ON Semiconductor CAT1021WI-25-T3 Supervisory Circuit

The ON Semiconductor CAT1021WI-25-T3 is a robust and highly reliable supervisory circuit designed to monitor power supplies in digital systems. Its primary function is to safeguard your microprocessors, microcontrollers, and other digital systems by providing a reset signal during power-up, power-down, and brown-out conditions. This ensures that the system starts in a known state every time.

Featuring a precision temperature-compensated voltage reference and comparator circuit, the CAT1021WI-25-T3 monitors the status of the power supply and maintains system integrity. It comes with a fixed threshold voltage of 2.5V, which is ideal for 3V systems, and it triggers a reset signal if the supply voltage drops below this threshold. The reset output remains active for a minimum of 140ms after Vcc has risen above the reset threshold level, providing ample time for the system to stabilize.

This supervisory circuit is available in a small SOT-23 package, making it suitable for space-constrained applications. Its low power consumption is an added advantage for portable and battery-powered devices, ensuring minimal impact on the overall power budget of the system. Additionally, the CAT1021WI-25-T3 features a debounced manual reset input, which allows for a manual reset of the system whenever required.

Key features of the CAT1021WI-25-T3 include:

• Precision Monitoring of 3V Power Supplies
• Active Low Reset Output
• 140ms (min) Reset Pulse Width
• Manual Reset Capability
• Low Supply Current - 20μA (typ)
• Temperature-Compensated Voltage Threshold
• Available in SOT-23 Package

With its high accuracy and reliability, the CAT1021WI-25-T3 is a perfect choice for critical applications that require consistent monitoring and control of the supply voltage. Whether you're designing consumer electronics, automotive systems, or industrial controls, this supervisory circuit from ON Semiconductor provides an extra layer of protection against unpredictable power conditions, ensuring that your digital systems operate smoothly and reliably.