MAX709MCUA

Supervisors Overview

The MAX709MCUA is a power-supply monitor with reset, designed to provide system reset during power-up, power-down, and brownout conditions. It operates with +5V, +3.3V, or +3V powered systems. The device features a precise power-down reset threshold of 4.4V for the 'C' suffix variant. It guarantees a minimum power-on reset delay of 140ms after VCC rises above the threshold. The RESET output remains in the correct state down to 1V supply voltage. It eliminates external components and adjustments, offering low supply current of 35µA. The component is housed in an 8-pin µMAX package.

Supervisors Feature Summary

• Provides system reset during power-up, power-down, and brownout conditions
• Eliminates need for external components and adjustments
• Immune to short negative VCC transients
• Low supply current consumption

Supervisors Applications

• +5V powered systems
• +3.3V powered systems
• +3V powered systems

Supervisors Procurement Notes

Verify the specific suffix 'MCUA' against official Analog Devices/Maxim Integrated documentation, as standard datasheets typically list 'MCSA', 'MCPA', or 'TEPA'. Confirm package type (µMAX) and temperature range availability. Check for obsolescence status or lifecycle notices from the manufacturer before procurement planning.

Supervisors Selection Notes

Select this component when a simple, low-cost supervisory circuit is required for microprocessor systems. Ensure the 4.4V threshold matches the monitored rail's brownout requirements. Verify that the 140ms minimum reset delay is acceptable for the target application's startup timing constraints. Confirm compatibility with the 8-pin µMAX footprint.

Supervisors Part Context

The MAX709 belongs to the Maxim Integrated power-supply monitor family. It is part of a series available in various packages including DIP, SO, and µMAX. The 'C' designation typically indicates a specific reset threshold voltage (4.4V). The 'M' denotes the µMAX package. This family is designed for reliability in embedded systems without requiring external tuning.

Supervisors Replacement Considerations

Direct substitutes include other MAX709 variants with different packages such as MAX709MCSA+ (SOIC-8) or MAX709MCPA+ (DIP), provided the pinout and electrical characteristics match. Verify if alternative thresholds are needed.