Maxim Integrated's MAX819LEUA+ Microprocessor Reset Circuit

The MAX819LEUA+ is a highly efficient microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in µP and digital systems. It provides a significant level of protection by ensuring that the µP boots up in a predictable state, even in the event of a power failure or brownout condition. This component is an essential tool for maintaining system reliability and preventing potential data loss or corruption.

Encased in a compact 8-pin µMAX package, the MAX819LEUA+ offers a range of features that make it an ideal choice for portable devices, computers, controllers, and other sophisticated electronic systems. One of the key functions of this device is to assert a reset signal to the µP whenever the VCC supply voltage declines below the preset threshold, keeping the reset active for a minimum of 140ms after VCC has risen above the reset threshold. This ensures that the µP has ample time to initialize and enter a stable operating condition.

The MAX819LEUA+ boasts a factory-trimmed reset threshold, which is set for a 4.65V reset threshold voltage, suitable for 5V-powered systems. Additionally, the device includes a manual reset input that allows for a system reset to be triggered with an external push-button or logic signal, providing an extra layer of control.

Another impressive feature of this supervisory circuit is its low supply current of only 17µA (typical), which makes it highly energy-efficient and a perfect match for battery-operated devices where power conservation is critical. The MAX819LEUA+ also supports a wide operating temperature range from -40°C to +85°C, making it versatile for various environmental conditions.

Overall, the Maxim Integrated MAX819LEUA+ is a reliable and indispensable component for ensuring the stable operation of microprocessor-based systems. Its combination of reset threshold accuracy, low power consumption, and additional control features make it a top choice for engineers looking to enhance system integrity and prevent unexpected failures.