ON Semiconductor ASM811REUSF Voltage Supervisor IC

The ON Semiconductor ASM811REUSF is a microprocessor (µP) supervisory circuit that monitors power supplies in digital systems. It provides a significant level of system reliability through its ability to reset microprocessors during power-up, power-down, and brown-out conditions. With a compact SOT-143 package, the ASM811REUSF is designed to be space-efficient, making it ideal for use in space-constrained applications.

This voltage supervisor IC ensures that the microprocessor is reset to a known state during power failures or anomalies. It accomplishes this by monitoring the VCC and asserting a reset signal whenever VCC drops below the minimum VTRIP point. The reset signal remains asserted for a period after VCC rises above the reset threshold, ensuring the system has stabilized before the processor begins operation. This period, known as the reset timeout period, is typically 140 ms.

The ASM811REUSF has several key features that make it an essential component for system stability:

• Precision Monitoring: It features a precision voltage monitor with a factory-trimmed reset threshold for 4.65V, which is suitable for 5V-powered microprocessors.
• Low Power Consumption: The device is optimized for low power consumption, making it suitable for battery-operated systems.
• Manual Reset Input: A manual reset input is provided, allowing a pushbutton or an external signal to initiate system resets.
• High Reset Output: The reset output is active high, with an open-drain output stage, allowing the option to wire-OR the reset signal with other supervisory circuits.
• Temperature Range: It operates over a wide temperature range of -40°C to +85°C, providing reliable performance across diverse environmental conditions.

Whether used in microprocessor-based office machines, computers, controllers, or other digital systems, the ASM811REUSF is a robust solution for enhancing system reliability. Its integration into a system design can prevent the erratic operation caused by power instabilities and ensure that digital systems start in a known state, which is critical for maintaining data integrity and system functionality.

ON Semiconductor's commitment to quality ensures that the ASM811REUSF meets the stringent requirements of modern electronic systems, providing designers with a reliable and easy-to-implement solution for power monitoring and microprocessor supervision.