MAX3221ECUE+T

Overview

The MAX3221ECUE+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 IEC Air-Gap ESD protection on all pins. The component is housed in a 16-pin TSSOP package and functions within a temperature range of 0°C to +70°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 for true RS-232 signaling using only four small capacitors.
• Enhanced electrostatic discharge protection ensures robustness against high-voltage static events without latchup.

Applications

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

Procurement Notes

Verify the specific suffix ECUE corresponds to the required operating temperature range and package type. Confirm RoHS compliance status through official manufacturer documentation before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring minimal pin count and low-power standby modes. Ensure external capacitor values match the supply voltage requirements to maintain stable charge pump operation and signal integrity.

Part Context

This part belongs to the MAX3221E/MAX3223E/MAX3243E family of 3V-powered RS-232 transceivers. While other variants offer multiple drivers or receivers, this specific model provides a compact solution for single-channel serial communication interfaces.

Replacement Considerations

Direct functional substitutes include the MAX3221ECAE+T and MAX3221EEUE+. Verify pin compatibility and thermal performance when considering alternative packages or extended temperature ranges.

FAQ

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

The device enters shutdown mode if no valid RS-232 signal levels are detected on any receiver input for at least 30µs.

What is the maximum data rate supported by the MAX3221ECUE+T?

The device guarantees operation at data rates up to 250kbps while maintaining proper RS-232 output levels.

Does the INVALID output indicate active transmission?

No, the INVALID output goes low when no valid RS-232 signal levels are present on the receiver inputs, indicating an inactive state.