LTC1348 Datasheet | Linear Technology

LTC1348 3.3V/5V Low Power RS232 3-Driver/5-Receiver Transceiver Features s s s s s s s s DESCRIPTIO s s Low Supply Current: 600µA at 3.3V Supply Current in Shutdown: 0.2µA Supply Current in Receiver Alive Mode: 15µA ESD Protection over ± 10k V Operates from a Single 3V to 5.5V Supply Operates to 120k Baud with 0.1µF Flying Capacitors Three-State Outputs Are High Impedance When Off Output Overvoltage Does Not Force Current Back into Supplies RS232 I/O Lines Can Be Forced to ± 25V Without Damage Flowthrough Architecture The LTC®1348 is a 3-driver/5-receiver RS232 transceiver with very low supply current. The charge pump only requires five 0.1µF capacitors. The LTC1348 provides full RS232 output levels when operated over a wide supply range of 3V to 5.5V The transceiver operates in one of four modes: Normal, Receiver Disable, Receiver Alive and Shutdown. In Normal or Receiver Disable mode, ICC is only 600µA at 3.3V and 800µA at 5V in the no load condition. In Shutdown mode, the supply current is further reduced to 0.2µA. In Receiver Alive mode, all five receivers are kept alive and the supply current is 15µA. All RS232 outputs assume a high impedance state in Shutdown or Receiver Alive mode or with the power off. The receiver outputs assume a high impedance state in Receiver Disable or with the power off. The LTC1348 is fully pliant with all data rate and overvoltage RS232 specifications. The transceiver operates up to 120kbaud with all drivers loaded with 1000p F, 3kΩ. Both driver outputs and receiver inputs can be forced to ± 25V without damage and can survive multiple ±10k V ESD strikes. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATI s s s s Notebook puters Palmtop puters Printers Portable Instruments TYPICAL APPLICATI V+ C5 0.1µF C2 0.1µF VCC C1 0.1µF DR 1 OUT RX1 IN DR 2 OUT RX2 IN RX3 IN RX4 IN DR 3 OUT RX5 IN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1348 3-Drivers/5-Receivers with Shutdown 28 27 26 25 24 23 22...