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LTC1344ACG
LTC1344A Software-Selectable Cable Terminator U DESCRIPTION FEATURES s s The LTC ®1344A 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 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. 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 LTC1344A is similar to the LTC1344 except for a difference in the Mode Selection table. U APPLICATIONS s s Data Networking CSU and DSU Data Routers , LTC and LT are registered trademarks of Linear Technology Corporation. U s The LTC1344A is available in a 24-lead SSOP. TYPICAL APPLICATION DTE or DCE Multiprotocol Serial Interface with DB-25 Connector LL CTS DSR DCD DTR RTS RXD TXC RXC Daisy-Chained Control Outputs D3 R4 R3 R2 D2 TXD D2 D1 LTC1543 LTC1544 D4 SCTE D3 D1 R3 R1 R1 R2 LTC1344A 18 13 5 10 8 22 6 23 20 19 4 1 7 16 3 17 12 15 11 24 14 2 TXD A (103) TXD B SCTE A (113) TXC A (114) SCTE B TXC B RXC A (115) RXC B RXD A (104) RXD B SG (102) SHIELD (101) RTS A (105) RTS B DTR A (108) DCD A (107) DTR B DCD B DSR A (109) CTS A (106) DSR B CTS B LL A (141) DB-25 CONNECTOR 9 1344A TA01 1
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