ON Semiconductor MC33164P-3G Microprocessor Supervisory Circuit

The ON Semiconductor MC33164P-3G is a precision microprocessor supervisory circuit, designed to monitor the power supplies in microprocessor and digital systems. It provides a high degree of protection against the unpredictable nature of power supply fluctuations, which can lead to erroneous operation in electronic devices. This component is a crucial part of ensuring system reliability and stability in a wide range of applications.

With its compact DIP-8 (Dual In-line Package) form factor, the MC33164P-3G integrates seamlessly into various circuit designs, offering a space-saving solution for power management tasks. Its primary function is to provide a reset signal to the microprocessor during power-up, power-down, and brown-out conditions, ensuring that the processor starts up in a known state every time.

The device features a precise factory-trimmed threshold voltage which detects out-of-tolerance power supply conditions. When the input voltage to the supervisory circuit drops below the threshold, the reset output is asserted, which holds the microprocessor in a reset state for a minimum of 140 ms after the supply voltage exceeds the threshold level again. This delay ensures that the power supply has stabilized before allowing the processor to resume operation.

The MC33164P-3G also includes a manual reset input that allows for an external trigger to initiate a system reset. This can be useful for system maintenance or to recover from software errors. The manual reset is active-low, meaning that it is triggered by a low logic level input.

ON Semiconductor has designed the MC33164P-3G with low power consumption in mind, making it suitable for portable and battery-powered applications. The device operates over a wide voltage range and temperature range, ensuring reliable performance in diverse operating conditions.

In summary, the ON Semiconductor MC33164P-3G is a versatile and reliable solution for power supply monitoring in microprocessor systems. Its precision voltage monitoring, reset delay timing, and manual reset feature make it a valuable component for any design requiring robust power management.