LTC1344A 查看數據表（PDF） - Linear Technology

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LTC1344A

Software-Selectable Cable Terminator

Linear Technology 

LTC1344A

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

APPLICATIONS

s Data Networking

s CSU and DSU

s Data Routers

DESCRIPTION

The LTC®1344A 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

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.

, 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

D4

R4

Daisy-Chained Control Outputs

LTC1544

R3 R2 R1

D3 D2 D1

LTC1543

R3 R2 R1

D3 D2 D1

LTC1344A

18 13 5 10 8

22 6 23 20 19 4 1 7 16 3 9 17

12 15 11 24 14 2

DB-25 CONNECTOR

1344A TA01

1

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