Overview
The SN74LS14DR is a hex Schmitt-trigger inverter integrated circuit produced by Texas Instruments. This component is part of the 74LS series, known for its low power consumption and high noise immunity. Each circuit within the SN74LS14 functions as an inverter, but with the added benefit of Schmitt-trigger action, which provides different input threshold levels for positive-going and negative-going signals. This feature enhances the circuit's ability to handle slow input ramps and noisy environments, ensuring clean and jitter-free output signals.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC (D) | - |
| Pins | 14 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Supply Voltage Range | 4.75 to 5.25 | V |
| Positive-Going Threshold Voltage (VT+) | 1.4 to 1.9 | V |
| Negative-Going Threshold Voltage (VT–) | 0.5 to 0.8 | V |
| Propagation Delay Time (tPLH, tPHL) | 15 to 22 | ns |
| Input Current (ICCL) | 12 to 21 | mA |
| Junction-to-Ambient Thermal Resistance (RθJA) | 90.1 | °C/W |
Key Features
- Operation From Very Slow Edges: The SN74LS14 can be triggered from very slow input ramps, ensuring clean and jitter-free output signals.
- Improved Line-Receiving Characteristics: Enhanced performance in receiving signals over long lines.
- High Noise Immunity: The Schmitt-trigger action provides high noise immunity, making it suitable for noisy environments.
- Temperature Compensation: The circuits are temperature compensated, maintaining consistent performance across a range of temperatures.
Applications
- HVAC Gateways: Used in heating, ventilation, and air conditioning systems for reliable signal processing.
- Residential Ductless Air Conditioning Outdoor Units: Enhances the reliability of outdoor units in residential air conditioning systems.
- Robotic Controls: Utilized in robotic systems for stable and noise-immune signal handling.
- Industrial Stepper Motors: Applied in industrial automation for precise motor control.
- Power Meter and Power Analyzers: Used in power measurement and analysis equipment for accurate signal processing.
- Digital Input Modules for Factory Automation: Employed in factory automation systems to ensure reliable digital input handling.
Q & A
- What is the primary function of the SN74LS14DR?
The primary function of the SN74LS14DR is to act as a hex Schmitt-trigger inverter, providing clean and jitter-free output signals even from slow input ramps. - What is the operating temperature range of the SN74LS14DR?
The operating temperature range is from 0°C to 70°C. - What is the supply voltage range for the SN74LS14DR?
The supply voltage range is from 4.75 V to 5.25 V. - What are the key features of the SN74LS14DR?
The key features include operation from very slow edges, improved line-receiving characteristics, high noise immunity, and temperature compensation. - What are some common applications of the SN74LS14DR?
Common applications include HVAC gateways, residential ductless air conditioning outdoor units, robotic controls, industrial stepper motors, power meters, and digital input modules for factory automation. - What is the propagation delay time for the SN74LS14DR?
The propagation delay time (tPLH, tPHL) is between 15 ns and 22 ns. - How many pins does the SN74LS14DR have?
The SN74LS14DR has 14 pins. - What package type is the SN74LS14DR available in?
The SN74LS14DR is available in a SOIC (D) package. - What is the junction-to-ambient thermal resistance (RθJA) of the SN74LS14DR?
The junction-to-ambient thermal resistance (RθJA) is 90.1 °C/W. - Why is the Schmitt-trigger action important in the SN74LS14DR?
The Schmitt-trigger action provides high noise immunity and ensures clean output signals even from noisy or slow input ramps.
