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LTC1546

APPLICATIO S

FEATURES

DESCRIPTIO

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

Complete DTE or DCE Multiprotocol Serial Interface with DB-25 Connector

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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 Telecom Services Inc. Certified NET1,

NET2 and TBR2 Compliant

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On-Chip Cable Termination

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Pin Compatible with LTC1543

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Complete DTE or DCE Port with LTC1544

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Operates from Single 5V Supply

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Small Footprint

The LTC

ceiver with on-chip cable termination. When combined with

the LTC1544, this chip set forms a complete software-

selectable DTE or DCE interface port that supports the

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

protocols. All necessary cable termination is provided inside

the LTC1546. In most applications, the LTC1546 replaces

both an LTC1543 and an LTC1344A without any changes to

the PC board.

The LTC1546 runs from a single 5V supply using an internal

charge pump that requires only five space-saving surface

mounted capacitors. The LTC1546 is available in a 28-lead

SSOP surface mount package.

Software-Selectable

Multiprotocol Transceiver

with Termination

D2

D1

LTC1544

RTS

DTR

DSR

DCD

CTS

D3

R2

R1

R4

R3

LTC1546

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

1546 TA01

D1

DB-25 CONNECTOR

D4

D2

D3

R1

R2

R3

T

T

T

T

T