LTC1535

1

1535fb

TYPICAL APPLICATION

FEATURES

DESCRIPTION

Isolated RS485 Transceiver

line transceiver. Isolated RS485 is ideal for systems where

the ground loop is broken to allow for much larger common

mode voltage ranges. An internal capacitive isolation barrier

and the logic level interface. The powered side contains a

420kHz push-pull converter to power the isolated RS485

transceiver. Internal full-duplex communication occurs

through the capacitive isolation barrier. The transceiver

meets RS485 and RS422 requirements.

The driver and receiver feature three-state outputs, with

the driver maintaining high impedance over the entire

common mode range. The drivers have short-circuit

current limits in both directions and a slow slew rate select

to minimize EMI or reflections. The 68kΩ receiver input

allows up to 128 node connections. A fail-safe feature

defaults to a high output state when the receiver inputs

are open or shorted.

APPLICATIONS

UL Recognized

®

File #E151738

Shorted Receiver Inputs

Receiver Inputs

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

**

D

Y

Z

SLO

2

1

1

R

A

B

RO2

1535 TA01

RO

RE

DE

DI

GND

LOGIC COMMON

2

FLOATING RS485 COMMON

** COOPER (888) 414-2645

420kHz

28

27

26

25

4

17

15

16

18

12

13

14

11

1

+

+

GND2

1/2 BAT54C

1/2 BAT54C

ST1

ST2

3

2

RO

RE

DE

DI

1

10μF

10μF

2

CTX02-14659

TWISTED-PAIR

CABLE