Maxim Integrated MAX6412UK23 Microprocessor Reset Circuit

The MAX6412UK23 from Maxim Integrated is a compact, high-precision microprocessor (μP) supervisory circuit designed to monitor power supplies in digital systems. It ensures that the microprocessor is reset to a known state during power-up, power-down, or brown-out conditions. The device is specifically tailored to maintain system integrity by monitoring the system voltage and asserting a reset signal whenever the monitored voltage drops below a predefined threshold.

This particular model, the MAX6412UK23, comes in a space-saving SOT23 package, making it an ideal choice for portable and space-constrained applications. The device features a factory-set reset threshold voltage of 2.32V, which is suitable for low-voltage operation in 2.5V and 3.3V systems. The reset output remains asserted for a minimum reset timeout period of 140ms after VCC rises above the reset threshold, ensuring a proper system reset.

The MAX6412UK23 offers several key features that make it a reliable and versatile choice for system designers. These include:

• A low supply current of 1.5μA, which is ideal for battery-operated equipment.
• An active-low, push-pull RESET output, which provides a direct interface to microprocessors with bidirectional reset pins.
• An immunity to short VCC transients, ensuring stable operation under noisy conditions.
• No external components are required, which simplifies design and reduces overall system cost.

With its built-in hysteresis to prevent erratic reset operation when the input voltage is near the threshold, the MAX6412UK23 is designed for robust performance. It is commonly used in a wide range of applications, including portable/battery-powered equipment, embedded controllers, computers, and intelligent instruments.

Overall, the Maxim Integrated MAX6412UK23 microprocessor reset circuit is a reliable and efficient solution for managing system integrity through voltage monitoring and reset control. Its low power consumption and small footprint make it an excellent choice for designers looking to enhance the stability and performance of their digital systems.