1

LTC1543

Software-Selectable

Multiprotocol Transceiver

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

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

1543 TA01

LTC1344A

D3

R2

R1

R3

D1

DB-25 CONNECTOR

D4

DTE or DCE Multiprotocol Serial Interface with DB-25 Connector

s

Data Networking

s

CSU and DSU

s

Data Routers

s

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 LTC1544, LTC1344A

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Operates from Single 5V Supply

The LTC

ceiver that operates from a single 5V supply. The LTC1543

and LTC1544 form the core of a complete software-select-

able DTE or DCE interface port that supports the RS232,

RS449, EIA530, EIA530-A, V.35, V.36 or X.21 protocols.

Cable termination may be implemented using the LTC1344A

software-selectable cable termination chip or by using exist-

ing discrete designs.

The LTC1543 runs from a single 5V supply using an internal

charge pump that requires only five space-saving surface

mounted capacitors. The part is available in a 28-lead SSOP

surface mount package.

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO