MAX3221EAE

Overview

The MAX3221EAE 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 with an AutoShutdown feature reducing current to 1µA when no valid signal is detected for 30µs. The device supports data rates up to 235kbps and includes internal charge pumps generating ±5.5V using only 0.1µF capacitors at 3.3V. Operating temperature range is -40°C to +85°C.

Feature Summary

• AutoShutdown functionality reduces supply current to 1µA upon detecting invalid receiver input levels for 30µs
• Integrated dual charge pump generates ±5.5V supplies from a single low-voltage source
• Provides high electrostatic discharge protection on all transmitter outputs and receiver inputs

Applications

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

Procurement Notes

Verify the specific suffix 'E' confirms the extended industrial temperature range of -40°C to +85°C. Confirm the 'AE' designation corresponds to the 16-pin SSOP package type. Ensure compliance with RoHS directives by checking for the '+' suffix in the final ordering part number.

Selection Notes

Select this component for applications requiring minimal external capacitance and ultra-low power consumption during idle states. The integrated charge pump eliminates the need for external voltage regulators or complex power management circuits. Verify that the 235kbps maximum data rate meets system timing requirements.

Part Context

This device belongs to the MAX3221/MAX3223/MAX3243 family of 3V-powered RS-232 transceivers. While the MAX3223 offers two drivers and receivers, and the MAX3243 provides three drivers with five receivers, the MAX3221 specifically addresses point-to-point communication needs in a compact footprint.

Replacement Considerations

MAX3221CAE (Commercial temperature range)

FAQ

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

The device enters AutoShutdown mode when it senses no valid signal levels on all receiver inputs for a duration of 30µs.

What capacitor values are required for 3.3V operation?

For 3.3V operation, the datasheet specifies using 0.1µF capacitors for C1 through C4.

Can the MAX3221 interface directly with 5V logic families?

Yes, the device can directly interface with various 5V logic families, including ACT and HCT CMOS.