MAX6347UR46

Overview

The MAX6347UR46 is a microprocessor supervisory circuit from the MAX6347 series, manufactured by Analog Devices Inc./Maxim Integrated. It monitors a single power-supply input with a fixed reset threshold voltage of 4.63V and an overvoltage threshold of 4.699V. The device features an active-high, push-pull reset output and operates within a supply voltage range up to 5.5V. It consumes a maximum supply current of 1µA and ensures correct state down to 1V. The reset timeout period is guaranteed at a minimum of 100ms. Accuracy is specified at 1.5%, and it functions across a temperature range of -40°C to +85°C in a 3-pin SC-70 package.

Feature Summary

• Provides active-high push-pull reset signal generation upon power supply monitoring
• Ultra-low supply current consumption for portable equipment efficiency
• Factory-trimmed precision thresholds ensuring reliable voltage supervision
• Compact space-saving SC-70 surface-mount packaging

Applications

• Microprocessor and digital system power supply monitoring
• Portable battery-powered equipment supervision
• 2.5V, 3V, 3.3V, and 5V powered circuit reliability enhancement

Procurement Notes

Verify the specific suffix UR46 against the official datasheet to confirm the 4.63V threshold variant. Confirm RoHS compliance status as indicated in manufacturer documentation. Check for lead-free certification if required by assembly standards. Ensure the SC-70 package matches the design footprint. Validate operating temperature range requirements against the -40°C to +85°C specification.

Selection Notes

Select this component when an active-high reset signal is required rather than the more common active-low configuration. The 4.63V threshold suits systems where the supply rail must remain stable above this level before allowing operation. Consider the 1µA max current draw for strict power budget constraints. The push-pull output eliminates the need for external pull-up resistors, simplifying board layout compared to open-drain alternatives.

Part Context

This part belongs to the MAX6346/MAX6347/MAX6348 family of ultra-low-power reset circuits. While the MAX6346 offers active-low push-pull output and the MAX6348 provides active-low open-drain output, the MAX6347 specifically delivers an active-high push-pull reset. All variants share similar low-current characteristics and compact packaging options, differing primarily in output polarity and drive type.

Replacement Considerations

The MAX6346UR46+T serves as a functional substitute if an active-low output is acceptable. The MAX6348UR46+T is another alternative featuring an active-low open-drain output. Verify that the replacement part's threshold voltage matches the 4.63V requirement and that the package dimensions are compatible with the existing PCB footprint.