LT1785/LT1785A/

LT1791/LT1791A

16

178591fb

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

© LINEAR TECHNOLOGY CORPORATION 1998

LT 0608 REV B • PRINTED IN USA

RELATED PARTS

TYPICAL APPLICATION

PART NUMBER

DESCRIPTION

COMMENTS

LTC485

Low Power RS485 Interface Transceiver

LTC491

Differential Driver and Receiver Pair

LTC1483

Ultralow Power RS485 Low EMI Transceiver

Controlled Driver Slew Rate

LTC1485

Differential Bus Transceiver

10Mbaud Operation

LTC1487

Ultralow Power RS485 with Low EMI, Shutdown and High Input Impedance

Up to 256 Transceivers on the Bus

LTC1520

50Mbps Precision Quad Line Receiver

Channel-to-Channel Skew 400ps (Typ)

LTC1535

Isolated RS485 Full-Duplex Transceiver

LTC1685

52Mbps RS485 Half-Duplex Transceiver

Propagation Delay Skew 500ps (Typ)

LTC1687

52Mbps RS485 Full-Duplex Transceiver

Propagation Delay Skew 500ps (Typ)

Figure 10. Half-Duplex RS485 Network Operation

4

3

2

1

A

B 7

6

RO

RE

DE

DI

178591 F10

RX

TX

120Ω

120Ω

LT1785

4

3

2

1

A

B

7

6

RO

RE

DE

DI

RX

TX

LT1785

4

3

2

1

A

B

7

6

RO

RE

DE

DI

4

3

2

1

A

B

7

6

RO

RE

DE

DI

LT1785

LT1785

4

3

2

1

A

B 7

8

5

6

RO

RE

DE

DI

RX

TX

178591 F11

0.1μF

300V

47Ω

1.5KE36CA

47Ω

CARBON

COMPOSITE

5W

LT1785

RAYCHEM

POLYSWITCH

TR600-150

× 2

Figure 11. RS485 Network with 120V AC Line Fault Protection