The MAX691CWE+ from Maxim Integrated is a highly integrated microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and 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: Ensures that the system's power supply remains within acceptable voltage levels, thus safeguarding the µP and associated circuitry from voltage anomalies.
• Battery Backup: Features a battery backup switching function that automatically switches to a backup battery upon power failure, ensuring uninterrupted operation.
• Memory Write Protection: During power failures, the device protects against erroneous writing to memory by asserting write protection signals for CMOS RAM, EEPROM, or other memory types.
• Reset Function: The MAX691CWE+ generates a reset signal for the µP whenever the supply voltage drops below a preset threshold, maintaining system integrity.
• Watchdog Timer: A built-in watchdog timer monitors system operation and can reset the µP if it fails to strobe within a preset time frame, indicating a system malfunction.
• Low Power Consumption: Designed for energy efficiency, this component is suitable for battery-powered applications, where power conservation is critical.
• Wide Operating Temperature Range: The device is reliable over a broad temperature range, making it suitable for industrial applications.

Applications

The MAX691CWE+ is ideal for use in systems that require strict power supply monitoring and battery backup, such as:

• Computers and Servers
• Embedded Systems
• Industrial Controllers
• Portable Equipment
• Telecommunications Systems

Technical Specifications

With a supply voltage range of 4.75V to 5.5V and an operating temperature range of -40°C to +85°C, the MAX691CWE+ is available in a 16-pin Wide SO package, providing a compact solution for space-constrained applications.