DESCRIPTION
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.

FEATURES
■ Superior to CMOS
   – Improved Speed: Operates over 120kBaud
   – 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 Comparable Low Power: 60mW
■ Can Power Additional RS232 Drivers: 10mA
■ Supply Current in Shutdown: 1µA
■ Available in SO Package
■ Available with or without Shutdown

APPLICATIONS
■ Portable Computers
■ Battery-Powered RS232 Systems
■ Power Supply Generator
■ Terminals
■ Modems