Maxim Integrated MAX6747KA46 Low-Power Microprocessor Supervisory Circuit

The Maxim Integrated MAX6747KA46 is a compact, highly reliable supervisory circuit designed to monitor power supplies and microprocessor activity in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in systems with a 4.63V power-supply voltage.

This supervisory circuit helps to ensure that the digital system retains proper functionality by monitoring the power supply voltage. In the event that the supply voltage falls below a preset threshold, the MAX6747KA46 asserts a reset signal to reset the system, thereby preventing any erratic behavior that may occur due to insufficient power. The reset output remains asserted for a preset timeout period after the supply voltage rises above the reset threshold, ensuring the system has adequate time to stabilize before resuming operation.

Key features of the MAX6747KA46 include:

• Factory-Set Reset Threshold: The reset threshold is preset at the factory to 4.63V, which is suitable for systems that operate around a 5V supply.
• Manual Reset Input: A manual reset input allows for an external signal to trigger a system reset, providing an additional layer of system control.
• Low Power Consumption: The device is designed for low-power operation, making it ideal for power-sensitive applications.
• Debounced Manual Reset Input: This feature ensures that the manual reset is noise resistant, preventing false triggers due to transient noise spikes.
• Immune to Short VCC Transients: The MAX6747KA46 is designed to ignore brief drops in supply voltage, which helps avoid unnecessary system resets.

This supervisory circuit comes in a compact SOT23 package, making it easy to incorporate into space-constrained designs. It is commonly used in applications such as computers, controllers, intelligent instruments, portable/battery-powered equipment, and other microprocessor-based systems that require precise monitoring and control of the power supply voltage.

With the Maxim Integrated MAX6747KA46 supervisory circuit, designers can enhance system reliability and performance by ensuring that their systems operate within the intended power supply parameters, without the need for complex and costly additional circuitry.