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LTC1349 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1349 Datasheet(HTML) 1 Page - Linear Technology |
1 / 8 page 1 LTC1349 1349fa 5V Low Power RS232 3-Driver/5-Receiver Transceiver with 2 Receivers Active in Shutdown Quiescent and Shutdown Supply Current vs Temperature ■ Low Supply Current: 300µA ■ Two Receivers Kept Alive in Shutdown ■ ESD Protection Over ±10kV ■ 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 Compatible with LT1137A and LT1237 ■ Flowthrough Architecture The LTC ®1349 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 compliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120k baud with a 2500pF, 3kΩ load. Both driver outputs and receiver inputs can be forced to ±25V without damage, and can survive multiple ±10kV ESD strikes. ■ Notebook Computers ■ Palmtop Computers TEMPERATURE (°C) 1200 1000 800 600 400 200 0 20 40 60 LTC1349 • TA02 80 0 –40 60 50 40 30 20 10 0 QUIESCENT CURRENT SHUTDOWN CURRENT TEST CONDITION: VCC = 5V, ALL DRIVER INPUTS TIED TO VCC. –20 100 3-Drivers/5-Receivers with Shutdown LTC1349 • TA01 VCC C1 0.1µF LTC1349 1 2 3 4 5 6 7 8 9 10 11 12 13 14 DRIVER 1 OUT RX1 IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN ON/OFF NC 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 V– V+ C2 0.1µF C4 0.1µF FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO , LTC and LT are registered trademarks of Linear Technology Corporation. |
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