MAX3221EAE-T

Overview

The MAX3221EAE-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 achieves 1µA supply current via the AutoShutdown feature when no valid signal is detected on receiver inputs for 30µs. The device supports data rates up to 235kbps with typical propagation delays of 0.3µs. Internal dual charge pumps generate ±5.5V rails using only 0.1µF capacitors at 3.3V operation. The industrial temperature range is -40°C to +85°C.

Feature Summary

• AutoShutdown technology reduces power consumption by disabling internal power supplies and drivers when idle.
• Integrated dual charge pump eliminates the need for external ±12V power sources.
• Provides true RS-322 performance directly from a single low-voltage supply.

Applications

• Battery-powered equipment
• Hand-held devices
• Portable diagnostics equipment

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type and temperature rating. Confirm RoHS compliance status through the datasheet or component marking. Ensure the source provides traceable manufacturing lot information. Cross-reference the part number with the authorized distributor list to validate authenticity.

Selection Notes

Select this component for applications requiring minimal quiescent current during cable disconnection. Verify that the system logic levels are compatible with the specified input thresholds. Ensure adequate decoupling capacitance is placed near the VCC pin to maintain stability during charge pump switching operations.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of 3V-powered RS-232 transceivers. The MAX3221 variant specifically integrates one transmitter and one receiver. It shares the same core architecture and AutoShutdown functionality as the multi-channel MAX3223 and MAX3243 models within the series.

Replacement Considerations

MAX3221CAE+T

FAQ

How does the AutoShutdown feature function?

When no valid RS-232 signal level is present on any receiver input for 30µs, the onboard power supply and drivers shut down, reducing supply current to 1µA. The system reactivates upon detection of a valid signal.

What capacitor values are required for 3.3V operation?

For 3.3V operation, the datasheet specifies using 0.1µF capacitors for all four charge pump capacitors (C1–C4).

What is the maximum guaranteed data rate?

The device guarantees a data rate of 120kbps under worst-case load conditions. Typical operation supports data rates up to 235kbps.