ON Semiconductor MAX809STR Microprocessor Reset Monitor

The ON Semiconductor MAX809STR is a compact, highly efficient microprocessor (μP) supervisory circuit designed to monitor power supplies in digital systems. It provides a crucial function by ensuring that the microprocessor is reset to a known state during power-up, power-down, or brown-out conditions. The MAX809STR is an essential component for maintaining system reliability and preventing software execution errors.

Key Features

• Precision Monitoring: It features a precision voltage monitor that keeps a close watch on the system's power supply voltage levels.
• Reset Output: Upon detecting an out-of-tolerance condition, the device generates a reset signal, which remains active for a minimum of 140ms after the supply voltage exceeds the reset threshold level. This ensures that the system has sufficient time to stabilize.
• Low Power Consumption: Designed for low power consumption, the MAX809STR is suitable for battery-operated applications.
• Versatile Voltage Thresholds: The device is available with several different factory-programmed threshold levels to accommodate various system requirements.
• Manual Reset Capability: It includes a manual reset input that allows for a reset to be triggered with an external switch or logic signal.
• Compact SOT-23 Packaging: The device comes in a small SOT-23 package, making it ideal for space-constrained applications.

Applications

The MAX809STR is versatile and can be used in a wide range of applications. It is particularly well-suited for portable devices, computers, controllers, and intelligent instruments where reliable system operation is critical. Its ability to provide a clean reset signal makes it an invaluable component in systems that require high uptime and consistent performance.

Conclusion

ON Semiconductor's MAX809STR microprocessor reset monitor is a robust solution for managing system power-on reset functions. Its precision voltage monitoring, low power consumption, and compact form factor make it a top choice for designers looking to enhance the reliability and performance of their digital systems. Whether used in consumer electronics, automotive systems, or industrial controls, the MAX809STR provides the necessary protection against unpredictable power supply conditions, ensuring that digital systems operate as intended.