Maxim Integrated MAX693CWE Microprocessor Supervisory Circuit

The Maxim Integrated MAX693CWE is a comprehensive microprocessor (µP) supervisory circuit designed to monitor power supplies and microprocessor activity in digital systems. It provides several essential functions such as power-on reset control, watchdog timer, battery backup switching, and write protection to ensure reliable operation of microprocessor systems.

Key Features

• Power-On Reset Control: The MAX693CWE provides a reset output during power-up, power-down, and brownout conditions. The reset signal ensures that the µP starts in a known state every time power is applied.
• Watchdog Timer: The built-in watchdog timer keeps the microprocessor system functioning correctly by forcing a system reset if the microprocessor fails to strobe within a preset time interval. This feature is crucial for systems that require high reliability and fail-safe operation.
• Battery Backup Switching: In the event of a primary power failure, the MAX693CWE automatically switches to a backup battery to maintain power to the memory and real-time clock functions, thus preserving system state and data.
• Write Protection: To prevent accidental corruption of memory data during power failures, the MAX693CWE provides write protection for CMOS RAM, EEPROM, or other writable memory components.

Applications

The MAX693CWE is ideal for use in microprocessor-based systems that require strict power monitoring and control to maintain data integrity and ensure proper system behavior. Typical applications include:

• Computers and Servers
• Embedded Systems
• Industrial Controllers
• Intelligent Instruments
• Portable/Battery-Powered Equipment

Technical Specifications

The device is offered in a 16-pin Wide SO package and operates over a wide temperature range, making it suitable for various environments. It has a voltage monitoring threshold precision of ±1.5% and a reset threshold voltage designed to accommodate 5V-powered µPs. The watchdog timer can be set by external components to ensure flexibility in different system designs.

With its combination of features, the MAX693CWE from Maxim Integrated is an essential component for system designers looking to enhance the reliability and robustness of their microprocessor systems.