DESCRIPTION
The LT ®1537 is a three-driver, five-receiver RS232 transceiver, pin compatible with the LT1137A, offering performance improvements and two shutdown modes. The LT1537’s charge pump is designed for extended compliance and can deliver over 35mA of load current. Supply current is typically 8mA, competitive with similar CMOS devices. An advanced driver output stage operates up to 250kbaud while driving heavy capacitive loads.

FEATURES
■ Low Cost
■ Uses Small Capacitors: 0.1µF, 0.2µF
■ 1µA Supply Current in Shutdown
■ 120kBaud Operation for RL = 3k, CL = 2500pF
■ 250kBaud Operation for RL = 3k, CL = 1000pF
■ CMOS Comparable Low Power: 40mW
■ Operates from a Single 5V Supply
■ Easy PC Layout: Flow-through Architecture
■ Rugged Bipolar Design
■ Outputs Assume a High Impedance State When Off or Powered Down
■ Improved Protection: RS232 I/O Lines Can Be Forced to ±25V Without Damage
■ Output Overvoltage Does Not Force Current Back into Supplies
■ Absolutely No Latch-Up
■ Available in SO Package

APPLICATIONS
■ Notebook Computers
■ Palmtop Computers