Maxim Integrated's MAX6347UR44+T Microprocessor Reset Circuit

The MAX6347UR44+T is a compact, highly precise microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant level of system reliability through its reset function, ensuring that the µP and its peripherals are reset properly during power-up, power-down, or brown-out conditions. This device is particularly well-suited for portable and space-constrained applications due to its ultra-small SOT23 packaging.

This supervisory circuit operates with a nominal reset threshold voltage of 4.40V, which makes it ideal for 5V-powered systems. In the event of a power supply irregularity, the MAX6347UR44+T asserts a reset signal to prevent system errors. The reset output remains asserted for a minimum timeout period after V<sub>CC has risen above the reset threshold, ensuring the system has sufficient time to stabilize.

One of the key features of the MAX6347UR44+T is its low supply current draw, typically just 1.2µA, which is particularly beneficial for battery-powered devices where power conservation is crucial. Additionally, the device offers a debounced manual reset input, allowing for a forced reset when needed. This is especially useful for troubleshooting and maintenance purposes.

Robustness is another hallmark of the MAX6347UR44+T, with the ability to operate over a wide temperature range of -40°C to +125°C. It also includes an active-low, push-pull reset output, which is guaranteed to be in the correct state for V<sub>CC down to 1V. This makes the device highly reliable across various environmental conditions and system voltages.

The MAX6347UR44+T is also available in a lead(Pb)-free/RoHS-compliant package, making it suitable for use in environmentally sensitive applications and adhering to modern environmental standards. With its combination of precision, low power, small size, and reliability, the MAX6347UR44+T from Maxim Integrated is an excellent choice for ensuring the stable operation of microprocessor-based systems.