MAX3244EEWI

Overview

The MAX3244EEWI+ is a low-power RS-232 transceiver manufactured by Analog Devices (Maxim Integrated). It features three drivers and five receivers, supporting full-duplex communication at data rates up to 250kbps. The device operates on a single +3.0V to +5.5V supply and achieves a typical supply current of 1μA through AutoShutdown Plus technology. It includes ±15kV ESD protection on all inputs and outputs. The component is housed in a 28-pin Wide SOIC package and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption when the interface is idle or disconnected.
• Integrated dual charge pump generates internal voltage rails from a single low-voltage supply.
• Robust electrostatic discharge protection ensures reliability in harsh environments.
• Dedicated INVALID output pin indicates the presence of valid RS-232 signal levels.

Applications

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

Procurement Notes

Verify the specific suffix 'EWI+' against official manufacturer documentation to confirm the exact package type, lead finish, and RoHS compliance status. Ensure the ordering code matches the required operating temperature range and pin configuration for your design implementation.

Selection Notes

Select this component when designing systems requiring multiple receiver lines alongside standard transmitter capabilities. The inclusion of the INVALID output facilitates efficient power management strategies by allowing the system to detect cable connection states without continuous active monitoring.

Part Context

This part belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E family of RS-232 transceivers. These devices share common architectural features such as the AutoShutdown Plus circuitry and dual charge pumps, differing primarily in driver/receiver counts and maximum guaranteed data rates.

Replacement Considerations

The MAX3245E serves as a direct functional substitute within the same series, offering identical pinouts and features but with a guaranteed data rate of 1Mbps instead of 250kbps.

FAQ

How does the AutoShutdown Plus feature reduce power consumption?

It monitors receiver and transmitter inputs; if no valid transitions are detected for more than 30 seconds, it shuts down the internal charge pumps, reducing supply current to approximately 1μA.

What is the function of the INVALID output pin?

The INVALID output goes low when no valid RS-232 voltage levels are detected on any receiver input, indicating that the cable may be disconnected or inactive.

Does the MAX3244E have a READY output pin?

No, the MAX3244E does not include a READY output pin. This feature is available only on the MAX3224E, MAX3225E, MAX3226E, and MAX3227E models.