LTC1338 Datasheet | Linear Technology

LTC1338 5V Low Power RS232 5-Driver/3-Receiver Transceiver Features s s s s s s s s s DESCRIPTIO s s Low Supply Current: 500µA 0.2µA Supply Current in SHUTDOWN 50µA Supply Current in RECEIVER ALIVE Mode 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 Flowthrough Architecture The LTC1338 is a 5-driver/ 3-receiver RS232 transceiver with very low supply current. In the no load condition, the supply current is only 500µA. The charge pump only requires four 0.1µF capacitors. In SHUTDOWN mode, the supply current is further reduced to 0.2µA. In RECEIVER ALIVE mode, all three receivers are kept alive and the supply current is 50µA. All RS232 outputs assume a high impedance state in SHUTDOWN and with the power off. The LTC1338 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 s s Battery-Powered Modems Battery-Powered DCE Notebook puters Palmtop puters TYPICAL APPLICATI V+ C1 0.1µF C2 0.1µF DRIVER 1 OUT DRIVER 2 OUT RX1 IN DRIVER 3 OUT RX2 IN DRIVER 4 OUT RX3 IN DRIVER 5 OUT RX ENABLE NC VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 5-Drivers/3-Receivers with SHUTDOWN 28 LTC1338 27 26 25 24 23 22 21 20 19 18 17 16 15 C3 0.1µF DRIVER 1 IN DRIVER 2 IN RX1 OUT DRIVER 3 IN RX2 OUT DRIVER 4 IN RX3 OUT DRIVER 5 IN GND DRIVER ENABLE NC - TA01 V- C4 0.1µF 1200 1000 QUIESCENT CURRENT (µA) 800 600 400 200 0 - 40 SHUTDOWN CURRENT QUIESCENT CURRENT - 20 TEST CONDITION: VCC = 5V, ALL DRIVER INPUTS TIED TO VCC. Supply Current 1.2 1.0 SHUTDOWN CURRENT (µA) 0.8 0.6 0.4 0.2 0 100 0 20 40 60 TEMPERATURE...