Maxim Integrated MAX6412UK42+T Microprocessor Reset Circuit

The Maxim Integrated MAX6412UK42+T is a compact, high-precision microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when monitoring nominal system voltages from 1.8V to 5.0V. This device is ideal for portable and battery-powered equipment due to its low power consumption and small footprint.

The MAX6412UK42+T operates by asserting a reset signal whenever the VCC supply voltage falls below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. This reset delay ensures that the system has sufficient time to stabilize before the processor is allowed to run. The reset threshold for this particular model is factory-set to 4.2V, making it suitable for systems that operate around this voltage level.

One of the key features of the MAX6412UK42+T is its ability to provide a manual reset input. This allows for a system reset to be triggered with an external switch or logic signal, providing an additional layer of control. The device also includes a debounce circuit that ensures clean reset signals, free from any spurious noise that could otherwise cause unintended resets.

The MAX6412UK42+T is available in a compact SOT23-5 package, making it space-efficient for design in tight PCB layouts. With its wide operating temperature range of -40°C to +125°C, it can reliably function in various environmental conditions, from industrial to automotive applications.

Moreover, this supervisory circuit features low supply current (typically 5.5µA at VCC = 3.6V) which is crucial for battery-powered devices where power conservation is key. Its quiescent current is even lower during overvoltage conditions, further enhancing its suitability for power-sensitive applications.

In summary, the Maxim Integrated MAX6412UK42+T is a robust and reliable solution for system voltage monitoring with a fixed 4.2V threshold. It's designed to enhance the reliability of microprocessor systems by providing reset signals during power-up, power-down, and brown-out conditions. Its manual reset capability, low power consumption, and compact packaging make it an excellent choice for a wide range of applications.