Maxim Integrated MAX6315US43D3 Microprocessor Reset Circuit

The MAX6315US43D3 is a compact, highly reliable microprocessor (µP) supervisory circuit designed to maintain system integrity during power failures or unpredictable events in digital systems. Manufactured by Maxim Integrated, this reset circuit offers an essential function by monitoring the supply voltage and keeping the µP within safe operating conditions. It is specifically designed to assert a reset signal to the µP whenever the VCC supply voltage drops below a preset threshold, ensuring that the µP restarts properly during power-up, power-down, or brown-out conditions.

The MAX6315 series features a preset VCC threshold voltage of 4.3V, which is ideal for 5V-powered systems. With its precision temperature-compensated voltage reference and comparator circuit, the MAX6315US43D3 guarantees a ±1.5% reset threshold accuracy over the entire temperature range of -40°C to +85°C. This accuracy is crucial for systems that require consistent and reliable operation across various environmental conditions.

One of the key features of the MAX6315US43D3 is its extremely low supply current of 1µA (typical), which makes it suitable for use in power-sensitive applications. The device is provided in a compact SOT-143 package, making it easy to integrate into space-constrained designs without compromising on performance.

Additional features of this reset circuit include a debounced manual reset input that allows for a forced reset, as well as an active-low reset output. The reset output remains asserted for a minimum of 140ms after VCC has risen above the reset threshold, ensuring that the µP has adequate time to stabilize before it begins operation. This push-pull output does not require an external pull-up resistor, simplifying the design and reducing component count.

The MAX6315US43D3 is an ideal choice for portable devices, computers, controllers, and other microprocessor-based systems that require a robust reset function to maintain operational stability. Its ease of use, low power consumption, and high accuracy make it a valuable component in any system designer's toolkit.

For further information and full specifications, designers are encouraged to consult the datasheet provided by Maxim Integrated, ensuring that the MAX6315US43D3 meets the specific needs of their application.