MAX3244ECWI+

Overview

The MAX3244ECWI+ is a 28-pin RS-232 transceiver in a TSSOP package, operating from +3.0V to +5.5V with ±15kV ESD protection. It features three drivers and five receivers for full-duplex communication at up to 250kbps. The device utilizes AutoShutdown Plus technology to achieve a typical supply current of 1μA during inactivity. It includes an INVALID output signal and requires four external 0.1μF capacitors for its dual charge pump.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption when the interface is idle or disconnected.
• Integrated INVALID output pin provides real-time status indication of valid RS-232 signal presence on receiver inputs.
• Robust electrostatic discharge protection ensures reliability across transmitter outputs and receiver inputs.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and battery-powered equipment
• Hand-held devices and peripherals

Procurement Notes

Verify that the specific suffix 'CW' corresponds to the required 28-pin TSSOP package variant. Confirm the temperature range matches the application environment requirements. Ensure the ordering information aligns with the manufacturer's current production status for this exact part number.

Selection Notes

Select this component when a system requires multiple serial ports within a single integrated circuit. The high ESD tolerance makes it suitable for exposed connector interfaces. Verify that the 250kbps data rate meets the bandwidth requirements of the connected UART peripherals.

Part Context

This device belongs to the MAX3244E family of low-power RS-232 transceivers. It shares core architectural features with the MAX3245E but offers a lower guaranteed data rate. The EC suffix indicates industrial temperature performance, while the WI suffix denotes the wide SOIC physical footprint.

Replacement Considerations

The MAX3245ECWI+ serves as a direct functional substitute offering higher speed capabilities. Other members of the MAX322x/MAX324x series may be compatible if driver and receiver counts are adjusted accordingly.

FAQ

How does the INVALID output function?

The INVALID output goes low when no valid RS-232 voltage levels are detected on any receiver input, indicating the absence of active signals regardless of the shutdown state.

What triggers the AutoShutdown Plus mode?

The device enters low-power shutdown after detecting no valid transitions on any receiver or transmitter input for more than 30 seconds.

Does the device require external components for operation?

Yes, the internal dual charge pump requires four small external capacitors, typically 0.1μF, to generate the necessary positive and negative voltages.