Maxim Integrated MAX6421XS29+T Microprocessor Supervisory Circuit

The Maxim Integrated MAX6421XS29+T is a high-quality microprocessor (µP) supervisory circuit designed to monitor power supplies and microprocessor activity in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in system designs. This device is particularly suitable for portable and space-constrained applications due to its small size.

The MAX6421XS29+T offers a precise factory-set reset threshold voltage of 2.925V, which ensures that the µP resets reliably and operates correctly during power-up, power-down, and brown-out conditions. Once VCC falls below the reset voltage threshold, the reset output remains asserted for a minimum reset timeout period of 140ms after VCC rises above the reset threshold. This feature ensures that the system has sufficient time to stabilize before the processor is allowed to run.

This supervisory circuit also includes a manual reset input, allowing the system to be reset with an external pushbutton or logic signal. The reset output is available in either an active-low push-pull or active-low open-drain configuration, providing flexibility in interfacing with different microprocessor or logic systems. The MAX6421XS29+T is designed to consume minimal power, with a typical supply current of only 1.2µA, which is ideal for battery-powered equipment.

Offered in a compact, 4-pin SC70 package, the MAX6421XS29+T is designed for surface-mount technology (SMT) and is available on tape and reel (denoted by the +T suffix). This packaging is suitable for automated assembly processes and helps in reducing the overall footprint on the PCB. Maxim Integrated's commitment to quality ensures that this supervisory circuit maintains stability over temperature variations and provides reliable performance in a range of applications, including computers, controllers, intelligent instruments, and portable consumer products.

With its combination of features, the MAX6421XS29+T is an excellent choice for designers looking for a simple, efficient, and reliable solution to protect their digital systems against the consequences of unpredictable power supply conditions.