Maxim Integrated MXD1815XR29+T Microprocessor Reset Circuit

The MXD1815XR29+T is a highly reliable microprocessor (μP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant layer of protection by ensuring that the microprocessor and its associated hardware reset to a known state following a system power failure or brownout condition. This component is essential for maintaining system integrity and preventing data corruption or loss.

Featuring a factory-trimmed reset threshold voltage of 2.925V, the MXD1815XR29+T is specifically tailored to operate in systems with a 3V power supply, although it can support a wide range of supply voltages from 1.0V to 5.0V. The reset output remains asserted for a minimum of 140ms after the supply voltage rises above the reset threshold level, ensuring adequate time for the system to stabilize before the processor begins operation.

The device is available in a compact, 3-pin SOT-23 package, making it suitable for space-constrained applications. Its low supply current of only 1.6μA (typical) makes it an excellent choice for portable and battery-powered equipment where power conservation is crucial. The MXD1815XR29+T is also characterized for operation over a wide temperature range of -40°C to +125°C, ensuring reliable performance in diverse environmental conditions.

Key features of the MXD1815XR29+T include:

• Factory-set V<sub>CC reset threshold voltage of 2.925V
• Low supply current of 1.6μA (typical)
• Guaranteed reset valid to V<sub>CC = 1.0V
• Power supply transient immunity
• 140ms minimum reset pulse width
• Wide operating temperature range (-40°C to +125°C)
• Compact SOT-23 package

Applications that can benefit from the MXD1815XR29+T include portable/battery-powered devices, computers, controllers, intelligent instruments, critical μP and μC power monitoring, and any system where a precise reset threshold is necessary to ensure proper operation and system stability.

With its precision voltage monitoring and low-power consumption, the MXD1815XR29+T from Maxim Integrated is an ideal solution for designers looking to enhance the reliability and performance of their digital systems.