LTC1344A Datasheet | Linear Technology

LTC1344A Software-Selectable Cable Terminator Features s DESCRIPTION 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 bined with the LTC1543 and LTC1544, the LTC1344A forms a plete 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. s U APPLICATIONS s s 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 Outputs Won’t Load the Line with Power Off Data Networking CSU and DSU Data Routers , 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 Daisy-Chained Control Outputs LTC1544 D4 R4 R3 R2 R1 D3 D2 D1 R3 R2 R1 LTC1543 D3 D2 D1 18 LL A (141) 13 5 CTS B CTS A (106) 10 8 DSR B DSR A (109) 22 6 DCD B DCD A (107) 23 20 19 4 DTR B DTR A (108) RTS B RTS A (105) SHIELD (101) 1 SG (102) 16 3 RXD B RXD A (104) 9 RXC B 17 RXC A (115) 12 15 11 24 14 SCTE B SCTE A (113) TXD B TXD A (103) TXC B TXC A (114) DB-25 CONNECTOR 1344A...