Lead Free Packaging

DESCRIPTION

The SP481R and SP485R are pin-to-pin equivalent with our existing SP485 product and contain

enhancements such as higher ESD tolerance and high receiver input impedance. The higher

receiver input impedance allows for connecting over 400 transceivers on a single transmission

line without degrading the RS-485 driver signal. Each device is packaged in an 8-pin plastic DIP

or 8-pin narrow SOIC package. The SP481R offers a shutdown feature via the enable pins which

will

reduce

the

supply

current

(I )

CC

below

0.5µA

typical.

TYPICAL APPLICATION CIRCUIT

Date: 6/21/04

RO 1

RE 2

DE 3

DI 4

R

8 VCC

7B

6A

D

SP485 5 GND

Top View

SP485R RS-485 Serial Transceiver

1

© Copyright 2004 Sipex Corporation

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