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LTC1344

Software-Selectable

Cable Terminator

FEATURES

s

DESCRIPTIO

s

Software-Selectable Cable Termination for:

RS232 (V.28)

RS423 (V.10)

RS422 (V.11)

RS485

RS449

EIA530

EIA530-A

V.35

V.36

X.21

Outputs Won鈥檛 Load the Line with Power Off

The LTC

廬

1344 features six software-selectable

multiprotocol cable terminators. Each terminator can be

configured as an RS422 (V.11) 100鈩?minimum differen-

tial load, V.35 T-network load or an open circuit for use

with RS232 (V.28) or RS423 (V.10) transceivers that

provide their own termination. When combined with the

LTC1343, the LTC1344 forms a complete software-select-

able multiprotocol serial port. A data bus latch feature

allows sharing of the select lines between multiple inter-

face ports.

The LTC1344 is available in a 24-lead SSOP.

, LTC and LT are registered trademarks of Linear Technology Corporation.

APPLICATIO S

s

s

s

Data Networking

CSU and DSU

Data Routers

TYPICAL APPLICATION

CTS

DSR

DCD

DTR

RTS

RL

TM

RXD

RXC

TXC

SCTE

TXD

LL

Daisy-Chained Control Outputs

LTC1343

D4

R4

R3

R2

R1

D3

D2

D1

R4

R3

R2

R1

LTC1343

D4

D3

D2

D1

13 5

22 6

10 8

23 20 19

4

21

1

7

25

16 3

9

17 12 15

11 24 14 2

DB-25 CONNECTOR

U

LTC1344

18

U

U

DSR B

DSR A (107)

RL A (140)

CTS B

CTS A (106)

DTR B

DTR A (108)

RTS B

RTS A (105)

SHIELD (101)

SGND (102)

TM A (142)

RXD B

RXD A (104)

RXC B

RXC A (115)

DCD B

DCD A (109)

SCTE B

SCTE A (113)

TXD B

TXD A (103)

LL A (141)

TXC B

TXC A (114)

1344 TA01

1

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