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1. Description
The MAX232DR device is a dual driver/receiver that includes a capacitive voltage generator to supply TIA/EIA-232-F voltage levels from a single 5-V supply. Each receiver converts TIA/EIA-232-F inputs to 5-V TTL/CMOS levels. These receivers have a typical threshold of 1.3 V, a typical hysteresis of 0.5V, and can accept ±30-V inputs. Each driver converts TTL/CMOS input levels into TIA/EIA-232-F levels.
2. Features
1. Meets or Exceeds TIA/EIA-232-F and ITU Recommendation V.28
2. Operates From a Single 5-V Power Supply With 1.0-µF Charge-Pump Capacitors
3. Operates up to 120 kbit/s
4. Two Drivers and Two Receivers
5. ±30-V Input Levels
6. Low Supply Current: 8 mA Typical
7. ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
8. Upgrade With Improved ESD (15-kV HBM) and 0.1-µF Charge-Pump Capacitors is Available With the MAX202 Device
3. Applications
1. TIA/EIA-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 5V supply for the RS232 driver using a charge pump that requires four 1-µF external capacitors.
2. RS232 Driver
Two drivers interface standard logic level to RS232 levels. Internal pull up resistors on TIN inputs ensures a high input when the line is high impedance.
3. RS232 Receiver
Two receivers interface RS232 levels to standard logic levels. An open input will result in a high output on ROUT
7. Application information
For normal operation, add capacitors. Pins 9 to 12 are connected to UART or general purpose Destination logic line. The EIA-232 line will be connected to the connector or cable.
