Maxim Integrated MAX791ESE+ Microprocessor Supervisory Circuit

The Maxim Integrated MAX791ESE+ is a precision microprocessor (µP) supervisory circuit designed 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 systems that require battery backup and power-fail warning.

This supervisory circuit ensures that the µP is reset to a known state upon power-up by providing a reset signal to the µP during power-up, power-down, and brownout conditions. The reset output remains operational with VCC as low as 1V. The MAX791ESE+ features a 200ms reset timeout period, ensuring sufficient time for the µP to stabilize during power-up or after a voltage disturbance.

The device comes in a 16-pin narrow SO package and operates over a wide temperature range of -40°C to +85°C, making it suitable for various industrial and high-reliability applications. Its key features include a 4.65V threshold for power-fail warning, battery backup switching, and a watchdog timer that safeguards against system errors.

Additional features of the MAX791ESE+ include:

• Adjustable power-fail input threshold
• Manual reset capability
• Active-low reset output
• Backup battery life extender in chip-enable gating
• Low supply current of 40µA (typical)

This supervisory circuit is ideal for use in microprocessor systems, computers, controllers, and intelligent instruments where it can help to improve system reliability and reduce the risk of erroneous operation due to unstable power conditions.

The MAX791ESE+ is part of Maxim Integrated's commitment to providing robust and efficient solutions for power management and monitoring. With its ease of integration and comprehensive feature set, the MAX791ESE+ is a prudent choice for designers looking to enhance their system's performance and stability.

For detailed specifications and application guidance, refer to the Maxim Integrated MAX791ESE+ datasheet and application notes.