Maxim Integrated MAX825MEXK-T Microprocessor Reset Circuit

The MAX825MEXK-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 and accuracy required in critical electronic applications. This device ensures that the microprocessor is reset to a known state during power-up, power-down, or brown-out conditions.

The MAX825MEXK-T features an active-low reset output, which remains asserted for a minimum reset timeout period of 140ms after V_CC has risen above the reset threshold level. This ensures that the system has sufficient time to stabilize before the processor starts operating. The reset threshold voltage for the MAX825MEXK-T is factory preset at a precise voltage level, eliminating the need for external components and adjustments.

One of the key advantages of the MAX825MEXK-T is its low supply current draw, typically 3µA, which makes it an excellent choice for portable and battery-operated applications. Its wide supply voltage range from 1.2V to 5.5V provides the flexibility to work with a variety of microprocessors and digital systems.

This device is available in a small 5-pin SOT-23 package, which is ideal for space-constrained applications. The MAX825MEXK-T operates over an extended temperature range of -40°C to +85°C, ensuring reliable performance across diverse environmental conditions.

Key features of the MAX825MEXK-T include:

• Factory-preset reset threshold voltage
• 140ms (min) reset timeout period
• Low supply current of 3µA (typ)
• Wide operating voltage range (1.2V to 5.5V)
• Operating temperature range of -40°C to +85°C
• Small 5-pin SOT-23 package

With its combination of low power consumption, small footprint, and precise monitoring capabilities, the MAX825MEXK-T from Maxim Integrated is a robust solution for enhancing system reliability in microprocessor-based applications, including portable devices, embedded systems, and other digital electronics requiring a watchful reset function.