The LM809M3X-4.38 is a microprocessor supervisory circuit designed by Texas Instruments to monitor the power supplies in digital systems. This high-precision voltage detector ensures reliable operation of microprocessors and other sensitive electronics by providing a significant function in the system: the reset control. It is essential in situations where a system's power supply may be prone to fluctuations that could cause a processor to operate erratically.

Key Features

• Voltage Threshold: The device features a precise factory-programmed threshold voltage of 4.38V, suitable for monitoring 5V power supplies.
• Reset Timeout: Upon detecting a voltage drop below the threshold, it generates a reset signal that lasts for a minimum of 140ms, ensuring the system has ample time to stabilize during power-up, power-down, and brown-out conditions.
• Low Supply Current: The LM809M3X-4.38 is optimized for low power consumption, drawing a quiescent current of just 20µA (typical), which is ideal for power-sensitive applications.
• Temperature Range: It operates over a wide temperature range, making it suitable for various industrial and consumer applications.
• Package: The device comes in a small SOT-23 package, allowing for compact PCB design and is well-suited for space-constrained applications.
• Output Type: The reset output is active-low and is designed to interface directly with the reset pin of most microprocessors, providing a clear and assertive signal to initiate a system reset.

Applications

The LM809M3X-4.38 is versatile and can be used across a broad range of applications, including:

• Microprocessor, microcontroller, and DSP systems
• Portable and battery-powered equipment
• Intelligent instruments
• Industrial controllers
• Embedded systems

Quality and Reliability

Texas Instruments is known for its commitment to quality and reliability, and the LM809M3X-4.38 is no exception. This product is built to meet the high standards expected from TI, ensuring dependable performance for critical system monitoring functions.