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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.
