LT1537 Datasheet | Linear Technology

LT1537 Advanced Low Power 5V RS232 Transceiver with Small Capacitors Features s s s s s s s s s s DESCRIPTIO s s s s Low Cost Uses Small Capacitors: 0.1µF, 0.2µF 1µA Supply Current in Shutdown 120k Baud Operation for RL = 3k, CL = 2500p F 250k Baud Operation for RL = 3k, CL = 1000p F CMOS parable Low Power: 40m W 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 The LT ®1537 is a three-driver, five-receiver RS232 transceiver, pin patible with the LT1137A, offering performance improvements and two shutdown modes. The LT1537’s charge pump is designed for extended pliance and can deliver over 35m A of load current. Supply current is typically 8m A, petitive with similar CMOS devices. An advanced driver output stage operates up to 250kbaud while driving heavy capacitive loads. The LT1537 is fully pliant 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 ± 5k V 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. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATI s s Notebook puters Palmtop puters TYPICAL APPLICATI 0.1µF + + V+ 5V VCC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 LT1537 28 27 25 24 23 22 21 20 19 18 17 16 15 26 V- 2 × 0.1µF 0.1µF RECEIVER OUTPUT CL = 50p F R DRIVER OUTPUT RL = 3k...