Maxim Integrated MAX690ACSA-T Microprocessor Supervisory Circuit

The MAX690ACSA-T is a highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in µP and digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in conjunction with +5V-powered circuits. This supervisory circuit is perfect for use in microprocessor systems, computers, controllers, and intelligent instruments where efficient power monitoring is critical.

The MAX690ACSA-T offers a variety of features that make it an essential component for system stability. It includes a precision voltage monitor that keeps a close watch on the +5V power-supply voltage. This device ensures that the µP is reset to a known state during power-up, power-down, and brownout conditions. Additionally, the MAX690ACSA-T has a debounced manual reset input that allows for a manual system reset.

One of the key functions of the MAX690ACSA-T is to provide a reset signal to the µP for a minimum of 140ms after VCC has risen above the reset threshold level. This ensures that the µP and other ICs are properly reset and operational before normal operation begins. The reset threshold level is factory-set with high precision, which means no external adjustments are needed.

This supervisory circuit also features a watchdog timer that can be set by an external capacitor to provide a periodic reset signal if the µP fails to provide a watchdog kick within a preset time frame. This feature enhances system reliability by ensuring that if the µP hangs or fails to operate, the system can still recover.

The MAX690ACSA-T is available in an 8-pin SOIC package, making it convenient for integration into a wide range of applications. It operates over a wide temperature range of -40°C to +85°C, which ensures stable operation in various environmental conditions. With its combination of reset and watchdog functionality, the MAX690ACSA-T is an essential component for creating robust and reliable digital systems.

Overall, the Maxim Integrated MAX690ACSA-T supervisory circuit is a cost-effective solution for system management, providing the necessary protection and monitoring to ensure the smooth operation of electronic systems.