The MAX3221IPWRG4 with RS-232 Interface IC is a single-channel line driver/receiver manufactured by Texas Instruments. It operates from a single 3.3V to 5.5V power supply, and is capable of achieving data rates up to 250 Kbps. It features a powerful ESD protection structure, providing a human body model rating of ±15kV. The MAX3221IPWRG4 contains a selectable charge pump or linear regulators for the generation of Vdd and +/- Vin. The core provides internal control signals for measuring the ± Vin supply levels. The receiver is enabled by an internal voltage level detector and can support +15kV ESD protection, making it suitable for a wide range of applications. The device features a 7-bit address-data encode option and address and data display that simplify system monitoring and debugging. Its on-chip slew rate limiting circuit reduces EMI, while its automatic logic shutdown further reduces power dissipation.