MAX3244ECUI+T

Overview

The MAX3244ECUI+T is a low-power RS-232 transceiver 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 capabilities. It guarantees a maximum data rate of 250kbps and utilizes a dual charge pump requiring only four 0.1µF external capacitors. The component provides ±15kV ESD protection on all inputs and outputs, ensuring robust performance in portable applications.

Feature Summary

• AutoShutdown Plus functionality automatically reduces power consumption by disabling the charge pump during periods of inactivity.
• Integrated dual charge pump generates required RS-232 voltage levels using minimal external capacitance.
• Enhanced electrostatic discharge protection ensures signal integrity across all transmitter and receiver interfaces.

Applications

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

Procurement Notes

Verify that the ordering suffix matches the specific package type and temperature range required for your design. Confirm RoHS compliance status and lead-free specifications directly from the manufacturer's documentation before finalizing procurement orders.

Selection Notes

Select this component for designs requiring low standby power and high noise immunity. Ensure the application supports the 250kbps data rate limit. Verify that the system can accommodate the necessary external capacitor values for the chosen supply voltage.

Part Context

This part belongs to the MAX3224–MAX3245 family of RS-232 transceivers. It shares core architectural features with the MAX3224 and MAX3245, differing primarily in pin count and driver/receiver configuration within the same series.

Replacement Considerations

Direct functional substitutes include the MAX3224EEAI+T and MAX3245ECUI+T. Verify pin compatibility and specific data rate requirements before substituting these components.

FAQ

How does the AutoShutdown Plus feature operate?

The circuitry monitors receiver and transmitter inputs. If no valid transitions are detected for more than 30 seconds, the internal charge pumps shut down, reducing supply current to approximately 1µA until activity resumes.

What is the purpose of the INVALID output?

The INVALID output indicates whether valid RS-232 voltage levels are present on the receiver inputs. It asserts low when no valid signal is detected, independent of the shutdown state.

Can the MAX3244 drive serial mice?

Yes, the MAX3244 and MAX3245 are specifically designed to power serial mice while operating from low-voltage supplies, having been tested with major manufacturers' devices.