Overview
The SN74AC14N is a hex Schmitt-trigger inverter integrated circuit produced by Texas Instruments. This device contains six independent inverters, each performing the Boolean function Y = A. The Schmitt-trigger action provides different input threshold levels for positive-going and negative-going signals, enhancing noise immunity and ensuring clean, jitter-free output signals even with slow input ramps.
The SN74AC14N operates over a supply voltage range of 2V to 6V and is suitable for various applications requiring signal inversion and noise reduction. It is available in several package types, including PDIP, SOIC, SSOP, SOP, and TSSOP, making it versatile for different design needs.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | 6 | |
| VI (Input Voltage) | V | 0 | VCC | |
| VO (Output Voltage) | V | 0 | VCC | |
| IOH (High-Level Output Current) | mA | -12 (VCC = 3V) | -24 (VCC = 4.5V, 5.5V) | |
| IOL (Low-Level Output Current) | mA | 12 (VCC = 3V) | 24 (VCC = 4.5V, 5.5V) | |
| TA (Operating Free-Air Temperature) | °C | -40 | 85 | |
| tPLH (Propagation Delay Time, Low to High) | ns | 1.5 | 5 | 10 |
| tPHL (Propagation Delay Time, High to Low) | ns | 1.5 | 5 | 9.5 |
| VT+ (Positive-Going Threshold Voltage) | V | 0.8 (VCC = 3V) | 1.8 | 2.2 |
| VT- (Negative-Going Threshold Voltage) | V | 0.5 (VCC = 3V) | 0.8 | 1 |
Key Features
- VCC Operation Range: 2V to 6V, allowing for flexibility in different voltage environments.
- Schmitt-Trigger Action: Provides different input threshold levels for positive-going and negative-going signals, enhancing noise immunity.
- Temperature Compensated: Ensures clean, jitter-free output signals even with slow input ramps.
- Balanced CMOS Push-Pull Outputs: Capable of sinking and sourcing similar currents, minimizing output ringing.
- Input Voltage Tolerance: Inputs accept voltages up to 5.5V at any valid VCC, making it ideal for voltage translation.
- Low Drive and Slow Edge Rates: Minimizes overshoot and undershoot on the outputs, suitable for bus interface applications.
- ESD Protection: Human body model (HBM) and charged device model (CDM) ESD protection to prevent damage from electrostatic discharge.
Applications
- Synchronize Inverted Clock Inputs: Useful in synchronizing clock signals to ensure proper timing in digital circuits.
- Debounce a Switch: The Schmitt-trigger action helps in debouncing switch inputs, reducing the effect of contact bounce.
- Invert a Digital Signal: Basic function of inverting digital signals, which is essential in various digital logic circuits.
- Bus Interface Applications: Suitable for applications where output ringing is a concern, such as in D-Type flip-flops and counters.
Q & A
- What is the operating voltage range of the SN74AC14N?
The SN74AC14N operates over a supply voltage range of 2V to 6V.
- What is the propagation delay time of the SN74AC14N?
The propagation delay time (tPLH and tPHL) is typically around 5ns, with a maximum of 10ns for tPLH and 9.5ns for tPHL at VCC = 5V.
- What are the input and output voltage ratings for the SN74AC14N?
The inputs and outputs can handle voltages from 0V to VCC, with inputs tolerant up to 5.5V at any valid VCC.
- What are the key features of the Schmitt-trigger action in the SN74AC14N?
The Schmitt-trigger action provides different input threshold levels for positive-going and negative-going signals, enhancing noise immunity and ensuring clean, jitter-free output signals.
- What are the typical applications of the SN74AC14N?
Typical applications include synchronizing inverted clock inputs, debouncing switches, inverting digital signals, and use in bus interface applications.
- What is the maximum output current rating for the SN74AC14N?
The maximum output current rating is 35 mA per output and 70 mA total for the part.
- What are the ESD protection ratings for the SN74AC14N?
The device has ESD protection ratings of ±4000V for the human body model (HBM) and ±2000V for the charged device model (CDM).
- What are the thermal characteristics of the SN74AC14N?
The junction-to-ambient thermal resistance varies by package type, with values such as 93.4°C/W for the WQFN package.
- What are the available package types for the SN74AC14N?
The device is available in PDIP, SOIC, SSOP, SOP, and TSSOP packages.
- What is the operating temperature range for the SN74AC14N?
The operating free-air temperature range is from -40°C to 85°C.
