Supply original LM809M3-2.63/NOPB, PMIC - Supervisors, by Texas Instruments

The LM809M3-2.63/NOPB is a voltage supervisor integrated circuit (IC) manufactured by Texas Instruments. It is designed to monitor power supply voltages and provide a reset signal to microcontrollers and other digital devices when the supply voltage falls below a specified threshold. Here’s a detailed description of its features and specifications:

Key Features:

1. Voltage Monitoring: The LM809 monitors the supply voltage and ensures that the voltage remains within a specified range. If the voltage drops below the preset threshold, the device generates a reset signal.

2. Reset Threshold: The LM809M3-2.63 variant has a reset threshold of 2.63V. This means it will assert a reset signal when the supply voltage falls below this level, making it suitable for low-voltage applications.

3. Active Low Reset Output: The reset output is active low, meaning that it goes low (0V) when a reset condition is detected. This output can be connected directly to the reset pin of a microcontroller.

4. Reset Timeout: The device features a built-in timeout period after the voltage returns to normal levels, ensuring that the reset signal remains asserted for a sufficient duration to allow the system to stabilize.

5. Low Supply Current: The LM809 is designed to operate with low supply current, making it energy-efficient and suitable for battery-powered applications.

6. Temperature Range: The device operates over a wide temperature range, typically from -40°C to +125°C, making it suitable for industrial and automotive applications.

7. Small Package Size: The LM809M3-2.63/NOPB is available in a compact SOT-23 package, which is ideal for space-constrained designs.

8. No External Components Required: The LM809 is designed to work without the need for external components, simplifying the design process and reducing the overall footprint of the circuit.

Applications:

• Microcontroller reset circuits
• Power supply monitoring
• Battery-operated devices
• Automotive electronics
• Industrial control systems

Electrical Characteristics:

• Supply Voltage Range: Typically operates from 1.0V to 5.5V.
• Reset Threshold Voltage: 2.63V (typical).
• Reset Output Voltage: Low output voltage when active (typically below 0.4V).
• Supply Current: Very low, typically in the microamp range.

Conclusion:

The LM809M3-2.63/NOPB from Texas Instruments is a reliable and efficient voltage supervisor that provides essential monitoring and reset functionality for low-voltage digital systems. Its compact size, low power consumption, and wide operating temperature range make it an excellent choice for a variety of applications in consumer electronics, automotive, and industrial sectors.