Maxim Integrated's MAX691CWE Microprocessor Supervisory Circuit

The MAX691CWE from Maxim Integrated is a highly integrated microprocessor supervisory circuit designed to monitor power supplies in microprocessor and digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V-powered circuits. The MAX691CWE offers a variety of features that make it a comprehensive solution for system management and protection.

Key Features

• Power Supply Monitoring: The device constantly monitors the power supply voltage and keeps the system in reset for a minimum of 200ms after the power supply has reached its nominal value, ensuring a stable system start-up.
• Battery Backup Switching: An on-chip gating circuit controls the backup battery to maintain memory and real-time clock operation when the main power is lost.
• Watchdog Timer: The MAX691CWE includes a watchdog timer that must be periodically cleared by the microprocessor. If the microprocessor fails to clear the watchdog, the device will issue a system reset, ensuring proper system operation and recovery from a failure.
• Manual Reset Input: A manual reset input allows for an external trigger to initiate a system reset, providing an additional level of control.
• Debounced TTL/CMOS-Compatible Inputs: The inputs to the device are debounced and compatible with both TTL and CMOS logic levels, allowing for easy integration into a variety of systems.

Applications

The MAX691CWE is suitable for use in a wide range of applications, including:

• Microprocessor systems
• Computers
• Controllers
• Intelligent instruments
• Automotive systems

Package and Reliability

Maxim Integrated's MAX691CWE comes in a 16-pin Wide SO package, offering a compact footprint for space-constrained applications. It is designed to operate over a wide temperature range, ensuring reliability and performance under varying environmental conditions. With its combination of protective features, the MAX691CWE is an essential component for safeguarding sensitive microprocessor systems from power irregularities and system errors.