The MAX691AMJE from Maxim Integrated is a highly integrated microprocessor supervisory circuit designed to monitor power supplies in microprocessor and digital systems. It provides a significant number of features to enhance system reliability under fault conditions, such as power failure, low battery, and watchdog timer faults.

Key Features

• Power Supply Monitoring: This device ensures that the microprocessor is reset to a known state during power-up, power-down, or brown-out conditions. It monitors the power supply voltage and keeps the microprocessor in reset until that voltage reaches a stable and safe level for operation.
• Watchdog Timer: The MAX691AMJE includes a watchdog timer that periodically checks for system malfunctions. If the microprocessor does not provide a periodic signal to the watchdog timer, the device will assert a system reset, ensuring that the system can recover from a failure.
• Battery Backup Switching: In the event of a power failure, the MAX691AMJE automatically switches to a backup battery to maintain power to the microprocessor's memory, real-time clock, and other critical components.
• Low Battery Detection: The device features a low battery detection circuit that warns the processor of an impending power failure, allowing for a graceful shutdown or transition to a low-power state.
• Manual Reset Input: An additional feature is the manual reset input, which allows for an external signal to initiate a system reset, providing an extra level of control to the system operator.

Applications

The MAX691AMJE is suitable for a wide range of applications that require robust power management and system integrity checks, including:

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

Package and Quality

The device is offered in a JEDEC-standard 16-pin Ceramic Dual In-line Package (CDIP), ensuring reliable operation even in harsh environments. Maxim Integrated’s commitment to quality means that the MAX691AMJE is designed and manufactured to meet the highest standards, providing dependable performance for critical system monitoring tasks.