Maxim Integrated MAX803SEXR+T - Microprocessor Reset Circuit

The MAX803SEXR+T from Maxim Integrated is a compact, highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a crucial function by ensuring that the µP and its peripherals are reset properly during power-up, power-down, or brown-out conditions. This device is an essential component for maintaining system integrity and preventing code execution errors due to incomplete system initialization.

Encased in a small, 3-pin SOT-323 package, the MAX803SEXR+T is optimized for space-constrained applications. Its tiny footprint makes it an ideal choice for portable devices, where efficiency and board space are at a premium. Despite its small size, this reset circuit does not compromise on performance, offering a precise monitoring capability for 3.3V power supplies.

One of the key features of this device is its ability to assert a reset signal whenever the VCC supply voltage declines below a preset threshold, ensuring that the µP resets cleanly during power-up, power-down, and brown-out conditions. The reset output remains asserted for a minimum of 140ms after VCC has risen above the reset threshold level, providing ample time for the system to stabilize.

Additionally, the MAX803SEXR+T offers a low supply current of only 4µA (typ), making it an energy-efficient choice for battery-operated applications. This characteristic is particularly important in today's energy-conscious electronic environment, where extending battery life is often a critical design goal.

The device also features an active-low RESET output, which is guaranteed to be in the correct state for VCC down to 1V, ensuring reliable operation even during low-voltage conditions. This makes the MAX803SEXR+T a robust choice for systems that experience wide fluctuations in power supply levels.

In summary, the Maxim Integrated MAX803SEXR+T microprocessor reset circuit is a high-quality, reliable solution for system monitoring and reset functions. Its small size, low power consumption, and precise voltage monitoring capabilities make it an excellent choice for a wide range of applications, including portable devices, computers, controllers, and intelligent instruments.