1

LTC1544

Software-Selectable

Multiprotocol Transceiver

D2

D1

LTC1544

RTS

DTR

DSR

DCD

CTS

D3

R2

R1

R4

R3

D2

LTC1543

LL

TXD

SCTE

TXC

RXC

RXD

2

14

24

11

15

12

17

9

3

1

4

19

20

623

22

5

13

8

10

18

7

16

1544 TA01

LTC1344A

D3

R2

R1

R3

D1

DB-25 CONNECTOR

D4

DTE or DCE Multiprotocol Serial Interface with DB-25 Connector

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

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Data Networking

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CSU and DSU

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Data Routers

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Software-Selectable Transceiver Supports:

RS232, RS449, EIA530, EIA530-A, V.35, V.36, X.21

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TUV/Detecon Inc. Certified NET1 and NET2

Compliant (Test Report No. NET2/102201/97)

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TBR2 Compliant (Test Report No. CTR2/022701/98)

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Software-Selectable Cable Termination Using

the LTC1344A

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Complete DTE or DCE Port with LTC1543, LTC1344A

or LTC1546 with Integrated Termination

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Operates from Single 5V Supply with LTC1543

The LTC

ceiver. The LTC1544 and LTC1543 form the core of a

complete software-selectable DTE or DCE interface port that

supports the RS232, RS449, EIA530, EIA530-A, V.35, V.36

or X.21 protocols. Cable termination for the LTC1543 may be

implemented using the LTC1344A software-selectable cable

termination chip or by using existing discrete designs. The

LTC1546 includes software-selectable cable termination on-

chip.

The LTC1544 runs from a 5V supply and the charge pump on

the LTC1543 or LTC1546. The part is available in a 28-lead

SSOP surface mount package.

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO