Maxim Integrated's MAX6866UK31D3S+T Microprocessor Reset Circuit

The MAX6866UK31D3S+T from Maxim Integrated is a highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in systems with a 3.1V power supply voltage.

This compact supervisory IC ensures that the microprocessor is reset to a known state during power-up, power-down, or brown-out conditions. The reset output remains asserted for a minimum of 140ms after V_CC has risen above the reset threshold level, ensuring that the system has sufficient time to stabilize before the processor begins operation. This feature is critical for preventing system errors and data corruption during unpredictable power events.

The MAX6866UK31D3S+T comes in a small SOT-23 package, making it an ideal choice for space-constrained applications. It operates over a wide temperature range of -40°C to +85°C, suitable for industrial environments and outdoor applications where temperature variations are common.

Key features of the MAX6866UK31D3S+T include:

• Factory-set reset threshold suitable for 3.1V-powered systems
• Low supply current of 1.6µA, which is beneficial for battery-powered devices
• Manual reset input for added system control
• Immune to short V_CC transients, enhancing system reliability
• Active-low, open-drain reset output that can interface directly with the reset or enable line of the microprocessor

Applications for this supervisory circuit span a range of industries and systems, including:

• Portable/Battery-Powered Equipment
• Computers and Controllers
• Embedded Systems
• Data Storage
• Industrial Controllers
• Automotive Systems

The MAX6866UK31D3S+T is a testament to Maxim Integrated's commitment to providing integrated circuits that enhance system integrity and stability. By choosing this device, designers can ensure robust power management and protection for their digital systems.