MAX6347XR39-T

Overview

The MAX6347XR39-T is a microprocessor supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It monitors power supply voltages and asserts an active-high reset signal when the VCC supply declines below a preset threshold of 3.9V. The device features a minimum power-on reset pulse width of 100ms and operates with ultra-low supply currents, typically 1µA maximum. It is designed for portable equipment and digital systems powered by 2.5V, 3V, 3.3V, or 5V rails. The component is housed in a space-saving SC-70 (SOT-323) package with three pins.

Feature Summary

• Provides precise monitoring of standard power-supply voltages including 2.5V, 3V, 3.3V, and 5V systems.
• Features ultra-low supply current consumption suitable for battery-powered portable applications.
• Generates an active-high push-pull reset output to ensure system reliability during voltage transients.

Applications

• Microprocessor and digital system power supply supervision
• Portable electronic equipment requiring low standby current
• Battery-operated devices needing reliable voltage monitoring

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging configuration. Confirm the 'XR39' designation corresponds to the 3.9V threshold variant. Check manufacturer documentation for RoHS compliance status and lead-free certification details prior to integration.

Selection Notes

Select this component when an active-high reset output is required rather than the common active-low configuration. Ensure the fixed 3.9V threshold aligns with the target supply rail. Consider the SC-70 package size constraints and the 100ms minimum timeout duration for system startup requirements.

Part Context

This part belongs to the MAX6347 series of ultra-low-power reset circuits. It shares architectural similarities with the MAX6326/27/28 and MAX6346/48 families but is distinguished by its active-high push-pull output stage. The series is designed to eliminate external components and adjustments for standard voltage levels.

Replacement Considerations

The MAX6348XR39+T serves as a functional alternative within the same family, though it provides an active-low open-drain output instead of active-high push-pull. Verify output polarity compatibility before substitution.