MAX221EUE+

Overview

The MAX221EUE+ is a single transmit/receive RS-232 transceiver operating from a +5V supply. It features AutoShutdown technology, reducing supply current to 1µA when no valid signal is detected for 30µs. The device guarantees a data rate of 250kbps with worst-case loads of 3kΩ in parallel with 1000pF. It includes internal charge pumps requiring four 0.1µF capacitors to generate ±V supplies. The INVALID pin indicates active communication presence. Operating temperature range is -40°C to +85°C. Supply voltage range is +4.5V to +5.5V.

Feature Summary

• AutoShutdown functionality reduces power consumption by disabling the transmitter and charge pump when invalid signal levels persist.
• Integrated dual charge-pump voltage converter generates required positive and negative voltages from a single +5V source.
• INVALID output pin signals the presence of valid RS-232 levels at the receiver input.

Applications

• Maintenance and diagnostic ports
• Industrial systems
• Telecommunications equipment
• Set-top boxes

Procurement Notes

Verify the component matches the specific E suffix for extended temperature range (-40°C to +85°C) and UE package code for TSSOP-16. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor certificates prior to integration into production designs.

Selection Notes

Select this component for applications requiring low standby power without BIOS modifications. Ensure external capacitors are rated for the operating temperature range to maintain capacitance stability. Verify that the 250kbps maximum data rate meets system requirements before finalizing the design.

Part Context

This part belongs to the MAX221 family of single RS-232 transceivers. It is functionally equivalent to the MAX221CUE but offers an extended industrial temperature range. The E suffix denotes the extended temperature variant, while the UE suffix specifies the 16-pin Thin Shrink Small Outline Package (TSSOP).

Replacement Considerations

The MAX221CUE serves as a commercial grade alternative with a 0°C to +70°C range. For enhanced ESD protection, consider the MAX221E series which offers ±15kV protection compared to standard ratings.