MAX222EPN

Overview

The MAX222EPN is a dual-channel RS-232 transceiver from the MAX220–MAX249 family, designed for EIA/TIA-232E and V.28/V.24 interfaces. It operates on a single +5V supply (4.5V to 5.5V) using integrated charge pumps to generate ±10V internally. The device features two drivers and two receivers with full-duplex communication capability. It supports data rates up to 200kbps and includes a shutdown mode consuming as low as 10µA. The component is housed in an 18-pin Plastic DIP package and operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated charge pump circuitry eliminates the need for external bipolar ±12V supplies
• Enables single-supply operation directly from a +5V source
• Includes a dedicated shutdown pin for significant power reduction

Applications

• Interface translation between TTL/CMOS logic and RS-232 standards
• Multidrop RS-232 network connections
• Portable diagnostics equipment requiring low power consumption

Procurement Notes

Verify the specific suffix 'EPN' against the manufacturer's current ordering information table to confirm the exact package type and temperature grade. Ensure that the required external capacitors match the datasheet specifications for the MAX222 variant, as this model requires discrete components unlike the integrated capacitor versions in the same family.

Selection Notes

Select the MAX222EPN when board space allows for external capacitors but bipolar supplies are unavailable. Compare it against MAX233 or MAX235 if internal capacitors are preferred to save PCB area. Verify that the 200kbps data rate meets system requirements, as higher-speed variants exist within the broader MAX220-MAX249 lineup.

Part Context

This component belongs to the MAX220–MAX249 family of +5V-powered multichannel RS-232 drivers and receivers. Unlike the MAX225 or MAX233 which integrate capacitors, the MAX222 requires external capacitors for its charge pump. It shares the same functional architecture as the MAX232 but offers specific electrical characteristics suited for standard industrial communication environments.

Replacement Considerations

The MAX232EPN is a direct functional equivalent within the same family, sharing identical pinouts and electrical specifications. Other compatible alternatives include the MAX233EPE and MAX242EPE, provided their respective capacitor integration and control pin configurations align with the design constraints.