MAX222CN

Overview

The MAX222CN is a dual RS-232 transceiver manufactured by Texas Instruments, designed for low-power applications. It features two drivers and two receivers, supporting data rates up to 120 kbps. The device operates from a single +5 V supply using charge pump circuitry to generate the required positive and negative voltages for RS-232 communication. It includes shutdown mode for power conservation and accepts standard TTL/CMOS logic levels at its inputs while providing EIA/TIA-232 compliant outputs.

Feature Summary

• Integrated charge pump eliminates need for external voltage sources
• Shutdown mode reduces power consumption significantly
• Compatible with standard TTL and CMOS logic interfaces

Applications

• Portable battery-powered equipment requiring RS-232 connectivity
• Modems and fax machines
• Industrial control systems with low-power requirements

Procurement Notes

Verify the package type matches the application requirements, as the CN suffix indicates a plastic DIP package. Confirm that the operating temperature range meets the environmental conditions of the end-use system. Ensure compatibility with existing board layout regarding the charge pump capacitors specified in the datasheet.

Selection Notes

Select this component when a dual-channel RS-232 solution is needed with minimal external components. Consider the single-supply operation advantage over older multi-supply transceivers. Evaluate the 120 kbps speed limit against the system's baud rate requirements to ensure adequate performance margins.

Part Context

This part belongs to the MAX22x family of RS-232 transceivers. It shares functional similarities with other devices in the series but differs in pinout and specific electrical characteristics. It serves as a drop-in replacement for certain legacy dual-driver designs while offering improved power efficiency.

Replacement Considerations

Check for direct pin-compatible alternatives within the same manufacturer's portfolio. Verify that substitute parts maintain the same charge pump architecture and shutdown functionality. Ensure voltage levels and data rate capabilities are equivalent or superior.