Maxim Integrated MAX693ACPE+ Microprocessor Supervisory Circuit

The MAX693ACPE+ from Maxim Integrated is a robust microprocessor (µP) supervisory circuit designed to monitor power supplies and microprocessor activity in digital systems. It provides excellent circuit reliability and low-cost system monitoring, which makes it ideal for use in microprocessor systems, computers, controllers, and intelligent instruments.

This supervisory circuit offers several key features that ensure the stable operation of a microprocessor system. It includes functions such as power-on reset control, watchdog timer, battery backup switching, and write protection for memory. The MAX693ACPE+ ensures that the microprocessor will start in a known state by asserting a reset signal whenever the VCC supply voltage falls below the reset threshold level. The reset signal remains asserted for a period after VCC has risen above the reset threshold to allow for power supply stabilization.

The integrated watchdog timer improves system reliability by monitoring the microprocessor activity. If the microprocessor fails to provide a watchdog signal within a preset time frame, the MAX693ACPE+ will issue a system reset, thereby helping to recover from a software lock-up or other faults.

Battery backup switching is another critical feature of the MAX693ACPE+. It automatically switches to a backup battery when the main power supply fails, ensuring that volatile memory and real-time clocks continue to operate during a power outage. Additionally, the chip's write protection capability guards against inadvertent writes to memory, particularly during power-up, power-down, and brownout conditions, which could otherwise lead to data corruption.

The MAX693ACPE+ is available in a 16-pin PDIP package and operates over the commercial temperature range. It is designed to interface directly with a 4.5V to 5.5V powered microprocessor, making it a versatile component for a wide range of applications.

Overall, the Maxim Integrated MAX693ACPE+ is a trusted, high-quality solution for system monitoring, with its combination of reset logic, watchdog timer, and battery backup functions ensuring that digital systems maintain their integrity and reliability under various conditions.