MAX3221EETE+T

Overview

The MAX3221EETE+T is a single-driver, single-receiver RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. 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 I/O pins. The component is housed in a 16-pin TQFN package with an exposed paddle and is rated for an operating temperature range of -40°C to +85°C.

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 using only four small external capacitors.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events without latchup.

Applications

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

Procurement Notes

Verify the specific suffix EEATE corresponds to the required industrial temperature grade (-40°C to +85°C) and TQFN packaging. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the ordering code matches the exact pinout and electrical specifications defined in the datasheet.

Selection Notes

Select this component for applications requiring minimal footprint and low standby power. The single driver/receiver configuration suits simple serial port expansions. Verify that the system voltage falls within the 3.0V to 5.5V range and that the 250kbps speed meets communication requirements.

Part Context

This part belongs to the MAX3221E/MAX3223E/MAX3243E family of 3V-powered RS-232 transceivers. While the MAX3221E offers one driver and receiver, other family members provide additional channels. All variants share the same core AutoShutdown and ESD protection technologies.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.

FAQ

How does the AutoShutdown feature reduce power consumption?

It detects the absence of valid RS-232 signal levels on all receiver inputs for 30µs and subsequently shuts off the onboard charge pump and drivers, reducing supply current to 1µA.

What is the ESD protection rating for the MAX3221EETE+T?

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

What external components are required for operation?

The device requires four small 0.1µF capacitors (C1–C4) for the dual charge pump operation when powered from a +3.3V supply.