LT1081 Datasheet | Linear Technology

LT1080/LT1081 Advanced Low Power 5V RS232 Dual Driver/Receiver Features s DESCRIPTIO s s s s s s Superior to CMOS - Improved Speed: Operates over 120k Baud - Improved Protection: Outputs Can Be Forced to ± 30V without Damage - Three-State Outputs Are High Impedance When Off - Only Needs 1µF Capacitors Absolutely No Latchup CMOS parable Low Power: 60m W Can Power Additional RS232 Drivers: 10m A Supply Current in Shutdown: 1µA Available in SO Package Available with or without Shutdown The LT®1080/LT1081 are the only dual RS232 driver/ receiver with charge pump to guarantee absolutely no latchup. These interface optimized devices provide a realistic balance between CMOS levels of power dissipation and real world requirements for ruggedness. The driver outputs are fully protected against overload and can be shorted to ±30V. Unlike CMOS, the advanced architecture of the LT1080/LT1081 does not load the signal line when “shut down” or when power is off. Both the receiver and RS232 outputs are put into a high impedance state. An advanced output stage allows driving higher capacitive loads at higher speeds with exceptional ruggedness against ESD. For applications requiring up to five drivers and five receivers with charge pump in one package see the LT1130A Series data sheet. A version of the LT1080/LT1081, the LT1180A and LT1181A that use only 0.1µF capacitors, is also available. All of Linear Technology’s RS232 ICs are available in standard surface mount packages. , LTC and LT are registered trademarks of Linear Technology Corporation. U APPLICATIO S s s s s s Portable puters Battery-Powered RS232 Systems Power Supply Generator Terminals Modems TYPICAL APPLICATIO 2 1µF 4 LT1080 5 1µF 6 12 LOGIC INPUTS 15 7 17 3 5V INPUT 9V OUTPUT 1µF - 9V OUTPUT Supply Generator Outputs 10 8 RL TO V - V + OUTPUT RL TO GND OUTPUT VOLTAGE (V) 1µF RS232 OUTPUT 6 4 2 0 - 2 - 4 - 6 VCC = 5V 11 13 8 14 5k RS232 OUTPUT RS232 INPUT LOGIC OUTPUTS 10...