MAX6326UR25: Ultra-Low-Power SC70/SOT Microprocessor Reset Circuits

The MAX6326UR25 is a compact, high-precision microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant function by ensuring that the µP and its peripherals are reset properly during power-up, power-down, or brown-out conditions. This component is particularly well-suited for battery-powered applications due to its ultra-low power consumption and small footprint.

With a factory-set reset threshold voltage of 2.5V, the MAX6326UR25 is optimized to work with 2.5V-powered systems. Its ability to assert a reset signal until the system voltage reaches a stable operating level and then maintain it for a minimum of 140ms after Vcc rises above the reset threshold ensures a reliable startup. This reset delay provides ample time for the system’s power supply and processor to stabilize before operation commences.

The device is available in a tiny SC70 or SOT package, making it an excellent choice for space-constrained applications. Its low supply current of only 1µA (typical) is especially beneficial for portable equipment, where extending battery life is of paramount importance. Additionally, the MAX6326UR25 offers a manual reset feature, allowing a reset to be triggered with an external switch or software command, providing designers with flexibility and control over the reset logic.

Key features of the MAX6326UR25 include:

• Factory-set reset threshold voltage of 2.5V
• Ultra-low 1µA supply current
• Minimum 140ms reset timeout period
• Manual reset input for additional system control
• Guaranteed valid reset output down to Vcc = 1.0V
• Immunity to short Vcc transients
• Available in SC70 or SOT23 packages

Overall, the MAX6326UR25 from Maxim Integrated is an essential component for ensuring the reliability and stability of microprocessor systems, particularly in portable and space-sensitive applications. Its low power consumption, precision monitoring capabilities, and compact form factor make it an ideal choice for designers looking to enhance system integrity with minimal impact on battery life and board space.