MAX232ECPW

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1. Description

The MAX232ECPW is a dual driver and receiver that includes a capacitive voltage generator to supply RS232-F compliant voltage levels from a single 5-V supply. Each receiver converts RS-232 inputs to 5-V TTL/CMOS levels. This receiver has a typical threshold of 1.3 V, a typical hysteresis of 0.5 V, and can accept ±30-V inputs. Each driver converts TTL/CMOS input levels into TIA/RS-232-F levels.

2. Features

    1. Meets or Exceeds TIA/RS-232-F and ITU Recommendation V.28

    2. ESD Protection for RS-232 Bus Pins

        – ±15-kV Human-Body Model (HBM)

        – ±8-kV IEC61000-4-2, Contact Discharge

        – ±15-kV IEC61000-4-2, Air-Gap Discharge

    3. Operates From a Single 5-V Power Supply With 1-µF Charge-Pump Capacitors

    4. Operates up to 250 kbit/s

    5. Two Drivers and Two Receivers

    6. Low Supply Current: 8 mA Typical

3. Applications

    1. TIA/RS-232-F

    2. Battery-Powered Systems

    3. Terminals

    4. Modems

    5. Computers

4. Pin Configuration

5. Pin Functions

6. Feature Description

    1. Power

        The power block increases and inverts the 5-V supply for the RS-232 driver using a charge pump that requires four 1-µF external capacitors.

    2. RS-232 Driver

        Two drivers interface standard logic level to RS-232 levels. Internal pullup resistors on DIN inputs ensures a high input when the line is high impedance.

    3. RS-232 Receiver

        Two receivers interface RS-232 levels to standard logic levels. An open or shorted to ground input results in a high output on ROUT.