LTC1344 데이터 시트보기 (PDF) - Linear Technology

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LTC1344

Software-Selectable Cable Terminator

Linear Technology 

LTC1344

Software-Selectable

Cable Terminator

FEATURES

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

s Outputs Won’t Load the Line with Power Off

U

APPLICATIO S

s Data Networking

s CSU and DSU

s Data Routers

DESCRIPTIO

The LTC®1344 features six software-selectable

multiprotocol cable terminators. Each terminator can be

configured as an RS422 (V.11) 100Ω 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.

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

TYPICAL APPLICATION

CTS DSR DCD

DTR RTS RL

Daisy-Chained Control Outputs

LTC1343

R4 R3 R2 R1

D4 D3 D2 D1

TM RXD RXC TXC

SCTE TXD LL

LTC1343

R4 R3 R2 R1

D4 D3 D2 D1

LTC1344

13 5 22 6 10 8

23 20 19 4 21 1 7 25 16 3 9 17 12 15

11 24 14 2 18

DB-25 CONNECTOR

1344 TA01

1

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