MAX3244CWI

Overview

The MAX3244CWI+ is a low-power RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +3.0V to +5.5V supply and features AutoShutdown Plus technology, achieving a typical 1µA supply current when inactive. The device includes three drivers and five receivers with full-duplex communication capability, guaranteeing a maximum data rate of 250kbps. It utilizes a dual charge pump requiring only four small capacitors for voltage generation. The component is housed in a 28-pin SOIC package and supports an industrial operating temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by disabling the charge pump during periods of inactivity or cable disconnection.
• Integrated INVALID output signal detects valid RS-232 receiver levels independent of shutdown states.
• Proprietary low-dropout transmitter stage ensures true RS-232 performance across the specified voltage range.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and handheld equipment
• Battery-powered peripherals and printers

Procurement Notes

Verify the specific suffix 'W' corresponds to the 28-pin SOIC package and the 'C' indicates the commercial temperature range if required, though datasheet lists E-range (-40°C to +85°C) as standard for this family. Confirm RoHS compliance status via the manufacturer's official documentation before finalizing procurement specifications.

Selection Notes

Select the MAX3244 variant specifically when a guaranteed 250kbps data rate is sufficient, as opposed to the MAX3245 which supports 1Mbps. Ensure the design accommodates the 28-pin SOIC footprint. Verify that the system requires three drivers and five receivers to match the internal configuration of this specific part number.

Part Context

This component belongs to the MAX3224–MAX3227/MAX3244/MAX3245 family of 3V-powered RS-232 transceivers. It shares core architectural features such as the dual charge pump and AutoShutdown Plus logic with siblings like the MAX3224 and MAX3245, differing primarily in pin count and guaranteed data rate specifications.

Replacement Considerations

The MAX3245 serves as a high-speed alternative within the same family, offering 1Mbps operation instead of 250kbps while maintaining identical pinouts and packaging. Other compatible devices include the MAX3224 and MAX3226, which share the 250kbps specification but may differ in driver/receiver counts or package options.