Maxim Integrated MAX6340UK31 Microprocessor Reset Circuit

The Maxim Integrated MAX6340UK31 is a compact, high-precision microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a significant level of system reliability and accuracy required in critical applications. This device ensures that the µP boots up in a known state during power-up, power-down, or brownout conditions.

The MAX6340UK31 comes in a space-saving SOT23 package, making it an ideal choice for space-constrained applications. It offers a preset threshold voltage of 3.08V, tailored to operate with 3.3V power supplies while providing a ±1.5% threshold accuracy over the entire temperature range of -40°C to +125°C. This precision ensures reliable operation even under extreme conditions.

One of the key features of the MAX6340UK31 is its ability to assert a reset signal whenever the VCC supply voltage falls below the factory-set reset threshold. The reset output remains asserted for a minimum reset timeout period of 140ms after VCC rises above the reset threshold, ensuring that the system has sufficient time to stabilize before the processor starts operating.

Moreover, the device boasts a low supply current of only 1.2µA, making it extremely power-efficient and suitable for portable battery-operated devices. The MAX6340UK31 also includes a debounced manual reset input, which allows a reset to be triggered with an external push-button or logic signal, providing additional system control and flexibility.

To cater to different system design needs, the MAX6340UK31 offers an active-low, open-drain reset output. This feature allows the use of an external pull-up resistor of any value, enabling the reset line to be connected to a variety of logic levels depending on the specific requirements of the application.

In summary, the Maxim Integrated MAX6340UK31 is an essential component for system designers looking to enhance the reliability and stability of their microprocessor-based systems. Its precision voltage monitoring, low power consumption, and compact form factor make it an excellent choice for a wide range of applications, from industrial controls to portable consumer electronics.