Maxim Integrated MAX6468XS46D3-T Microprocessor Reset Circuit

The MAX6468XS46D3-T is a compact, highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used with +3.3V-powered circuits.

This device performs a single function: it asserts a reset signal whenever the VCC supply voltage declines below a preset threshold, maintaining it asserted for at least 140ms after VCC has risen above the reset threshold. The reset output is available in either an active-low push-pull or active-low open-drain configuration. The MAX6468XS46D3-T features an active-low manual reset input, which allows the user to trigger a reset with an external switch or logic signal.

The reset voltage threshold for the MAX6468XS46D3-T is factory-set to 4.63V, which is suitable for monitoring 5V power supplies. Its low supply current of 1.5µA (typical) makes it an energy-efficient choice for battery-powered applications. The device is designed to operate over a wide temperature range of -40°C to +125°C, ensuring functionality across various environments and applications.

Encased in a small, 4-pin SOT143 package, the MAX6468XS46D3-T is ideal for space-constrained applications. It is also available in a variety of standard reset threshold voltages, which allows flexibility in choosing the appropriate device for specific system requirements.

Key features of the MAX6468XS46D3-T include:

• Factory-set reset threshold voltage: 4.63V
• Minimum reset pulse duration: 140ms
• Low supply current: 1.5µA (typical)
• Wide operating temperature range: -40°C to +125°C
• Manual reset input
• Compact SOT143 package

This µP supervisory circuit is ideal for use in systems that require a reliable reset function to ensure proper operation upon power-up or during undesirable voltage conditions. Whether in computers, controllers, or portable devices, the MAX6468XS46D3-T provides the necessary protection against power supply inconsistencies, thus safeguarding the integrity of the system it is incorporated into.