ON Semiconductor MC34164P-5RA Microprocessor Supervisory Circuit

The ON Semiconductor MC34164P-5RA is a precision microprocessor supervisory circuit designed to monitor the power supplies in digital systems. It provides a crucial function by ensuring that the microprocessor and other sensitive digital systems operate within the safe voltage supply limits, thus protecting them from unpredictable system behavior or damage due to power fluctuations.

This particular model, the MC34164P-5RA, is a highly reliable component that offers a threshold voltage of 4.55V, which makes it suitable for 5V-powered systems. It is designed to trigger a reset signal to the microprocessor during power-up, power-down, and brown-out conditions. The reset signal remains asserted until the system voltage has stabilized above the reset threshold level for a specified period, ensuring proper system reset and initialization.

Key features of the MC34164P-5RA include:

• Precision Voltage Monitor: It has a tight tolerance for the threshold voltage, ensuring accurate monitoring of the power supply.
• Low Supply Current: The device consumes a minimal amount of current, making it ideal for power-sensitive applications.
• Guaranteed Reset Output: The reset output is guaranteed valid down to V<sub>CC = 1.0V, which is essential for low-voltage operations.
• Operating Temperature Range: It operates over a wide temperature range, making it suitable for various environmental conditions.
• Versatility: It is available in a TO-92 package, which is a widely used and easily mountable package type.

The MC34164P-5RA is a critical component for systems that require a high degree of reliability and stability. It is commonly used in microprocessor-based systems, computers, controllers, and intelligent instruments. With its precision voltage monitoring and low power consumption, the MC34164P-5RA from ON Semiconductor is an excellent choice for designers looking to enhance the operational safety of their digital systems.