ON Semiconductor ASM809LEUR Microprocessor Reset Circuit

The ASM809LEUR from ON Semiconductor is a highly precise microprocessor (µP) supervisory circuit designed to monitor the power supply and system health of microprocessor systems. This compact and efficient component plays a crucial role in ensuring that systems operate reliably by providing a reset signal to the µP during power-up, power-down, and brown-out conditions. The ASM809LEUR helps to prevent system errors and data corruption that can occur due to unstable power supply or unexpected system failures.

One of the key features of the ASM809LEUR is its ability to monitor the system voltage with high accuracy. When the monitored voltage drops below the minimum V_CC threshold, the device asserts a reset signal that remains active for a minimum of 140ms after V_CC has risen above the reset threshold level. This ensures that the system has sufficient time to stabilize before the processor begins operation, thereby enhancing system reliability.

The ASM809LEUR is designed with a low power consumption profile, making it an ideal choice for power-sensitive applications. With a low supply current of only 17µA, it contributes to the overall energy efficiency of the system it is integrated into. This feature is particularly important for battery-operated devices, where power conservation is a priority.

Featuring an open-drain RESET output, the ASM809LEUR can interface directly with many microprocessors and can be wire-ORed with other open-drain or active-low signals. The device is available in a compact SOT-23 package, allowing for easy integration into space-constrained applications without compromising on functionality.

The versatility of the ASM809LEUR makes it an excellent choice for a wide range of applications, including computers, controllers, intelligent instruments, portable/battery-powered products, and other embedded systems. Its robust design ensures that it can provide reliable reset signals across its operating temperature range of -40°C to +85°C, making it suitable for use in both commercial and industrial environments.

Overall, the ASM809LEUR from ON Semiconductor is a vital component for maintaining system integrity and preventing data loss in various electronic systems. Its precise voltage monitoring capabilities, low power consumption, and small form factor make it a valuable addition to any microprocessor-based application.