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LTC1344

Software-Selectable

Cable Terminator

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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

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Outputs Won’t Load the Line with Power Off

The LTC

multiprotocol cable terminators. Each terminator can be

configured as an RS422 (V.11) 100

Ω 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.

Daisy-Chained Control Outputs

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Data Networking

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CSU and DSU

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Data Routers

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

D2

LTC1343

RTS

DTR

DSR

DCD

CTS

RL

D1

D3

D4

R1

R3

R4

R2

D2

LTC1343

LL

TXD

SCTE

TXC

RXC

RXD

TM

18

2

14

24

11

15

12

17

9

3

1

4

19

20

23

6

22

8

10

5

13

21

7

16

25

1344 TA01

DB-25 CONNECTOR

LTC1344

D1

D3

D4

R1

R3

R4

R2

FEATURES

DESCRIPTIO

APPLICATIO S