Rhopoint Components Ltd

Tel: +44 (0) 870 608 1188

Fax: +44 (0) 870 241 2255

Germany: +49 (0) 692 199 8606

Fax: +49 (0) 692 199 8595

Email: sales@rhopointcomponents.com

Website: www.rhopointcomponents.com

The

IL485W

is

a

galvanically isolated, high-

speed

differential

bus

transceiver, designed for

bi-directional

data

communication

on

balanced

transmission

lines. The IL485W uses

patented

IsoLoop®

technology and is the first

isolated RS-485 interface

available in a standard 16

pin SOIC package, which

meets the ANSI Standards

EIA/TIA-422-B

and

RS485.

The IL485W has current limiting and thermal shutdown features to

protect against output short circuits and bus contention situations where

these may cause excessive power dissipation.

With a 1 nsec pulse skew and 16 nsec propagation delay, the IL485W is

ideal for PROFIBUS applications. Use of DE/ISODE and IN1/OUT1

allows the IL485W to perform the handshaking operations of RTSAS

and DTSAS of PROFIBUS.

Lines in Noisy Environments

Applications

Isolated RS485 Interface with

Handshake

IL485W

VID

(A-B)

DE

RE

ISODE R

D

MODE

≥0.2V

L

L

L

H

X

Receive

≤-0.2V

L

L

L

L

X

Receive

-7<VID<12

X

H

X

Z

X

Receive/

Drive

≥ 1.5

H

L

H

H

H

Drive

≤-1.5

H

L

H

L

L

Drive

Open

L

L

L

H

X

Receive

H = High Level

L = Low Level

X = Irrelevant

Z = High Impedance

Function Table

Functional Diagram (IL485W)

Dimensions in mm

PROFIBUS Fault Interrogation