Maxim Integrated MAX6389XS29D2 Microprocessor Reset Circuit

The MAX6389XS29D2 is a compact, high-precision 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 2.9V powered circuits.

This supervisory circuit is specifically designed to maintain system integrity by monitoring the power supply voltage. In the event that the supply voltage drops below a preset threshold, the MAX6389XS29D2 asserts a reset signal to reset the microprocessor, effectively safeguarding the system from unpredictable behavior due to low voltage conditions. The reset output remains asserted for a minimum timeout period after the supply voltage rises above the reset threshold, ensuring the system has adequate time to stabilize.

The MAX6389XS29D2 features an active-low, push-pull reset output. This configuration eliminates the need for an external pull-up resistor and allows for a direct connection to the reset input of the microprocessor. The device's reset threshold is factory-set to 2.9V, making it suitable for applications operating around this voltage level.

With its small size, the MAX6389XS29D2 is ideal for space-constrained applications. It is available in a compact 4-pin SC70 package, which minimizes the footprint on the printed circuit board. The device operates over a wide temperature range of -40°C to +125°C, allowing it to perform reliably in various environmental conditions.

Key features of the MAX6389XS29D2 include:

• Factory-set reset threshold voltage of 2.9V
• Minimum 140ms reset timeout period
• Low supply current of 1µA (typical)
• Guaranteed reset valid to VCC = 1V
• Active-low, push-pull reset output
• Compact 4-pin SC70 package
• Wide operating temperature range

Overall, the MAX6389XS29D2 is a robust and reliable solution for power monitoring in microprocessor-based systems, ensuring that digital electronics maintain operational integrity through power disturbances.