MAX3244EAI+T

Overview

The MAX3244EAI+T is a low-power RS-232 transceiver from Analog Devices/Maxim Integrated, operating on a single +3.0V to +5.5V supply. It features three drivers and five receivers with full-duplex communication capability. The device guarantees a maximum data rate of 250kbps and achieves a typical supply current of 1µA through AutoShutdown Plus technology. It utilizes a dual charge pump requiring four small 0.1µF capacitors for operation. The component includes an INVALID output for valid signal detection and operates within a temperature range of -40°C to +85°C in a 28-pin SSOP package.

Feature Summary

• AutoShutdown Plus functionality automatically reduces supply current to 1µA when the interface is inactive or disconnected, waking up upon valid signal transitions without BIOS modifications.
• Integrated dual charge pump generates required RS-232 voltage levels using only four external 0.1µF capacitors, enabling true RS-232 performance from low-voltage supplies.
• INVALID output pin actively monitors receiver inputs to detect valid RS-232 voltage levels, remaining independent of shutdown control states.

Applications

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

Procurement Notes

Verify that the ordering suffix 'E' confirms the industrial temperature range (-40°C to +85°C) and 'AI' specifies the 28-pin SSOP package. Confirm '+T' indicates tape-and-reel packaging if applicable. Ensure the component is lead-free and RoHS compliant as indicated by the '+' designation. Cross-reference the manufacturer part number with official distributor catalogs to confirm availability status.

Selection Notes

Select this component for applications requiring low power consumption during idle states via AutoShutdown Plus. Choose the MAX3244 variant specifically when a guaranteed data rate of 250kbps is sufficient, distinguishing it from the MAX3245 which supports 1Mbps. Ensure the design accommodates the 28-pin SSOP footprint and requires four external capacitors for the charge pump circuitry.

Part Context

The MAX3244 belongs to the MAX3224–MAX3227/MAX3244/MAX3245 family of 3V-powered EIA/TIA-232 communications interfaces. This series shares common features such as AutoShutdown Plus and dual charge pumps, differing primarily in driver/receiver counts and maximum data rates. The MAX3244 specifically provides three drivers and five receivers optimized for standard serial port implementations.

Replacement Considerations

The MAX3245 serves as a functional substitute offering identical pinouts and features but with a guaranteed 1Mbps data rate instead of 250kbps. Other family members like the MAX3224 provide two drivers and two receivers in a 20-pin package, requiring schematic adjustments.