The STM809M from STMicroelectronics is a highly reliable, precision microprocessor reset circuit device that plays a crucial role in managing system integrity during power-up, power-down, and brown-out conditions. This compact component is designed to monitor the supply voltage of microprocessor (μP) systems, ensuring that the μP and its peripherals are reset to a known state during power failures or whenever the voltage drops below a designated threshold.

Key Features

• Precision Monitoring: The STM809M offers precise monitoring of the 3.3V power supply with a tight 3.08V threshold, ensuring accurate reset signaling.
• Low Power Consumption: With its low power consumption, this device is an excellent choice for power-sensitive applications.
• Reset Time Delay: It features an active-low RESET output, with a significant delay of 140ms (minimum), providing ample time for the system to stabilize before coming out of reset.
• High Threshold Accuracy: The reset threshold accuracy is maintained over a wide temperature range of -40°C to +85°C, suitable for various operating environments.
• Open Drain Reset Output: The open-drain output allows for wired-OR connections, adding flexibility in reset circuitry design.
• Compact Package: The device comes in a compact SOT-23 package, making it ideal for space-constrained applications.

Applications

The STM809M is widely used in microprocessor systems where reliable reset functionality is essential. It is suitable for applications such as:

• Computers and Servers
• Embedded Systems
• Portable/Battery-Powered Devices
• Intelligent Instruments
• Industrial Controllers

Conclusion

In summary, the STM809M is a vital component for ensuring system stability and reliability. Its precise voltage monitoring and reset capabilities, along with its low power consumption and small form factor, make it an indispensable tool for designers looking to enhance the robustness of their microprocessor systems. STMicroelectronics' commitment to quality and performance is evident in this device, making it a go-to solution for a wide range of applications.