Maxim Integrated MAX814TESA Microprocessor Supervisory Circuit

The Maxim Integrated MAX814TESA is a compact, highly precise microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. It provides a significant level of system reliability and accuracy required in critical applications, ensuring that the µP is reset to a known state during power-up, power-down, or brown-out conditions.

This supervisory circuit comes in a space-saving 8-pin SOIC package, making it ideal for use in systems where board space is at a premium. It is particularly well-suited for battery-powered equipment, thanks to its low power consumption and wide operating voltage range.

One of the key features of the MAX814TESA is its ability to assert a reset signal whenever the VCC supply voltage declines below a preset threshold, maintaining it until VCC has returned to an acceptable level and a minimum of 140ms has passed. This reset timeout ensures that the system has ample time to stabilize before the processor starts its operation. Additionally, the device includes a manual reset input that allows for a reset to be triggered with an external pushbutton or logic signal.

The MAX814TESA boasts an impressive accuracy of ±1.5% reset threshold over temperature, which is essential for reliable operation under varying conditions. It also features an active-low reset output, which is guaranteed to be in the correct state for VCC down to 1V, making it highly reliable across a range of input conditions.

Other notable features of the MAX814TESA include its immunity to short VCC transients, ensuring that the device will not generate false resets. The circuit also has a low supply current of 17µA (typical), which is beneficial for power-sensitive applications.

In summary, the Maxim Integrated MAX814TESA is a robust and reliable solution for system monitoring, offering precision, low power consumption, and a small form factor. It is an excellent choice for designers looking to enhance the operational stability of their digital systems.