LTC1349 Datasheet | Linear Technology

LTC1349 5V Low Power RS232 3-Driver/5-Receiver Transceiver with 2 Receivers Active in SHUTDOWN Features s s s s s s s s DESCRIPTIO s s s Low Supply Current: 300µA Two Receivers Kept Alive in SHUTDOWN ESD Protection Over ±10k V Operates from a Single 5V Supply Uses Small Capacitors: 0.1µF Operates to 120k Baud 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 Pin patible with LT1137A and LT1237 Flowthrough Architecture The LTC1349 is a 3-driver/5-receiver RS232 transceiver with very low supply current. In the no load condition, the supply current is only 300µA. The charge pump only requires four 0.1µF capacitors. In SHUTDOWN mode, two receivers are kept alive and the supply current is 35µA. All RS232 outputs assume a high impedance state in SHUTDOWN and with the power off. The LTC1349 is fully pliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120k baud with a 2500p F, 3kΩ load. Both driver outputs and receiver inputs can be forced to ± 25V without damage, and can survive multiple ± 10k V ESD strikes. APPLICATI s s Notebook puters Palmtop puters TYPICAL APPLICATI V+ C1 0.1µF C2 0.1µF DRIVER 1 OUT RX1 IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN ON/OFF NC VCC 3-Drivers/5-Receivers with SHUTDOWN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LTC1349 28 27 26 25 24 23 22 21 20 19 18 17 16 15 C3 0.1µF DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT GND NC NC - TA01 Quiescent and SHUTDOWN Supply Current vs Temperature C4 0.1µF 1200 1000 QUIESCENT CURRENT (µA) 800 600 400 200 0 - 40 QUIESCENT CURRENT SHUTDOWN CURRENT 60 50 SHUTDOWN CURRENT (µA) 40 30 20 10 V- 0 0 80 100 20 60 40 TEMPERATURE (°C) TEST CONDITION: VCC = 5V, ALL DRIVER INPUTS TIED TO VCC. - 20 - TA02 LTC1349 ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW V+ 1 VCC...