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LTC1344A

Software-Selectable

Cable Terminator

FEATURES

s

DESCRIPTION

The LTC

廬

1344A 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

LTC1543 and LTC1544, the LTC1344A forms a complete

software-selectable multiprotocol serial port. A data bus

latch feature allows sharing of the select lines between

multiple interface ports.

The LTC1344A is similar to the LTC1344 except for a

difference in the Mode Selection table.

The LTC1344A is available in a 24-lead SSOP.

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

APPLICATIONS

s

s

s

Data Networking

CSU and DSU

Data Routers

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

TYPICAL APPLICATION

DTE or DCE Multiprotocol Serial Interface with DB-25 Connector

LL

CTS

DSR

DCD

DTR

RTS

RXD

RXC

TXC

SCTE

TXD

Daisy-Chained Control Outputs

LTC1544

D4

R4

R3

R2

R1

D3

D2

D1

R3

R2

R1

LTC1543

D3

D2

D1

18

LL A (141)

13 5

CTS B

CTS A (106)

10 8

DSR B

DSR A (109)

22 6

DCD B

DCD A (107)

23 20 19 4

DTR B

DTR A (108)

RTS B

RTS A (105)

SHIELD (101)

1

SG (102)

7

16 3

RXD B

RXD A (104)

9

RXC B

17

RXC A (115)

12 15 11 24 14

SCTE B

SCTE A (113)

TXD B

TXD A (103)

TXC B

TXC A (114)

DB-25 CONNECTOR

U

U

U

LTC1344A

2

1344A TA01

1

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