MAX3244CWI+T

Overview

The MAX3244CWI+T is a low-power RS-232 transceiver from the MAX3244E series, manufactured by Analog Devices Inc./Maxim Integrated. It features three drivers and five receivers with full-duplex communication capability. The device guarantees a data rate of 250kbps and operates on a single +3.0V to +5.5V supply. It incorporates AutoShutdown Plus technology, reducing supply current to 1μA during inactivity. ESD protection is rated at ±15kV (Air-Gap), ±8kV (Contact), and ±15kV (Human Body Model). The component is housed in a 28-pin Wide SOIC package and supports an operating 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 required voltage levels using only four small capacitors.
• Robust electrostatic discharge protection ensures reliability in harsh environments.
• Dedicated INVALID output 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 'W' corresponds to the Wide SOIC package and 'I' denotes the industrial temperature range (-40°C to +85°C) as per the manufacturer's official part numbering system. Confirm RoHS compliance status for the '+T' reel packaging variant before finalizing procurement specifications.

Selection Notes

Select this component for applications requiring multiple transmitter and receiver channels within a space-constrained design. Ensure the system operates within the specified 3.0V to 5.5V voltage range and requires a guaranteed data rate up to 250kbps. Verify that the 28-pin Wide SOIC footprint aligns with the PCB layout constraints.

Part Context

This device belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E family of RS-232 transceivers. It shares core technologies like AutoShutdown Plus and high ESD protection with siblings such as the MAX3245E, which offers higher speed capabilities.

Replacement Considerations

The MAX3245E is a direct functional substitute offering increased speed up to 1Mbps while maintaining similar pinouts and features. Other compatible alternatives include the MAX3224E and MAX3226E, though they provide fewer driver/receiver channels.

FAQ

How does the AutoShutdown Plus feature function?

It automatically shuts down the internal charge pumps and disables transmitters when no valid signal transitions are detected on any input for more than 30 seconds, reducing supply current to 1μA.

What is the purpose of the INVALID output?

The INVALID output goes low when no valid RS-232 voltage levels are detected on all receiver inputs, indicating the absence of active communication signals.

Does the MAX3244E have a READY output?

No, the MAX3244E does not feature a READY output; this feature is available on other members of the family like the MAX3224E and MAX3225E.