LTC1384 Datasheet | Linear Technology

LTC1384 5V Low Power RS232 Transceiver with 2 Receivers Active in Shutdown Features s s s DESCRIPTIO s s s s s s Operates from a Single 5V Supply Low Supply Current: ICC = 220µA ICC = 35µA in Shutdown Mode with Both Receivers Kept Alive ESD Protection Over ±10k V Uses Small Capacitors: 0.1µF Operates to 120k Baud Output Overvoltage Does Not Force Current Back into Supplies RS232 I/O Lines Can Be Forced to ± 25V Without Damage Pin patible with LT1180A The LTC1384 is an ultra-low power 2-driver/2-receiver RS232 transceiver that operates from a single 5V supply. The charge pump requires only four spacesaving 0.1µF capacitors. The transceiver operates in one of two modes, Normal and Shutdown. In the Normal mode, ICC is only 220µA with the driver outputs unloaded. In the Shutdown mode, the charge pump is turned off, the driver outputs are forced into three-state, both receivers are kept active and ICC drops to 35µA. The receiver outputs may be forced into three-state at any time using the receiver enable (EN) pin. The LTC1384 is fully pliant with all data rate and overvoltage RS232 specifications. The transceiver can operate up to 120kbaud 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 2 0.1µF 4 5 0.1µF 6 12 VCC 300k LOGIC INPUT LOGIC OUTPUT 11 13 LTC1384 VCC 300k 2-Drivers/2-Receivers with Shutdown and Receiver Enable 17 3 7 0.1µF 15 QUIESCENT CURRENT (µA) Quiescent and Shutdown Supply Current vs Temperature 1200 60 TEST CONDITION: VCC = 5V 0.1µF VCC = 5V 1000 800 600 400 200 0 - 20 QUIESCENT CURRENT SHUTDOWN CURRENT LOGIC INPUT 232 OUTPUT 8 14 5k 232 OUTPUT 232 INPUT LOGIC OUTPUT ON/OFF 10 18 5k 9 16 232 INPUT 1 RX EN - TA01 SHUTDOWN CURRENT (µA) 40 30 20 10...