Product Overview: MAX708 Microprocessor Supervisory Circuit

The MAX708 from Maxim Integrated is a highly reliable microprocessor (µP) supervisory circuit, designed to maintain system integrity through monitoring power supply and processor activity. This compact and efficient component is essential for applications that require precise power-on reset control and power failure detection.

The MAX708 supervisory circuit offers several key features that make it an indispensable part of any microprocessor-based system. It provides a 4.65V threshold detector for power-fail warning, battery backup switching, and chip-enable gating, ensuring that the system operates within safe voltage levels. Additionally, the circuit generates a reset signal whenever the VCC supply voltage declines below the preset threshold, maintaining a reset for a minimum of 140ms after VCC has risen above the reset threshold. This reset function is crucial for allowing the microprocessor and other peripherals ample time to initialize correctly upon power-up.

The MAX708 features a watchdog timer that must be periodically cleared by the connected microprocessor. If the microprocessor or software fails to clear the watchdog, the MAX708 will assert a system reset, providing an additional layer of system reliability. This watchdog function ensures that if the system becomes unresponsive or enters an erroneous state, it can be reset automatically to resume normal operation.

Designed with versatility in mind, the MAX708 is available in a variety of packages, including the 8-pin SO and the 8-pin µMAX, allowing for flexible integration into different system designs. The operating temperature range of 0°C to +70°C makes it suitable for commercial applications where temperature conditions are controlled.

In summary, the MAX708 microprocessor supervisory circuit from Maxim Integrated is a feature-rich solution for system management and reliability. Its reset and watchdog capabilities, combined with a precise power monitoring system, make it a valuable component for any microprocessor-based application.