MAX3221ECTE+T

Overview

The MAX3221ECTE+T is a single-driver, single-receiver RS-232 transceiver from the MAX3221E family. It operates on a +3.0V to +5.5V supply and supports data rates up to 250kbps. The device features AutoShutdown technology, reducing supply current to 1µA when no valid signal is detected. It includes ±15kV ESD protection per IEC 1000-4-2 standards. The component is housed in a 16-pin TQFN package with an exposed paddle and functions within a 0°C to +70°C temperature range.

Feature Summary

• AutoShutdown functionality reduces power consumption by disabling charge pumps and drivers during idle periods.
• Integrated dual charge pump generates internal ±5.5V supplies for true RS-232 performance from low-voltage sources.
• 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 'ECTE' corresponds to the 16-pin TQFN-EP package and the commercial 0°C to +70°C operating temperature range. Confirm that the '+' designation indicates lead-free and RoHS compliance status as defined by Analog Devices/Maxim Integrated specifications before finalizing procurement orders.

Selection Notes

Select this part for space-constrained designs requiring only one transmitter and receiver channel. Ensure the application environment remains within the specified 0°C to +70°C temperature limits. Verify that the system voltage falls between +3.0V and +5.5V to guarantee proper charge pump operation and signal integrity.

Part Context

This component belongs to the MAX3221E/MAX3223E/MAX3243E series of 3V-powered RS-232 transceivers. While the MAX3223E offers two channels and the MAX3243E provides three drivers and five receivers, the MAX3221E represents the smallest single-supply option in this lineup, optimized for minimal footprint applications.

Replacement Considerations

MAX3221EEAE+T (Same function, -40°C to +85°C temp range, SSOP package)

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 all receiver inputs for at least 30µs, reducing supply current to 1µA.

What is the purpose of the INVALID output pin?

The INVALID output goes low when no valid RS-232 signal levels are present on any receiver input, indicating the device may be in shutdown or disconnected state.

Can the MAX3221ECTE+T drive serial mice directly?

No, the MAX3221E is designed for single-channel use. The MAX3243E variant is specifically designed to drive serial mice due to its multiple drivers and regulated charge pump capabilities.