Overview
The LM809M3X-2.93/NOPB is a 3-pin voltage supervisor (reset IC) designed by Texas Instruments, although it was originally developed by National Semiconductor before the acquisition. This component is used 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 is known for its precision monitoring of supply voltages and is available in several threshold options, including 2.63 V, 2.93 V, 3.08 V, 4.38 V, and 4.63 V. It is a superior upgrade to the MAX809 and MAX810 and is fully specified over temperature.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOT-23 (DBZ) | - |
| Pins | 3 | - |
| Operating Temperature Range | -40 to 105 | °C |
| Reset Threshold | 2.93 V | V |
| Power-On Reset Pulse Width | 140 ms (min), 240 ms (typ) | ms |
| Supply Current | 15 µA (typ) | µA |
| RESET Output Voltage Low | 0.3 V (VCC > 1 V, ISINK = 50 µA) | V |
| Junction-to-Ambient Thermal Resistance | 252.0 °C/W | °C/W |
Key Features
- Precision monitoring of supply voltages with available threshold options: 2.63 V, 2.93 V, 3.08 V, 4.38 V, and 4.63 V.
- Superior upgrade to MAX809 and MAX810.
- Fully specified over temperature.
- 140-ms minimum power-on reset pulse width, 240-ms typical.
- Active-low RESET output for LM809.
- Ensured RESET output valid for VCC ≥ 1 V.
- Low supply current of 15 µA typical.
- Power supply transient immunity.
Applications
- Microprocessor systems.
- Computers and controllers.
- Factory automation and building automation.
- Programmable logic control (PLC).
- Renewable energy systems.
- Intelligent instruments.
- Portable/battery-powered equipment.
- Automotive systems.
Q & A
- What is the primary function of the LM809M3X-2.93/NOPB?
The primary function is to monitor the power supply voltage and assert a reset signal when the voltage falls below the specified threshold.
- What are the available 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 power-on reset pulse width for the LM809?
The typical power-on reset pulse width is 240 ms, with a minimum of 140 ms.
- What is the supply current of the LM809M3X-2.93/NOPB?
The supply current is typically 15 µA.
- What type of package does the LM809M3X-2.93/NOPB come in?
The component comes in a SOT-23 (DBZ) package with 3 pins.
- What is the operating temperature range of the LM809M3X-2.93/NOPB?
The operating temperature range is -40°C to 105°C.
- Is the LM809M3X-2.93/NOPB suitable for use in portable equipment?
Yes, it is ideal for use in portable equipment due to its low supply current.
- What kind of output does the LM809 have?
The LM809 has an active-low RESET output.
- Does the LM809 provide power supply transient immunity?
Yes, it provides power supply transient immunity.
- What are some common applications of the LM809M3X-2.93/NOPB?
Common applications include microprocessor systems, computers, controllers, factory automation, and portable/battery-powered equipment.
