Product Overview: MAX691AMJE/883B from Maxim Integrated

The MAX691AMJE/883B is a highly reliable, precision microprocessor (µP) supervisory circuit designed by Maxim Integrated 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, computers, controllers, and intelligent instruments.

Key Features:

• Power Supply Monitoring: The MAX691AMJE/883B ensures that the power supply voltage remains within threshold limits, providing a reset output during power-up, power-down, and brownout conditions. The reset output remains operational with VCC as low as 1V.
• Battery Backup Switching: This component includes a battery backup switching circuitry that automatically switches to a backup battery when the primary power supply fails, ensuring uninterrupted operation of the memory and real-time clock.
• Memory Write Protection: During power failures, the device protects against erroneous writing to memory by providing a write protection signal for CMOS RAM, EEPROM, or other memory types.
• Watchdog Timer: The integrated watchdog timer improves system reliability by initiating a system reset if the microprocessor gets stuck in a runaway or an erroneous state.
• Manual Reset Input: A manual reset input allows for a system reset to be triggered with an external pushbutton or logic signal, offering an additional level of control.

Applications:

• Microprocessor systems
• Computers and servers
• Embedded systems
• Industrial controllers
• Portable/battery-powered equipment

The MAX691AMJE/883B is encapsulated in a 16-pin JEDEC package, ensuring compatibility with standard sockets and ease of integration into existing designs. Its military-grade standard (883B) underscores its reliability and suitability for use in harsh environments and mission-critical applications.

With Maxim Integrated's reputation for quality, this supervisory circuit is an excellent choice for designers looking to enhance system reliability and performance with minimal additional cost and space requirements.