MAX6347XR44

Overview

The MAX6347XR44 is a microprocessor supervisory circuit manufactured by Analog Devices Inc. (Maxim Integrated). It monitors power supply voltages and asserts an active-high, push-pull reset signal when the VCC voltage declines below a preset threshold of 4.4V. The device maintains this reset state for a minimum timeout period of 100ms after VCC rises above the threshold. It operates within a supply voltage range of 1.2V to 5.5V and consumes a maximum supply current of 1µA. The component is housed in a space-saving SC-70-3L package and is rated for operation between -40°C and +85°C.

Feature Summary

• Provides ultra-low power consumption with a maximum supply current of 1µA, suitable for portable equipment.
• Features a precision factory-trimmed reset comparator designed to ignore fast transients on the VCC line.
• Delivers an active-high, push-pull reset output that remains asserted until the supply voltage exceeds the threshold for the specified timeout duration.

Applications

• Monitoring power supplies in microprocessor systems
• Digital system supervision for 2.5V, 3V, 3.3V, and 5V circuits
• Portable equipment requiring low standby current

Procurement Notes

Verify the specific suffix 'XR44' against the manufacturer's official datasheet to confirm the exact 4.4V threshold and active-high output configuration. Ensure the SC-70-3L package matches your PCB footprint requirements. Check current availability status as distribution channels may list limited stock or obsolete status for this specific variant.

Selection Notes

Select the MAX6347XR44 when an active-high reset signal is required rather than the more common active-low configuration found in similar Maxim devices like the MAX6346. This part is appropriate for designs needing a 4.4V monitoring threshold with minimal quiescent current draw. Confirm compatibility with the target logic levels and ensure the 100ms minimum timeout meets the system's power-up sequencing requirements.

Part Context

The MAX6347 belongs to the MAX63xx series of microprocessor supervisory circuits from Maxim Integrated. These devices are designed to eliminate external components and adjustments for standard voltage rails. The MAX6347 specifically distinguishes itself within the family by providing an active-high output, whereas counterparts like the MAX6346 offer active-low outputs. All variants share similar low-power characteristics and compact packaging options.

Replacement Considerations

The MAX6346XR44+T is a functional substitute offering identical electrical specifications but with an active-low reset output. Verify if the system logic can accommodate the inverted signal polarity before substituting.