Maxim Integrated MAX6863UK29+T Microprocessor Reset Circuit

The MAX6863UK29+T from Maxim Integrated is a high-quality microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in systems that require voltage monitoring. This supervisory circuit is particularly well-suited for portable and battery-powered applications due to its low power consumption and small footprint.

One of the key features of the MAX6863UK29+T is its ability to assert a reset signal whenever the VCC supply voltage falls below a preset threshold, 2.925V for this specific model. The reset output remains asserted for a period of at least 140ms after VCC has risen above the reset threshold, ensuring the system has adequate time to stabilize before the processor starts. This function helps to prevent system errors and malfunctions that can occur if the µP attempts to operate with an inadequate power supply.

The MAX6863UK29+T comes in a compact SOT-23 package, which is ideal for space-constrained applications. It operates over a wide temperature range of -40°C to +125°C, making it suitable for use in various environments, from industrial to automotive applications. The device also features a low supply current of 1.6µA, which is beneficial for preserving battery life in portable devices.

Additional features include a manual reset input that allows for a system reset to be initiated with an external push-button or logic signal. This input is debounced, ensuring that only a clean reset signal is generated. Moreover, the device has an active-low open-drain reset output, which provides flexibility in interfacing with different logic levels and can be wire-ORed with other open-drain or open-collector outputs.

Overall, the MAX6863UK29+T is an excellent choice for designers looking for a reliable and efficient solution to protect their digital systems from improper operation or damage due to undervoltage conditions. Its combination of features, compact size, and ease of use make it a valuable component in any power-sensitive application.