Maxim Integrated MAX6422XS22+T Microprocessor Reset Circuit

The MAX6422XS22+T from Maxim Integrated is a highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a significant function in ensuring system stability by resetting the microprocessor during power-up, power-down, and brownout conditions. The compact and efficient design of this component makes it an ideal choice for portable and space-constrained applications.

This supervisory circuit operates with a nominal supply voltage of 2.2V, which is suitable for low-voltage operations. It boasts a low supply current of only 1.2µA, making it exceptionally power-efficient and ideal for battery-operated devices. The MAX6422XS22+T comes in a small, 4-pin SC70 package, which is not only space-saving but also provides a reduced footprint on the PCB.

One of the key features of the MAX6422XS22+T is its precision factory-set reset threshold. This ensures accurate monitoring of the VCC supply voltage without the need for external components. When VCC falls below the factory-set reset threshold, the reset output is asserted (driven low) to reset the microprocessor. The reset output remains asserted for a minimum reset timeout period after VCC rises above the reset threshold, allowing the system to stabilize before the processor restarts. This timeout period is also precisely set by the factory, providing a predictable and reliable reset signal.

The device includes a manual reset input that allows a pushbutton or an external signal to initiate a system reset. This feature provides an additional layer of control for system diagnostics and recovery.

Designed for high reliability, the MAX6422XS22+T includes additional features such as immunity to short VCC transients and an ability to assert reset with VCC as low as 1.1V, ensuring the microprocessor is in a known state during power fluctuations. The component is available in tape and reel format, denoted by the '+T' suffix, which facilitates automated assembly and is suitable for high-volume production environments.

In summary, the MAX6422XS22+T from Maxim Integrated is a compact, efficient, and reliable solution for microprocessor system management, providing essential protection against power supply anomalies and enhancing overall system stability.