MAX3221ECPWG4

Overview

The MAX3221ECPWG4 is a single-channel RS-232 transceiver manufactured by Texas Instruments. It operates from a single 3-V to 5.5-V supply and includes integrated charge pumps to generate the required voltages for RS-232 signaling without external transformers. The device supports data rates up to 250 kbps and features ±15-kV ESD protection on all pins. It incorporates an AutoShutdown feature that reduces supply current to 1 μA when the transmitter is disabled. The component is housed in a 16-pin TSSOP package.

Feature Summary

• Integrated charge pump eliminates need for external inductors or transformers
• AutoShutdown function minimizes power consumption during idle states
• Robust ±15-kV ESD protection ensures reliability in harsh environments
• Single-supply operation simplifies power design for portable applications

Applications

• Portable battery-powered devices requiring low-power serial communication
• Industrial control systems with RS-232 interface requirements
• Medical equipment needing robust ESD protection
• Handheld terminals and mobile computing devices

Procurement Notes

Verify the suffix G4 indicates lead-free RoHS compliance. Confirm the CPW package code corresponds to the 16-pin TSSOP variant. Ensure the E grade meets the specified industrial temperature range if operating outside commercial limits. Cross-reference the manufacturer's latest datasheet for any pinout revisions or updated electrical characteristics before finalizing procurement.

Selection Notes

Select this component when a single-channel RS-232 interface is needed with minimal external components. The 1 μA standby current makes it suitable for battery-operated systems. Verify that the 250 kbps speed meets application timing requirements. Consider the TSSOP package size constraints against available PCB space. Ensure voltage levels align with the 3-V to 5.5-V input range.

Part Context

This part belongs to the MAX322x family of RS-232 transceivers designed for low-voltage, low-power applications. It shares functional similarities with other single-channel devices but distinguishes itself through its specific AutoShutdown mechanism and ESD protection levels. The CPWG4 designation specifies the package type and environmental compliance within the broader product line.

Replacement Considerations

Direct replacements include the MAX3221ECPW and MAX3221IDRW. Verify pin compatibility and electrical specifications match exactly. Check if alternative packages like SOIC or QFN are acceptable for the design. Ensure substitute parts maintain the same ESD protection ratings and data rate capabilities.