MAX222CWN+

Overview

The MAX222CWN+ is a +5V-powered, multichannel RS-232 line driver and receiver manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 4.5V to 5.5V and supports data rates up to 200kbps. The device features an integrated charge pump that generates ±10V internal voltages from a single +5V supply, eliminating the need for external bipolar power rails. It includes two drivers and two receivers with TTL/CMOS-compatible inputs and outputs. The component is housed in a 16-pin Wide SOIC package and is rated for commercial operating temperatures from 0°C to +70°C.

Feature Summary

• Integrated charge pump circuitry eliminates the requirement for external bipolar ±12V power supplies.
• Enables single-supply operation using only a +5V input source.
• Includes a low-power shutdown mode to minimize energy consumption when inactive.

Applications

• Interface translation between TTL/CMOS logic levels and RS-232 standards
• Multidrop RS-232 communication networks
• Portable diagnostic equipment requiring compact interface solutions

Procurement Notes

Verify the specific suffix 'CWN+' against official manufacturer documentation to confirm the wide SOIC package and commercial temperature range. Ensure compatibility with existing PCB footprints and soldering profiles before integration into production systems.

Selection Notes

Select this component for designs constrained by board space or those lacking negative voltage rails. Verify that the required data rate does not exceed 200kbps and that the load capacitance remains within the specified limits for reliable signal integrity.

Part Context

This part belongs to the MAX220–MAX249 family of +5V-powered RS-232 transceivers. The family offers various channel counts and packages, with the MAX222 specifically providing dual drivers and receivers in a standard surface-mount configuration.

Replacement Considerations

Direct replacements include other members of the MAX220–MAX249 family such as the MAX232A or MAX242, provided pinout compatibility and channel requirements match the design specifications.

FAQ

Does the MAX222CWN+ require external capacitors for its charge pump?

Yes, unlike some variants in the family, the MAX222 requires four external capacitors (typically 0.1µF) to support the internal charge pump operation.

What is the maximum data rate supported by this device?

The MAX222CWN+ supports data rates up to 200kbps under normal operating conditions.

How does the shutdown feature affect the output state?

When the shutdown pin is activated, the transmitter outputs enter a high-impedance state, and the receiver enters a low-power mode to reduce supply current.