Overview
The LM809M3-2.93/NOPB is a microprocessor supervisory circuit produced by Texas Instruments. This component is designed to monitor the power supplies in microprocessor and digital systems, providing a reset signal during power-up, power-down, and brown-out conditions. The LM809 series offers precision monitoring of supply voltages with various threshold options, making it a reliable choice for ensuring system stability.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| Reset Threshold (VTH) | 2.89 | 2.93 | 2.96 | V |
| Reset Active Timeout Period | 140 | 240 | 560 | ms |
| VCC to Reset Delay | 20 | - | - | µs |
| RESET Output Voltage Low (LM809) | 0.3 | - | - | V |
| RESET Output Voltage High (LM809) | 0.8 × VCC | - | - | V |
| Supply Current | - | 15 | - | µA |
| Operating Temperature Range | -40 | - | 105 | °C |
| Package Type | - | SOT-23 | - | - |
Key Features
- Precision monitoring of supply voltages with threshold options: 2.63 V, 2.93 V, 3.08 V, 4.38 V, and 4.63 V.
- Active-low RESET output for LM809.
- 140-ms minimum power-on reset pulse width, 240-ms typical.
- Low supply current of 15 µA typical.
- Power supply transient immunity.
- Ensured RESET output valid for VCC ≥ 1 V.
- Fully specified over temperature range of -40°C to 105°C.
Applications
- Factory Automation
- Building Automation
- Programmable Logic Control
- Renewable Energy
- Microprocessor Systems
- Computers
- Controllers
- Intelligent Instruments
- Portable/Battery-Powered Equipment
- Automotive Systems
Q & A
- What is the primary function of the LM809M3-2.93/NOPB?
The primary function is to monitor the power supply voltage and provide a reset signal to the microprocessor during power-up, power-down, and brown-out conditions.
- What are the available reset threshold options for the LM809 series?
The available threshold options are 2.63 V, 2.93 V, 3.08 V, 4.38 V, and 4.63 V.
- What is the typical supply current of the LM809M3-2.93/NOPB?
The typical supply current is 15 µA.
- What is the operating temperature range of the LM809M3-2.93/NOPB?
The operating temperature range is -40°C to 105°C.
- What type of package does the LM809M3-2.93/NOPB come in?
The component comes in a SOT-23 package.
- What is the minimum power-on reset pulse width?
The minimum power-on reset pulse width is 140 ms.
- Is the RESET output valid for VCC below 1 V?
No, the RESET output is ensured to be valid for VCC ≥ 1 V.
- What are some common applications of the LM809M3-2.93/NOPB?
Common applications include factory automation, building automation, programmable logic control, renewable energy, microprocessor systems, and more.
- Does the LM809M3-2.93/NOPB have power supply transient immunity?
- What is the junction-to-ambient thermal resistance of the LM809M3-2.93/NOPB in a SOT-23 package?
The junction-to-ambient thermal resistance is 252.0 °C/W.
