The MAX691ACSE+T from Maxim Integrated is a highly integrated microprocessor 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 applications.

Key Features

• Power Supply Monitoring: Ensures that the system's microprocessor is reset to a known state during power-up, power-down, and brownout conditions. The reset output remains operational with VCC as low as 1V.
• Battery Backup Switching: Includes a battery backup capability that automatically switches to a backup battery when the primary power supply fails, ensuring uninterrupted operation.
• Watchdog Timer: Features a watchdog timer that must be periodically reset by the microprocessor within a selectable time frame to prevent system lockup.
• Manual Reset: A manual reset input allows for a reset to be triggered with an external pushbutton or logic signal.

Applications

The MAX691ACSE+T is ideal for use in microprocessor systems, computers, controllers, and intelligent instruments where reliable operation is critical. Its features make it particularly suitable for portable and battery-powered applications.

Package and Quality

This supervisory circuit is available in a 16-pin narrow SO package, making it compact and suitable for space-constrained applications. The MAX691ACSE+T is provided in tape-and-reel form, facilitating efficient handling and assembly during the manufacturing process. Maxim Integrated ensures high-quality standards, providing robust performance for industrial-grade requirements.

Technical Specifications

• Supply Voltage Range: 4.75V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Reset Threshold Voltage: Typically 4.65V
• Reset Active Time: 200ms min
• Watchdog Timeout: 1.6s min

With its comprehensive set of features, the MAX691ACSE+T supervisory circuit is a reliable solution for system monitoring and control, ensuring that your digital systems operate with the highest level of integrity.