Overview
The LM809M3-4.63/NOPB is a microprocessor supervisory circuit produced by Texas Instruments. This 3-pin device 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. It is part of the LM809 and LM810 series, which offer precision monitoring of supply voltages with various reset threshold options.
The LM809M3-4.63/NOPB has an active-low RESET output and is specifically set to a reset threshold of 4.63 V, making it suitable for monitoring 5-V supply voltages. This device ensures a reliable and stable operation of microprocessors by maintaining a reset signal for a minimum of 240 ms after the supply voltage rises above the threshold.
Key Specifications
| Parameter | Min | |||
|---|---|---|---|---|
| Reset Threshold (VTH) | 4.56 | 4.63 | 4.70 | V |
| Reset Active Timeout Period (TA = -40°C to 85°C) | 140 | 240 | 560 | ms |
| Reset Active Timeout Period (TA = 85°C to 105°C) | 100 | - | 840 | ms |
| RESET Output Voltage Low (VCC > 1 V, ISINK = 50 µA) | 0.3 | - | - | V |
| Supply Current (Typical) | - | 15 | - | µA |
| Operating Temperature Range | -40 | - | 105 | °C |
| Package Type | - | SOT-23 | - | - |
| Package Body Size (Nominal) | - | 2.92 mm × 1.30 mm | - | - |
Key Features
- Precision monitoring of supply voltages with reset threshold options: 2.63 V, 2.93 V, 3.08 V, 4.38 V, and 4.63 V.
- Active-low RESET output for LM809 and active-high RESET output for LM810.
- Ensured RESET output valid for VCC ≥ 1 V.
- Low supply current of 15 µA typical.
- Power supply transient immunity.
- 140-ms minimum power-on reset pulse width, 240-ms typical.
- 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 LM809M3-4.63/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 is the reset threshold voltage for the LM809M3-4.63/NOPB?
The reset threshold voltage is 4.63 V.
- What is the typical reset active timeout period for the LM809M3-4.63/NOPB?
The typical reset active timeout period is 240 ms.
- What is the supply current of the LM809M3-4.63/NOPB?
The supply current is typically 15 µA.
- What is the operating temperature range of the LM809M3-4.63/NOPB?
The operating temperature range is -40°C to 105°C.
- What package type is the LM809M3-4.63/NOPB available in?
The device is available in a SOT-23 package.
- What are the dimensions of the SOT-23 package?
The dimensions are 2.92 mm × 1.30 mm (nominal).
- Is the LM809M3-4.63/NOPB suitable for use in portable equipment?
Yes, it is suitable due to its low supply current.
- What are some common applications of the LM809M3-4.63/NOPB?
Common applications include factory automation, building automation, programmable logic control, and microprocessor systems.
- Does the LM809M3-4.63/NOPB have power supply transient immunity?
Yes, it has power supply transient immunity.
