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SP3483

+3.3V Low Power Slew Rate Limited Half-Duplex RS-485 Transceiver

Signal Processing Technologies 

®

SP3483

+3.3V Low Power Slew Rate Limited

Half-Duplex RS-485 Transceiver

■ 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)

RO 1

RE 2

DE 3

DI 4

SP3483

8 Pin nSOIC

8 VCC

7B

6A

5 GND

Now Available in Lead Free Packaging

DESCRIPTION

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.

TRUTH TABLES

INPUTS

OUTPUTS

LINE

RE DE DI CONDITION B A

X 1 1 No Fault

01

X 1 0 No Fault

10

X0X

X

ZZ

Table 1. Transmit Function Truth Table

INPUTS

RE DE

0

0

0

0

0

0

1

0

OUTPUTS

A-B

R

+0.2V

1

-0.2V

0

Inputs Open

1

X

Z

Table 2. Receive Function Truth Table

Date: 6/23/04

SP3483 Low Power Slew Rate Limited Half-Duplex RS485 Transceivers

1

© Copyright 2004 Sipex Corporation

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