ON Semiconductor CAT809STBI-GT3 Microprocessor Supervisory Circuit

The CAT809STBI-GT3 from ON Semiconductor is a high-performance microprocessor supervisory circuit designed to monitor the power supply and system health in microprocessor and digital systems. It provides a crucial safety net for embedded applications by ensuring that the microprocessor resets to a known state during power-up, power-down, or a brown-out condition.

This device is a precision voltage monitor with a programmable delay timer, offering a threshold voltage of typically 4.38V, which makes it suitable for monitoring 5V power supplies. The CAT809STBI-GT3 asserts a reset signal whenever the V<sub>CC supply voltage falls below its threshold, keeping the reset active for a minimum of 140 ms after V<sub>CC has risen above the reset threshold level. This feature ensures that the system has sufficient time to stabilize before the processor starts or resumes operation.

With its small form factor, the CAT809STBI-GT3 comes in a 3-pin SOT-23 package, which is ideal for space-constrained applications. It operates over a wide temperature range of -40°C to +85°C, providing reliable performance even in harsh environments. The low power consumption of this supervisory circuit makes it an excellent choice for battery-operated devices, where power efficiency is paramount.

Key features of the CAT809STBI-GT3 include:

• Accurate monitoring of 5V power supplies
• Programmable delay timer for reset signal
• Minimum 140 ms reset pulse width
• Low power consumption
• Wide operating temperature range
• Compact SOT-23 package

Applications for the CAT809STBI-GT3 are diverse and include microprocessor systems, computers, controllers, intelligent instruments, portable/battery-powered equipment, and any digital system that requires a reliable reset function. By integrating the CAT809STBI-GT3 into your design, you can enhance system reliability, prevent improper operation during power fluctuations, and ensure a predictable system behavior under various power conditions.

Overall, the CAT809STBI-GT3 from ON Semiconductor is an essential component for designers looking to add robust power monitoring and reset capabilities to their digital systems, ensuring that devices operate safely and effectively across a range of voltages and conditions.