This is information on a product in full production.

September 2013

DocID025158 Rev 2

1/18

ST4485EB

3.3 V powered, 15 kV ESD protected, up to 20 Mbps RS-485/

RS-422 transceiver

Datasheet

Features

 ESD protection

– ± 15 kV human body model

– ± 8 kV IEC 1000-4-2 contact discharge

 Operate from a single 3.3 V supply - no charge

pump required

 Interoperable with 5 V logic

 1 µA low current shutdown mode max.

 Guaranteed 20 Mbps data rate

 -7 to 12 V common mode input voltage range

 Half duplex versions available

 Industry standard 75176 pinout

 Current limiting and thermal shutdown for

driver overload protection

 Guaranteed high receiver output state for

floating inputs with no signal present

 Allow up to 64 transceivers on the bus

 Wide operating temperature range:

-40 to +105 °C

Applications

 Industrial systems control

 Telecommunications

Description

The ST4485EB device is a ± 15 kV ESD

protected, 3.3 V low power transceiver for RS-485

and RS-422 communications. The device

contains one driver and one receiver in half

duplex configuration.

The ST4485EB transmits and receives at

a guaranteed data rate of at least 20 Mbps.

All transmitter outputs and receiver inputs are

protected to ± 15 kV using “Human Body Model”.

The driver is short-circuit current limited and is

protected against excessive power dissipation by

thermal shutdown circuitry that places the driver

outputs into a high-impedance state.

SO-8

Table 1. Device summary

Order code

Temperature range

Package

Packaging

ST4485EBDR

-40 to 105 °C

SO-8 (tape and reel)

2500 parts per reel

www.st.com