MAX222EWN-T

Overview

The MAX222EWN-T is a fully compliant RS-232 transceiver designed for single-supply operation. It integrates two drivers and two receivers within an 18-pin SOIC package. The device utilizes internal charge pumps to generate the necessary bipolar voltage levels from a single +5V supply, eliminating the need for external dual-voltage sources. It supports data rates up to 250 kbps and operates reliably across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates on-chip charge pumps to create required RS-232 voltage swings without external transformers or dual supplies
• Provides full EIA/TIA-232-E compliance with guaranteed driver output voltages and receiver input thresholds
• Features TTL/CMOS-compatible inputs and outputs for direct interfacing with microcontrollers and serial ports

Applications

• Industrial equipment requiring robust serial communication links
• Portable battery-powered instruments utilizing single-supply architectures
• Modems and peripheral interfaces in computing systems

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging configuration when sourcing. Confirm that the 'EW' designation corresponds to the narrow SOIC package dimensions required by the target PCB layout. Ensure the component meets RoHS standards if environmental compliance is mandatory for the assembly process.

Selection Notes

Select this component when space constraints prevent the use of larger DIP packages but dual-supply generation is undesirable. It serves as a drop-in replacement for older MAX222 variants in designs requiring standard RS-232 signaling over short distances at moderate speeds.

Part Context

This part belongs to the Maxim Integrated MAX220–MAX249 family of multichannel RS-232 drivers and receivers. These devices are engineered to simplify interface design by removing the complexity of generating negative voltages externally, making them suitable for modern low-voltage digital systems.

Replacement Considerations

The ADM222 offers pin compatibility with similar functionality but may require different capacitor values due to distinct internal charge pump architectures.