Maxim Integrated MAX6328XR28+ Microprocessor Reset Circuit

The MAX6328XR28+ is a precision, low-power microprocessor (µP) reset circuit device from Maxim Integrated designed to monitor power supplies in digital systems. It provides a significant level of system reliability and accuracy required in critical electronic applications. This device is particularly well-suited for portable, battery-powered equipment due to its low power consumption and compact form factor.

This reset circuit operates by monitoring the system voltage and asserting a reset if the supply voltage drops below a predetermined threshold, ensuring that the µP and other system components reset cleanly during power-up, power-down, or brown-out conditions. The reset output remains asserted for a period after the supply voltage exceeds the reset threshold, providing ample time for the system to stabilize.

The MAX6328XR28+ features a factory-set reset threshold voltage of 2.8V, which is ideal for 3V systems and applications. The device comes in a small, 3-pin SC70 package, which is highly beneficial for space-constrained designs. In addition to its compact size, the MAX6328XR28+ boasts an extremely low quiescent current of only 1µA, making it an energy-efficient choice for battery-operated devices.

Key features of the MAX6328XR28+ include:

• Factory-trimmed V<sub>CC reset threshold voltage: 2.8V
• Low supply current of 1µA (typical)
• Guaranteed reset valid to V<sub>CC = 1V
• ±2% reset threshold accuracy over temperature
• Immune to short V<sub>CC transients
• Push-pull RESET output
• Operating temperature range: -40°C to +125°C
• SC70 packaging for space-saving applications

The device's push-pull RESET output ensures a quick and decisive reset signal without the need for external components, simplifying the design and reducing the overall bill of materials. The MAX6328XR28+ is designed to meet the stringent requirements of highly reliable systems, such as telecommunications equipment, computers, controllers, and intelligent instruments.

Overall, the Maxim Integrated MAX6328XR28+ provides a robust and reliable solution for system reset management, with its precision voltage monitoring and low-power operation ensuring optimal performance in a variety of electronic systems.