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LT1537 Datasheet(数据表) 1 Page - Linear Technology |
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LT1537 Datasheet(HTML) 1 Page - Linear Technology |
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1 page 
1 LT1537 Advanced Low Power 5V RS232 Transceiver with Small Capacitors DESCRIPTIO S FEATURE The LT ®1537 is a three-driver, five-receiver RS232 trans- ceiver, pin compatible with the LT1137A, offering perfor- mance improvements and two shutdown modes. The LT1537’s charge pump is designed for extended compli- ance 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 specifica- tions. Special bipolar construction techniques protect the drivers and receivers beyond the fault conditions stipu- lated 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. , LTC and LT are registered trademarks of Linear Technology Corporation. s Low Cost s Uses Small Capacitors: 0.1 µF, 0.2µF s 1 µA Supply Current in Shutdown s 120kBaud Operation for RL = 3k, CL = 2500pF s 250kBaud Operation for RL = 3k, CL = 1000pF s CMOS Comparable Low Power: 40mW s Operates from a Single 5V Supply s Easy PC Layout: Flow-through Architecture s Rugged Bipolar Design s Outputs Assume a High Impedance State When Off or Powered Down s Improved Protection: RS232 I/O Lines Can Be Forced to ±25V Without Damage s Output Overvoltage Does Not Force Current Back into Supplies s Absolutely No Latch-Up s Available in SO Package S APPLICATI s Notebook Computers s Palmtop Computers APPLICATI TYPICAL R LT1537 • TA02 LT1537 • TA01 5V VCC 0.1 µF 2 × 0.1µF 0.1 µF TO LINE LT1537 1 2 3 4 5 6 7 8 9 10 11 12 13 14 DRIVER OUT RX IN DRIVER OUT RX IN RX IN RX IN DRIVER OUT RX IN 28 27 26 25 24 23 22 21 20 19 18 17 16 15 2 × 0.1µF DRIVER IN RX OUT DRIVER IN RX OUT RX OUT RX OUT DRIVER IN RX OUT + TO LOGIC V– V+ ON/OFF = 5V + DRIVER DISABLE GND INPUT DRIVER OUTPUT RL = 3k CL = 2500pF RECEIVER OUTPUT CL = 50pF Output Waveforms |
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