MAX3244ECWI

Overview

The MAX3244ECWI is a full-duplex RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It features three drivers and five receivers, supporting data rates up to 250kbps. The device operates on a single +3.0V to +5.5V supply with an AutoShutdown Plus feature that reduces supply current to 1μA when inputs are inactive for over 30 seconds. It includes ±15kV ESD protection and utilizes a dual charge pump requiring four 0.1μF capacitors. The EC suffix indicates an industrial temperature range of -40°C to +85°C, and the package is a 28-pin Wide SO.

Feature Summary

• AutoShutdown Plus technology automatically enters low-power shutdown mode during inactivity and wakes upon signal detection without BIOS changes.
• Integrated dual charge pump generates internal +5.5V and -5.5V supplies from a single low-voltage source using minimal external capacitance.
• Enhanced I/O protection withstands ±15kV air-gap discharge, ±8kV contact discharge, and ±15kV human body model events.

Applications

• Notebook, subnotebook, and palmtop computers
• Cellular phones and battery-powered equipment
• Hand-held devices and peripherals such as printers

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and temperature rating. Confirm RoHS compliance status and lead-free designation through authorized distributors or direct manufacturer channels before procurement.

Selection Notes

Select this component for applications requiring multiple transmitter and receiver lines within a space-constrained design. Ensure the system supports the required 250kbps data rate and verify that the available voltage range aligns with the +3.0V to +5.5V operational specification.

Part Context

This part belongs to the MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E family of RS-232 transceivers. These devices share common features like AutoShutdown Plus and high ESD protection but differ in driver/receiver counts and maximum guaranteed data rates.

Replacement Considerations

Public confirmed substitutes include MAX3244EEAI+ and MAX3244ECAI+. Verify pinout compatibility and electrical specifications before substitution.

FAQ

How does the AutoShutdown Plus feature function?

It monitors receiver and transmitter inputs; if no valid transitions occur for more than 30 seconds, it shuts down the charge pumps to reduce current to 1μA. It reactivates upon detecting a valid signal edge.

What is the purpose of the INVALID output?

The INVALID output goes low when no valid RS-232 voltage levels are detected on any receiver input, indicating the absence of active communication signals regardless of FORCEON/FORCEOFF states.

Why is R2OUTB included on the MAX3244E?

R2OUTB provides an always-active, noninverting complementary receiver output. This allows monitoring of ring indicator applications without forward-biasing other devices connected to the standard three-state receiver outputs during shutdown.