Maxim Integrated MAX6423US23+T Microprocessor Reset Circuit

The MAX6423US23+T is a highly reliable microprocessor (μP) supervisory circuit designed by Maxim Integrated 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 component is particularly suitable for portable and space-constrained applications due to its small size and low power consumption.

Encased in a compact SOT-143 package, the MAX6423US23+T operates over a wide voltage range and is specifically designed to maintain system integrity through monitoring. It asserts a reset signal whenever the VCC supply voltage falls below a preset threshold, 2.32V for this specific model. The reset signal continues to be asserted for a minimum of 140ms after VCC has risen above the reset threshold, ensuring that the system has adequate time to stabilize before the processor restarts.

Key features of the MAX6423US23+T include:

• Factory-trimmed reset threshold voltage of 2.32V suitable for 2.5V powered circuits.
• Low supply current of 1.2μA (typical), which is ideal for battery-powered equipment.
• Guaranteed reset valid to VCC = 1V, which ensures reliable operation during low voltage conditions.
• Immune to short VCC transients, providing consistent performance under fluctuating power conditions.
• Push-pull active-low RESET output, which negates the need for external pull-up resistors and reduces component count.

This device is highly versatile, as it is designed for a broad array of applications, including computers, controllers, intelligent instruments, portable/battery-powered products, and critical μP power monitoring. With its built-in hysteresis to prevent chattering, the MAX6423US23+T is engineered to provide a clear reset signal, thus enhancing the reliability of the system it is safeguarding.

The MAX6423US23+T is part of Maxim Integrated's commitment to delivering robust and compact solutions for power management challenges. Its precision, low power consumption, and small footprint make it an excellent choice for designers looking to enhance system reliability without compromising on space or power efficiency.