Maxim Integrated MAX6412UK46+T Microprocessor Reset Circuit

The MAX6412UK46+T from Maxim Integrated is a compact, high-precision microprocessor (μP) supervisory circuit designed to monitor power supplies in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in systems with a 4.6V supply voltage threshold.

This device is particularly well-suited for portable and battery-powered applications, thanks to its low power consumption and small footprint. The MAX6412UK46+T is available in a space-saving 5-pin SOT23 package, making it ideal for space-constrained applications.

The primary function of the MAX6412UK46+T is to assert a reset signal whenever the VCC supply voltage falls below its preset threshold of 4.6V. The reset output remains asserted for a minimum timeout period after VCC has risen above the reset threshold, ensuring that the microprocessor has adequate time to initialize and stabilize. The reset timeout period provided by the MAX6412UK46+T is internally set to a fixed delay, typically 280ms, which helps to prevent spurious resets due to transient dips in the power supply.

Key features of the MAX6412UK46+T include:

• Immunity to short VCC transients
• Low supply current of 1.5μA, which is crucial for battery-powered applications
• Guaranteed reset valid to VCC = 1V, ensuring reliable operation during low voltage conditions
• No external components required, simplifying design and reducing BOM costs
• High threshold accuracy of ±1.5%
• Operating temperature range from -40°C to +125°C, suitable for industrial applications

The MAX6412UK46+T also features a debounced manual reset input, which allows for a system reset to be triggered with an external pushbutton or logic signal. This additional functionality provides designers with a convenient way to manually reset their system without cycling the power supply.

Overall, the MAX6412UK46+T is a reliable and efficient solution for system monitoring, offering the robustness and precision expected from Maxim Integrated products. It is an excellent choice for applications requiring a high level of system stability and minimal power consumption.