ON Semiconductor ASM811TEUS Microprocessor Reset Circuit

The ON Semiconductor ASM811TEUS is a high-performance microprocessor reset circuit, designed to monitor the power supply voltage in digital systems. It serves as a reliable solution to ensure that microprocessors and other sensitive digital circuits reset properly during a power-on sequence, power-down, or any unexpected power failure. This component is essential for maintaining the integrity of system operations and preventing data corruption.

The ASM811TEUS operates by monitoring the VCC supply voltage. It features a precision voltage sensor that triggers a reset signal when the VCC supply drops below a predetermined threshold. The reset output remains active for a fixed delay time after VCC has risen above the reset voltage threshold, ensuring the system has stabilized before the microprocessor starts its operation. This delay time is factory-set and eliminates the need for any external components, simplifying the design and reducing the overall component count.

Key features of the ASM811TEUS include:

• Low Supply Current: The device is optimized for low power consumption, which is critical for battery-powered applications.
• High Threshold Accuracy: It offers a precise monitoring threshold voltage, ensuring reliable reset operation under varying conditions.
• Manual Reset Input: An additional feature is the manual reset input, which allows for an external trigger to initiate a system reset.
• Reset Timeout Period: The reset signal timeout period is guaranteed to be a minimum of 140ms, providing ample time for the system to stabilize after power-up.
• Operating Temperature Range: The ASM811TEUS is designed to operate over a wide temperature range, making it suitable for industrial applications.
• Compact Packaging: It is available in a small SOT-23 package, which is ideal for space-constrained applications.

With its robust design and ease of integration, the ASM811TEUS from ON Semiconductor is a versatile component that can be implemented across various digital systems requiring reliable voltage monitoring and reset functions. It is especially well-suited for portable devices, computers, controllers, and intelligent instruments where consistent and dependable operation is critical.

Whether you are designing a new system or upgrading an existing one, the ASM811TEUS provides the security and peace of mind that your system will operate as intended, even in the face of power irregularities.