Maxim Integrated MAX693AEWE Microprocessor Supervisory Circuit

The MAX693AEWE from Maxim Integrated is a highly reliable and robust microprocessor (µP) supervisory circuit designed to monitor power supplies and microprocessor activity in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in battery-powered systems.

Key Features

• Power Supply Monitoring: The MAX693AEWE ensures that the µP is only operational when the power supply is within acceptable limits. It achieves this by providing a precision voltage monitor that supervises +5V power supplies.
• Microprocessor Reset: It generates a reset signal whenever the VCC supply voltage declines below a preset threshold, ensuring the µP starts up in a known state. The reset signal remains asserted for an additional 350ms after VCC rises above the reset threshold, allowing the power supply and processor to stabilize.
• Battery Backup Switching: This device includes a battery backup switching circuitry that automatically switches to the battery when the power fails, maintaining memory and real-time clock operation.
• Watchdog Timer: A built-in watchdog timer ensures that the µP hangs due to a software or hardware failure are detected and managed by resetting the µP if it does not regularly toggle the watchdog input.
• Manual Reset Input: An additional manual reset input is provided, allowing for an external trigger to initiate a system reset.
• Low Power Consumption: The MAX693AEWE is designed for low power consumption, making it ideal for portable and battery-powered applications.

Applications

This supervisory circuit is well-suited for a variety of applications that require reliable system operation, including:

• Computers and Controllers
• Intelligent Instruments
• Portable/Battery-Powered Equipment
• Critical µP Power Monitoring

The MAX693AEWE is available in a 16-pin Wide SO package, ensuring compatibility with a range of PCB designs. Its operating temperature range is from -40°C to +85°C, accommodating most environmental conditions for industrial applications.

With its combination of power supply monitoring, battery backup, watchdog timer, and manual reset input, the MAX693AEWE from Maxim Integrated is an essential component for enhancing system reliability and preventing data loss in critical applications.