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ST485BD

Low power RS-485 / RS-422 transceiver

STMicroelectronics 

ST485

Low power

RS-485/RS-422 transceiver

General features

■ Low quiescent current: 300µA

■ Designed for RS-485 interface application

■ -7V to 12V common mode input voltage range

■ Driver maintains high impedance in 3-state or

with the power OFF

■ 70mV tipycal input hysteresis

■ 30ns propagation delay, 5ns skew

■ Operate from a single 5V supply

■ Current limiting and thermal shutdown for

driver overload protection

■ Allows up to 64 transceivers on the bus

Description

The ST485 is al low power transceiver for RS-485

and RS-422 communication. Each part contains

one driver and one receiver.

This transceiver draw 300µA (typ.) of supply

current when unloaded or fully loaded with

disabled drivers.

DIP-8

SO-8

It operates from a single 5V supply.

Driver is short-circuit current limited and is

protected against excessive power dissipation by

thermal shutdown circuitry that placed the driver

outputs into a high-impedance state.

The ST485 is designed for bi-directional data

communications on multipoint bus transmission

line (half-duplex applciations).

The ST485 is available in three temperature

range: commercial (0°C to 70°C), industrial (-

40°C to 85°C) and automotive (-55°C to 125°C)

Order code

Part number Temperature range

ST485CN

ST485BN

ST485XN

ST485CD

ST485BD

ST485CDR

ST485BDR

ST485XDR

0 to 70 °C

-40 to 85 °C

-55 to 125 °C

0 to 70 °C

-40 to 85 °C

0 to 70 °C

-40 to 85 °C

-55 to 125 °C

August 2006

Package

DIP-8

DIP-8

DIP-8

SO-8 (Tube)

SO-8 (Tube)

SO-8 (Tape & reel)

SO-8 (Tape & reel)

SO-8 (Tape & reel)

Rev 13

Packaging

50parts per tube / 40tube per box

50parts per tube / 40tube per box

50parts per tube / 40tube per box

100parts per tube / 20tube per box

100parts per tube / 20tube per box

2500 parts per reel

2500 parts per reel

2500 parts per reel

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