Microchip MIC803-26D3VM3-TR: A Precision 3V Voltage Monitor with Manual Reset Control

In the realm of electronic systems, ensuring reliable and predictable operation during power-up, power-down, and brownout conditions is paramount. The Microchip MIC803-26D3VM3-TR stands out as a dedicated voltage monitoring circuit designed to provide this critical supervisory function. This device combines a precise voltage detector with a manual reset input, offering designers a robust solution for system integrity and user control.

The core function of the MIC803 is to monitor a system's VCC voltage level continuously. The specific part number "26D3VM3" denotes a factory-set reset threshold of 2.63V. When the VCC supply voltage drops below this critical level, the device asserts an active-low reset output (/RST), forcing a microcontroller or processor into a known safe state. This prevents erratic code execution and potential data corruption that can occur when operating at undervoltage conditions. Crucially, the reset signal remains asserted for a fixed delay period (typically 280ms) after VCC has risen back above the threshold, ensuring the power supply and system clock have stabilized before normal operation resumes.

A key differentiator of this IC is its manual reset input pin (/MR). This active-low input allows an external switch, another logic device, or a processor's GPIO to force a system reset on command. This feature is invaluable for debugging, testing, and providing end-users with a straightforward way to reboot a locked or unresponsive system without cycling the main power. The manual reset function is debounced and requires being held low for a minimum duration to be recognized, effectively rejecting noise and accidental glitches.

Housed in a space-saving SOT-23-3 package, the MIC803-26D3VM3-TR is ideal for compact, portable, and battery-powered applications where board real estate is at a premium. Its low supply current makes it particularly suitable for power-sensitive designs. The device's high accuracy and robust performance make it a trusted component in a wide array of applications, including industrial controls, automotive systems, telecommunications hardware, and consumer electronics.

ICGOOODFIND: The Microchip MIC803-26D3VM3-TR is an excellent choice for designers seeking a simple, reliable, and cost-effective voltage monitoring solution. Its integration of a precise 3V supervisor with a manual reset capability in a tiny package provides essential system protection and control, enhancing the overall reliability and user experience of electronic products.

Keywords: Voltage Monitor, Manual Reset, Reset Supervisor, Power Management, Brownout Protection.