Maxim Integrated MAX6808UR26-T Microprocessor Reset Circuit

The MAX6808UR26-T from Maxim Integrated is a highly reliable and compact microprocessor (μP) supervisory circuit designed to monitor power supplies in digital systems. It provides a significant layer of protection by ensuring that the μP and its peripherals are reset properly during power-up, power-down, or brown-out conditions. This component is essential for maintaining the integrity and stable operation of microprocessor-based systems.

This supervisory circuit features a preset factory-trimmed reset threshold voltage of 2.63V, which is suitable for monitoring 2.7V to 3.3V power supplies. The MAX6808UR26-T asserts a reset signal whenever the VCC supply voltage falls below the threshold, keeping the reset output active for a minimum of 140ms after VCC has risen above the reset threshold. This ensures that the system has sufficient time to stabilize before the processor starts operating.

One of the key advantages of the MAX6808UR26-T is its low power consumption, drawing a quiescent current of only 1.2μA, making it an ideal choice for portable and battery-operated applications where power efficiency is critical. The device comes in a compact SOT-23 package, which is highly valued for space-constrained designs.

Additionally, the MAX6808UR26-T offers an open-drain RESET output, which allows for the flexibility to wire OR multiple devices for monitoring different power supplies within a system. This feature is particularly useful in complex systems where multiple voltages need to be supervised.

For enhanced system reliability, this supervisory circuit is designed to ignore fast transients on the VCC line, preventing false resets from being triggered by noise or ripple on the power supply. This makes the MAX6808UR26-T an excellent choice for noisy environments where power supply stability cannot be guaranteed.

The MAX6808UR26-T operates over a wide temperature range of -40°C to +125°C, catering to industrial applications that require operation under extreme conditions. Its robust design and precise voltage monitoring capabilities make it a trusted solution for safeguarding microprocessor systems across a variety of sectors, including consumer electronics, telecommunications, and automotive industries.

Overall, the Maxim Integrated MAX6808UR26-T is a versatile and reliable component that provides critical protection for digital systems, ensuring proper operation and enhancing overall system stability.