Maxim Integrated MAX6340UK40+ Microprocessor Reset Circuit

The MAX6340UK40+ is a compact, highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant layer of protection to ensure stable operation by asserting a reset signal whenever the VCC supply voltage falls below a preset threshold. This precision device is tailored for systems that require a stringent power-on reset and power-fail warning.

Engineered for versatility, the MAX6340UK40+ operates over a wide voltage range and is particularly suited for portable and battery-powered equipment. Its low supply current of only 1.2µA (typical) makes it an ideal choice for power-conscious designs, ensuring minimal impact on the overall energy consumption of the system.

The reset output of the MAX6340UK40+ is available in both active-low and open-drain configurations, providing flexibility in interfacing with different logic levels and allowing for the connection of multiple devices in a wired-OR configuration. The reset signal is guaranteed to remain asserted for a minimum reset timeout period of 140ms after VCC has risen above the reset threshold level, ensuring proper system reset during power-up, power-down, and brownout conditions.

The device comes in a compact SOT-23 package, which is highly beneficial for space-constrained applications. Its operating temperature range of -40°C to +85°C enables reliable performance in a variety of environments and application conditions.

Key features of the MAX6340UK40+ include:

• Precision factory-set VCC reset thresholds
• Low 1.2µA supply current
• 140ms (min) reset timeout period
• Immune to short VCC transients
• Compact SOT-23 packaging
• Wide operating temperature range

With its robust design and precision performance, the MAX6340UK40+ is an excellent choice for managing power supply stability in critical systems where reliability cannot be compromised.