The ADM691AN is a high-performance microprocessor supervisory circuit produced by Analog Devices Inc., designed to provide effective power management and monitoring solutions for microprocessor systems. This integrated circuit ensures that the microprocessor and other critical system components operate reliably by monitoring the power supply voltage and providing essential control functions.

Key Features

• Power Supply Monitoring: The ADM691AN monitors the system's power supply voltage and ensures that it remains within acceptable thresholds for reliable operation. It provides an active-low reset output that is asserted when the supply voltage drops below a preset threshold, preventing the system from operating under potentially damaging undervoltage conditions.
• Battery Backup Switching: This device includes an automatic backup battery switchover function that seamlessly switches to an external battery when the main power supply fails, ensuring uninterrupted operation of memory and real-time clocks.
• Watchdog Timer: A built-in watchdog timer ensures that the system does not lock up by requiring periodic resetting from the microprocessor. If the microprocessor fails to reset the watchdog within a preset time frame, the ADM691AN will issue a system reset.
• Power-On Reset: The ADM691AN generates a reset pulse when the power supply initially turns on, setting the system into a known start-up state and ensuring that the microprocessor and other system components initialize correctly.
• Low Power Consumption: Designed for power-sensitive applications, this device operates with low quiescent current, minimizing the impact on the overall power budget of the system.

Applications

The ADM691AN is ideal for use in a variety of applications where reliable system operation is critical. These include:

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

Product Specifications

The ADM691AN is offered in an 8-pin PDIP (Plastic Dual In-line Package) and is characterized for operation over the -40°C to +85°C temperature range. With its robust feature set, the ADM691AN from Analog Devices Inc. is a reliable choice for system designers looking to enhance the operational stability and integrity of their microprocessor-based systems.