Maxim Integrated MAX6418UK33+T Microprocessor Reset Circuit

The Maxim Integrated MAX6418UK33+T is a highly reliable and compact microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a crucial function by ensuring that the µP boots up in a predictable state, even in cases of an unstable or failing power supply. This component is essential for maintaining system integrity and preventing data corruption during power-up, power-down, and brown-out conditions.

The MAX6418UK33+T is specifically engineered to monitor 3.3V power supplies, which is common in many digital systems. It features a factory-trimmed reset threshold voltage that guarantees accurate monitoring of the VCC. This device asserts a reset signal when the VCC supply voltage falls below the preset threshold, keeping it asserted for a minimum timeout period after VCC has risen above the reset threshold to ensure system stability.

This supervisory circuit is available in a small SOT-23 package, making it ideal for space-constrained applications. The MAX6418UK33+T variant comes in a 5-pin configuration and includes active-low, open-drain RESET output. The open-drain output allows for the flexibility to connect to different logic levels and to wire-OR multiple reset lines together.

Key features of the MAX6418UK33+T include:

• Factory-set reset threshold voltage for 3.3V systems.
• Low supply current of 1.5µA (typical), which is beneficial for portable and battery-powered applications.
• Immunity to short VCC transients, ensuring reliable operation under noisy conditions.
• Manual reset capability, providing a way to initiate a system reset externally.
• Extended operating temperature range from -40°C to +125°C, making it suitable for industrial applications.

Applications for the MAX6418UK33+T range from portable devices, computers, controllers, to embedded systems where a precise and reliable system reset is critical. With its tight reset threshold accuracy and low power consumption, the Maxim Integrated MAX6418UK33+T is an excellent choice for designers looking to enhance the robustness and reliability of their digital systems.