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LTC1344CG
LTC1344 Software-Selectable Cable Terminator U FEATURES s s DESCRIPTIO The LTC ® 1344 features six software-selectable multiprotocol cable terminators. Each terminator can be configured as an RS422 (V.11) 100Ω minimum differential 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-selectable multiprotocol serial port. A data bus latch feature allows sharing of the select lines between multiple interface ports. 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 Outputs Won’t Load the Line with Power Off The LTC1344 is available in a 24-lead SSOP. , LTC and LT are registered trademarks of Linear Technology Corporation. U APPLICATIO S s s Data Networking CSU and DSU Data Routers U s TYPICAL APPLICATION CTS DSR DCD DTR RTS RL TM RXD RXC TXC SCTE TXD LL D3 D2 D1 Daisy-Chained Control Outputs LTC1343 LTC1343 D4 R3 R4 R2 D3 D1 D2 D4 R1 R3 R4 R1 R2 LTC1344 13 5 22 6 10 8 23 20 19 4 21 1 7 25 16 3 17 12 15 11 24 14 2 18 LL A (141) TXD A (103) TXD B SCTE A (113) SCTE B TXC A (114) TXC B RXC A (115) RXC B RXD A (104) RXD B TM A (142) SGND (102) SHIELD (101) RL A (140) RTS A (105) RTS B DTR A (108) DTR B DCD A (109) DCD B DSR A (107) CTS A (106) DSR B CTS B DB-25 CONNECTOR 9 1344 TA01 1
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