Overview
The LM809M3X-2.63/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, ensuring reliable operation in a wide range of applications.
The LM809M3X-2.63/NOPB specifically has a reset threshold of 2.63 V, making it suitable for monitoring 3-V supply voltages. It features an active-low RESET output and is packaged in a compact SOT-23 package, ideal for use in space-constrained and portable equipment.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Reset Threshold | TA = 25°C | 2.59 | 2.63 | 2.66 | V |
| Reset Threshold | TA = –40°C to 85°C | 2.55 | - | 2.70 | V |
| Reset Threshold | TA = 85°C to 105°C | 2.50 | - | 2.76 | 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 |
| VCC to Reset Delay | VCC = VTH to (VTH – 100 mV) | - | 20 | - | µs |
| Supply Current | Typical at TA = 25°C | - | 15 | - | µA |
| RESET Output Voltage Low | VCC = VTH(min), ISINK = 1.2 mA | - | - | 0.3 | V |
| RESET Output Voltage High | VCC > VTH(max), ISOURCE = 500 µA | - | - | 0.8 × VCC | V |
| Junction-to-ambient thermal resistance | - | - | - | 252.0 | °C/W |
Key Features
- Precision monitoring of supply voltages with various threshold options (2.63 V, 2.93 V, 3.08 V, 4.38 V, 4.63 V)
- Active-low RESET output (LM809) and active-high RESET output (LM810)
- 140-ms minimum power-on reset pulse width, 240-ms typical
- Low supply current of 15 µA typical
- Power supply transient immunity
- Fully specified over temperature range –40°C to 105°C
- Compact SOT-23 package
Applications
- Microprocessor Systems
- Computers
- Controllers
- Intelligent Instruments
- Portable/Battery-Powered Equipment
- Automotive Systems
- Factory Automation
- Building Automation
- Programmable Logic Control
- Renewable Energy Systems
Q & A
- What is the primary function of the LM809M3X-2.63/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 LM809M3X-2.63/NOPB?
The reset threshold voltage is 2.63 V.
- What is the typical supply current of the LM809M3X-2.63/NOPB?
The typical supply current is 15 µA.
- What is the duration of the power-on reset pulse?
The minimum power-on reset pulse width is 140 ms, with a typical duration of 240 ms.
- What type of package does the LM809M3X-2.63/NOPB come in?
The component is packaged in a SOT-23 package.
- What are the operating temperature ranges for the LM809M3X-2.63/NOPB?
The component is fully specified over the temperature range of –40°C to 105°C.
- What is the junction-to-ambient thermal resistance of the LM809M3X-2.63/NOPB?
The junction-to-ambient thermal resistance is 252.0 °C/W.
- Is the LM809M3X-2.63/NOPB suitable for use in portable equipment?
Yes, due to its low supply current, it is ideal for use in portable and battery-powered equipment.
- What are some common applications of the LM809M3X-2.63/NOPB?
Common applications include microprocessor systems, computers, controllers, intelligent instruments, and automotive systems.
- Does the LM809M3X-2.63/NOPB have power supply transient immunity?
Yes, the component has built-in power supply transient immunity.
