The AIC809-26CUTR is a 3-pin voltage supervisor or reset IC. It is designed to monitor the voltage level of a power supply and assert a reset signal when the voltage drops below a specified threshold. This ensures that the system starts up correctly and prevents malfunctions due to undervoltage conditions. The '26' in the part number indicates a threshold voltage of 2.6V.

Applications

• Microprocessor/Microcontroller Systems: Resets the microprocessor or microcontroller during power-up, power-down, and brownout conditions.
• Memory Systems: Protects memory data by asserting a reset signal when the supply voltage is too low for reliable memory operation.
• Embedded Systems: Monitors the power supply voltage to ensure stable operation of embedded systems.
• Industrial Control Systems: Provides reliable reset functionality in industrial environments where power fluctuations are common.
• Automotive Electronics: Monitors the battery voltage to prevent damage to electronic components during low voltage conditions.

Features

• Precision Voltage Monitoring: Accurately monitors the supply voltage with a specified threshold. In this case, the threshold is 2.6V.
• Active-Low Reset Output: The reset output is active low, meaning it asserts a low signal when the voltage is below the threshold.
• Guaranteed Reset Assertion Down to 1V: Ensures that the reset signal is asserted even when the supply voltage drops to 1V.
• Low Supply Current: Consumes minimal current, making it suitable for battery-powered applications.
• Small Package Size: Available in a small SOT-23 package, saving board space.
• No External Components Required: Requires no external components for basic operation, simplifying circuit design.
• Temperature Range: Typically specified for industrial temperature ranges.

Benefits

• Prevents System Malfunctions: Ensures that the system starts up correctly and prevents data corruption due to undervoltage conditions.
• Improves System Reliability: Provides reliable reset functionality, improving the overall reliability of the system.
• Simplifies Circuit Design: Requires no external components for basic operation, simplifying circuit design and reducing board space.
• Reduces System Cost: Low component count and small package size reduces the overall system cost.
• Extends Battery Life: Low supply current maximizes battery life in portable devices.

Additional Details

The AIC809-26CUTR operates by continuously monitoring the input voltage. When the voltage drops below the threshold voltage (2.6V), the reset output is asserted low. The reset output remains low until the input voltage rises above the threshold voltage plus a small hysteresis. The hysteresis prevents oscillations on the reset output when the input voltage is near the threshold. The 'CUTR' suffix typically indicates a specific package and tape & reel packaging for automated assembly.

It is designed to be a simple and cost-effective solution for voltage monitoring and reset generation in a wide range of applications. Because of its simplicity and robustness, it is a popular choice for ensuring proper system operation in embedded systems and other electronic devices.