特点
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
典型应用
典型应用
描述
描述 The LT?1537 is a three-driver, five-receiver RS232 transceiver, pin compatible with the LT1137A, offering performance improvements and two shutdown modes. The LT1537μs 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. The LT1537 is fully compliant with all RS232 specifications. Special bipolar construction techniques protect the drivers and receivers beyond the fault conditions stipulated for RS232. Driver outputs and receiver inputs can be shorted to ?25V without damaging the device or the power supply generator. In addition, the RS232 I/O pins are resilient to multiple ?5kV ESD strikes. The transceiver has two shutdown modes. One mode disables the drivers and the charge pump, the other shuts down all circuitry. While shut down, the drivers and receivers assume high impedance output states.