Maxim Integrated MAX6328UR23 Microprocessor Reset Circuit

The MAX6328UR23 from Maxim Integrated is a highly precise, low-power microprocessor (µP) supervisory circuit designed to monitor power supplies and microprocessor activity in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used with 2.3V-powered circuits.

This device performs a single function: it asserts a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. The reset output is available in either an active-low push-pull or an active-low open-drain configuration. This particular model, the MAX6328UR23, comes with an active-low push-pull reset output.

The MAX6328 family features a variety of factory-set VCC reset thresholds, making it suitable for monitoring 3V, 3.3V, and 5V power supplies. The MAX6328UR23 is specifically tailored for 2.3V applications, ensuring that devices operating at this voltage are properly monitored and protected from undesired operational states due to dips in power supply.

Key features of the MAX6328UR23 include:

• High Accuracy Preset VCC Reset Threshold of 2.3V
• Low 1.2µA Supply Current Makes it Ideal for Portable Equipment
• Minimum 140ms Reset Pulse Width
• Immune to Short VCC Transients
• Push-Pull RESET Output
• Temperature Range: -40°C to +85°C
• No External Components Required

The MAX6328UR23 is typically packaged in a compact, 3-pin SOT23, which is suitable for space-constrained applications. Its small size and high level of integration make it an excellent choice for portable devices, including PDAs, mobile phones, and other battery-operated electronics.

In summary, the Maxim Integrated MAX6328UR23 offers a simple and efficient solution for system monitoring, providing a reliable safeguard against low voltage conditions and ensuring stable operation of microprocessor-based systems.