1

Date: 6/23/04

SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers

© Copyright 2004 Sipex Corporation

SP3483

■ RS-485 and RS-422 Transceiver

■ Operates from a single +3.3V supply

■ Interoperable with +5.0V logic

■ Driver/Receiver Enable

■ Low Power Shutdown Mode

■ -7V to +12V Common-Mode Input

Voltage Range

■ Allows up to 32 transceivers on

the serial bus

■ Compatibility with the industry

standard 75176 pinout

■ Driver Output Short-Circuit Protection

■ Slew Rate Limited Driver for Low EMI

(SP3483)

The SP3483 device is part of a family of +3.3V low power half-duplex transceivers that meet

the specifications of the RS-485 and RS-422 serial protocols. This device is pin-to-pin

compatible with the Sipex SP483 device as well as popular industry standards. The SP3483

features Sipex's BiCMOS process, allowing low power operation without sacrificing

performance. The SP3483 is internally slew rate limited to reduce EMI and can meet the

requirements of RS-485 and RS-422 up to 250kbps.

+3.3V Low Power Slew Rate Limited

Half-Duplex RS-485 Transceiver

®

DESCRIPTION

INPUTS

OUTPUTS

LINE

RE

DE

DI CONDITION

B

A

X1

1

No Fault

0

1

X1

0

No Fault

1

0

X0

X

X

ZZ

INPUTS

OUTPUTS

RE

DE

A - B

R

00

+0.2V

1

00

-0.2V

0

00

Inputs Open

1

10

X

Z

Table 1. Transmit Function Truth Table

Table 2. Receive Function Truth Table

TRUTH TABLES

1

2

3

4

5

6

7

8

8 Pin nSOIC

RE

SP3483

RO

DE

DI

B

A

GND

VCC

Now Available in Lead Free Packaging