Maxim Integrated MAX706REUA+ Microprocessor Supervisory Circuit

The MAX706REUA+ from Maxim Integrated is a compact, highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies and µP activity in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V-powered circuits.

This supervisory circuit ensures that the µP is reset to a known state during power-up, power-down, or brown-out conditions. The MAX706REUA+ asserts a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. This feature is crucial for systems where a stable and clear reset signal is necessary to ensure proper operation during power fluctuations or when the supply voltage is not guaranteed to be stable.

Key features of the MAX706REUA+ include:

• Power Supply Monitoring: Precision monitoring of 5V power-supply voltages is provided with factory-set reset threshold voltages (typically 4.65V).
• Reset Output: The active-low reset output is guaranteed valid to VCC = 1V, allowing for low voltage operation.
• Manual Reset Input: A manual reset input is provided, which allows for a push-button to trigger a system reset, offering an additional layer of system control.
• Low Power Consumption: With a typical supply current of only 12µA, the MAX706REUA+ contributes to overall power efficiency, making it suitable for portable and battery-operated equipment.
• Compact Package: The device is available in an 8-pin µMAX package, which is ideal for space-constrained applications.

The MAX706REUA+ is designed to interface directly with microcontrollers and microprocessors, providing a robust power management solution that enhances system stability and reliability. It is commonly used in applications such as computers, controllers, intelligent instruments, portable/battery-powered equipment, and embedded systems.

With its combination of features, the MAX706REUA+ offers a straightforward and cost-effective way to improve system integrity and ensure that digital systems function correctly even in the face of power supply uncertainties.