MAX3221CUE+

Overview

The MAX3221CUE+ is a single-driver, single-receiver RS-232 transceiver in a 16-pin TSSOP package. It operates from a +3.0V to +5.5V supply and achieves 1µA current via AutoShutdown when no valid signal is detected for 30µs. The device supports data rates up to 235kbps with typical propagation delays of 0.3µs. Input thresholds range from 0.6V to 2.4V depending on VCC. Transmitter outputs swing ±5.0V to ±5.4V under load. Operating temperature is 0°C to +70°C.

Feature Summary

• AutoShutdown feature reduces supply current to 1µA upon detecting invalid receiver input levels
• Integrated dual charge pump eliminates the need for external ±12V supplies
• Requires only 0.1µF capacitors for operation at 3.3V

Applications

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

Procurement Notes

Verify the specific suffix 'CUE' indicates the commercial temperature range (0°C to +70°C) and TSSOP package type. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors before procurement.

Selection Notes

Select this component for applications requiring low-power standby modes and minimal external capacitance. Ensure the system logic voltage matches the supported 3.3V or 5V ranges. Verify that the 16-pin TSSOP footprint fits the design constraints compared to SSOP alternatives.

Part Context

This part belongs to the MAX3221/MAX3223/MAX3243 family of 3V-powered RS-232 transceivers. While the MAX3223 offers two channels and the MAX3243 provides three drivers with mouse driveability, the MAX3221 specifically targets single-channel communication needs within the same power-efficient architecture.

Replacement Considerations

MAX3221CAE+ (SSOP package)

FAQ

How does the AutoShutdown feature function?

When FORCEON is low and FORCEOFF is high, the device shuts down its onboard power supply and drivers if no valid signal level is sensed on all receiver inputs for 30µs, reducing supply current to 1µA.

What are the required capacitor values for 3.3V operation?

For 3.3V operation, C1 through C4 must be 0.1µF. For 4.5V to 5.5V operation, C1 should be 0.047µF and C2-C4 should be 0.33µF.

Can the MAX3221 interface directly with 5V logic families?

Yes, it can directly interface with 5V logic families including ACT and HCT CMOS when operating at a 5V supply voltage.