MAX3221EEAE-T

Overview

The MAX3221EEAE-T is a single-driver, single-receiver RS-232 transceiver in a 16-pin SSOP package. It operates from a +3.0V to +5.5V supply and supports data rates up to 250kbps. The device features an AutoShutdown function that reduces supply current to 1µA when no valid signal is detected. It includes ±15kV ESD protection on all pins and requires four 0.1µF capacitors for its dual charge pump.

Feature Summary

• AutoShutdown technology automatically disables the charge pump and drivers to minimize power consumption during idle periods.
• Integrated dual charge pumps generate internal ±5.5V supplies from a single low-voltage source using external capacitors.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events without latchup.

Applications

• Notebook, subnotebook, and palmtop computers
• Battery-powered equipment and handheld devices
• Cellular phones and peripherals

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging if required by assembly equipment. Confirm the 'E' designation matches the -40°C to +85°C industrial temperature range. Ensure the component is lead-free and RoHS compliant as indicated by the '+' symbol in the base part number.

Selection Notes

Select this model for applications requiring minimal pin count and lowest possible quiescent current. The single driver/receiver configuration is optimal for simple point-to-point serial links. Verify that the system can tolerate the wake-up time associated with the AutoShutdown feature before deployment.

Part Context

This component belongs to the MAX3221E/MAX3223E/MAX3243E family of 3V-powered RS-232 transceivers. While the MAX3223E offers two channels and the MAX3243E provides three drivers and five receivers, the MAX3221E serves as the most compact solution within this series for space-constrained designs.

Replacement Considerations

Public confirmed substitutes include MAX3221ECAE+ (commercial grade) and MAX3221ECUE+ (TSSOP package). Cross-reference electrical characteristics and pinouts carefully when substituting between different package types or temperature grades.

FAQ

How does the AutoShutdown feature determine when to enter low-power mode?

The device enters shutdown mode when it senses no valid RS-232 signal levels on all receiver inputs for at least 30µs, reducing supply current to 1µA.

What are the ESD protection ratings for the MAX3221E?

All transmitter outputs and receiver inputs are protected to ±15kV via IEC 1000-4-2 Air-Gap Discharge, ±8kV via Contact Discharge, and ±15kV via the Human Body Model.

Can the MAX3221E drive a serial mouse directly?

No, the MAX3221E lacks the additional receiver outputs required for mouse driveability; the MAX3243E is specifically designed for this application.