Maxim Integrated's MAX690ESA Microprocessor Supervisory Circuit

The MAX690ESA is a highly reliable microprocessor (µP) supervisory circuit designed and manufactured by Maxim Integrated. This essential component provides monitoring and control functions critical to the proper operation of microprocessor systems. It ensures that the µP and its associated hardware are reset during power-up, power-down, and brown-out conditions, maintaining the integrity of the system's operation.

Encased in an 8-pin SOIC package, the MAX690ESA is engineered to monitor the power supply voltage of µP systems. It generates a reset signal whenever the VCC supply voltage declines below a preset threshold, maintaining the signal for at least 140ms after VCC has risen above the reset threshold level. This feature is crucial for allowing the system's power supply and processor to stabilize before normal operation commences.

In addition to its reset function, the MAX690ESA includes a watchdog timer that can be used to monitor the µP's activity. If the µP fails to strobe the watchdog input within a preset timeout period, the MAX690ESA will assert a system reset, helping to recover from a software lock-up or other malfunction.

The device also provides a 1.3V threshold detector for power-fail warning, low battery detection, or to monitor a power supply other than +5V. This versatility makes the MAX690ESA an ideal choice for a wide range of applications, including embedded systems, computers, controllers, and intelligent instruments.

With its low power consumption and wide operating voltage range of 4.75V to 5.5V, the MAX690ESA is suitable for portable battery-operated applications. The chip's temperature range of -40°C to +85°C ensures reliable operation under various environmental conditions.

Overall, the MAX690ESA from Maxim Integrated is a trusted and efficient solution for safeguarding µP systems from the dangers of unpredictable power supply conditions, contributing to the robustness and stability of the final application.