Maxim Integrated's MAX704: Microprocessor Supervisory Circuit

The MAX704 is a compact, highly integrated microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in µP and digital systems. It provides maximum protection for your system by ensuring a proper power-on reset and maintaining a reset output until the system voltage has stabilized and is within acceptable parameters for reliable system operation.

This supervisory circuit is specifically engineered to keep microprocessor systems safe from erratic operation during power-up, power-down, and brown-out conditions. The MAX704 offers a combination of features that make it ideal for portable and space-constrained applications, including its small footprint and low power consumption.

Key Features:

• Power Supply Monitoring: The MAX704 monitors the system VCC and keeps the µP in reset mode during power-ups and whenever the VCC falls below the factory-set reset threshold. The reset threshold can be chosen from several preset voltages to match the voltage requirements of different microprocessors.
• Manual Reset Input: A dedicated manual reset input allows for a system reset to be initiated with an external pushbutton or logic signal, providing an additional layer of control.
• Low Power Consumption: The device is designed for low power consumption, making it well-suited for battery-operated systems. Its quiescent current is typically only 17µA, which helps to extend battery life in portable applications.
• Reset Timeout: After the VCC has risen above the reset threshold, the MAX704 keeps the processor in the reset state for a preset timeout period, ensuring the system has sufficient time to stabilize.
• Compact Packaging: The MAX704 is available in a variety of packages, including the space-saving 8-pin µMAX, and SO packages, which are suitable for applications where space is at a premium.

The MAX704's combination of features ensures that it is a reliable choice for system designers looking to enhance the operational stability and safety of their microprocessor-based systems. With its precision monitoring capabilities and user-friendly design, the MAX704 from Maxim Integrated is an essential component for any application requiring robust power supply supervision.