Maxim Integrated MXD1813UR46+T Microprocessor Reset Circuit

The MXD1813UR46+T from Maxim Integrated is a highly efficient microprocessor (µP) supervisory circuit designed to monitor the power supplies in µP and digital systems. It provides a significant level of protection for your electronics by ensuring that the system's microprocessor is reset to a known state during power-up, power-down, or brown-out conditions. This component is particularly ideal for portable, battery-powered equipment due to its low power consumption and compact SOT-23 packaging.

This supervisory circuit asserts a reset signal whenever the V<sub>CC supply voltage falls below its preset threshold of 4.63V (typical). The reset signal remains asserted for a minimum reset timeout period of 140ms (typical) after V<sub>CC has risen above the reset threshold. This ensures that the system has ample time to stabilize before the processor starts or resumes operation. The MXD1813UR46+T also features a manual reset input that allows the user to initiate a system reset with an external pushbutton or logic signal.

Key features of the MXD1813UR46+T include:

• Factory-trimmed V<sub>CC reset threshold voltage of 4.63V
• Minimum reset timeout period of 140ms
• Low supply current of 1.6µA (typical), making it suitable for battery-operated applications
• Immunity to short V<sub>CC transients
• Manual reset capability
• Compact 3-pin SOT-23 package
• Operating temperature range from -40°C to +85°C

As a versatile component, the MXD1813UR46+T is designed to support a wide range of applications, including computers, controllers, intelligent instruments, critical µP and µC power monitoring, and portable/battery-powered equipment. The integration of this reset circuit helps to enhance system reliability and prevent erroneous operations due to unstable power supplies.

Maxim Integrated's commitment to quality ensures that the MXD1813UR46+T meets the stringent requirements of modern electronic systems, providing both a practical and reliable solution for system power monitoring and reset functions.