MAX3244EAI+

Overview

The MAX3244EAI+ is a true RS-232 transceiver from the MAX3224–MAX3245 family, manufactured by Analog Devices/Maxim Integrated. It operates on 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 0.1µF capacitors for operation. The component is housed in a 28-pin SSOP package and supports an operating temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by shutting down internal circuitry during periods of inactivity or cable disconnection.
• Integrated dual charge pump generates required RS-232 voltage levels using minimal external capacitance.
• Dedicated R2OUTB pin provides continuous monitoring of receiver activity even when other outputs are in high-impedance shutdown mode.

Applications

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

Procurement Notes

Verify the specific ordering suffix 'EAI+' against official manufacturer documentation to confirm the exact package type (SSOP) and industrial temperature rating (-40°C to +85°C). Ensure compatibility with system voltage requirements and capacitor selection guidelines before procurement.

Selection Notes

Select this component for applications requiring low-power standby modes and reliable RS-232 communication at data rates up to 250kbps. Consider the MAX3245 if a higher data rate of 1Mbps is necessary, or the MAX3241E series if lower quiescent current in shutdown is prioritized over the AutoShutdown Plus wake-up behavior.

Part Context

The MAX3244EAI+ belongs to the MAX3224–MAX3245 family of 3V-powered EIA/TIA-232 interface devices. This family shares common architectural features such as the AutoShutdown Plus feature and dual charge pump topology, differing primarily in guaranteed data rates and specific output configurations like the READY signal presence.

Replacement Considerations

The MAX3245 serves as a direct functional substitute within the same package offering a higher 1Mbps data rate. For legacy replacements, verify pinout compatibility with older AutoShutdown variants like the MAX3221 or MAX3223, noting differences in control logic and output states.