Maxim Integrated MAX817LCUA+T Microprocessor Supervisory Circuit

The MAX817LCUA+T from Maxim Integrated is a highly reliable 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 with 5V-powered circuits.

This supervisory circuit ensures that the µP is reset to a known state during power-up, power-down, or brown-out conditions. The reset output is guaranteed to remain in the active state for a minimum of 140ms after VCC has risen above the reset voltage threshold. This feature gives the power supply and µP enough time to stabilize before the processor can execute any code.

Featuring a 4.65V threshold voltage, the MAX817LCUA+T is well-suited for use with standard 5V power supplies. It also offers a debounced manual reset input, allowing for a simple, user-initiated reset. This can be particularly useful during system development and debugging, as well as for providing a manual reset option for end-users.

The device comes in an 8-pin µMAX package, which is a compact and space-saving option, making it ideal for use in systems where board space is at a premium. The MAX817LCUA+T is also available in tape and reel form, denoted by the '+T' suffix, which facilitates automated assembly processes, thus reducing manufacturing costs and time.

Key features of the MAX817LCUA+T include:

• Power supply monitoring for 5V systems
• Precision monitoring of 4.65V power-supply voltages
• 140ms min power-on reset pulse width
• Debounced manual reset input
• Active-high and active-low reset outputs
• Low supply current of 15µA (typical)
• Compact 8-pin µMAX package

Applications for the MAX817LCUA+T range from computers and controllers to intelligent instruments and critical µP power monitoring. Its robust feature set ensures that it is an excellent choice for managing system integrity and protecting against power-related errors in a wide array of electronic products.