Overview
The SN74AC14D is a Hex Schmitt-Trigger Inverter produced by Texas Instruments. This integrated circuit is part of the 74AC series and is designed to perform the Boolean function Y = A, utilizing Schmitt trigger action. This 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 device is optimized for a 5 V supply voltage and can operate over a range of 2 V to 6 V, making it versatile for various applications. It features balanced CMOS push-pull outputs, which can sink and source similar currents, and is TTL-voltage compatible.
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 | -24 | ||
| IOL (Low-Level Output Current) | mA | 24 | ||
| TA (Operating Free-Air Temperature) | °C | -40 | 85 | |
| tPLH (Propagation Delay, A to Y) | ns | 1.5 | 12 | |
| tPHL (Propagation Delay, A to Y) | ns | 1.5 | 10 | |
| Cpd (Power Dissipation Capacitance) | pF | 25 |
Key Features
- 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.
- CMOS Technology: Features balanced CMOS push-pull outputs that can sink and source similar currents.
- TTL-Voltage Compatible: Inputs are compatible with TTL voltage levels.
- Overvoltage Tolerant Inputs: Inputs can accept levels up to 5.5 V at any valid VCC.
- Low Drive and Slow Edge Rates: Minimizes output ringing and overshoot.
- Voltage Translation: Allows voltage translation from 3.3 V to 5 V.
Applications
The SN74AC14D is suitable for a variety of applications where low drive and minimal output ringing are critical. Some typical applications include:
- Bus Interface Applications: Ideal for bus interfaces where output ringing needs to be minimized.
- Logic Circuits: Used in logic circuits requiring Schmitt trigger action for noise immunity.
- Signal Conditioning: Useful in signal conditioning applications where clean output signals are necessary.
- Counters and Flip-Flops: Can be used in digital circuits such as counters and flip-flops to ensure stable and noise-free operation.
Q & A
- What is the primary function of the SN74AC14D?
The SN74AC14D is a Hex Schmitt-Trigger Inverter, performing the Boolean function Y = A.
- What is the operating voltage range of the SN74AC14D?
The device operates over a supply voltage range of 2 V to 6 V.
- What are the key benefits of the Schmitt trigger action in the SN74AC14D?
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 type of outputs does the SN74AC14D have?
The device features balanced CMOS push-pull outputs that can sink and source similar currents.
- Is the SN74AC14D TTL-voltage compatible?
- What is the maximum operating temperature of the SN74AC14D?
The maximum operating temperature is 85°C.
- Can the SN74AC14D handle overvoltage inputs?
- What are some typical applications of the SN74AC14D?
Typical applications include bus interfaces, logic circuits, signal conditioning, and digital circuits such as counters and flip-flops.
- What is the propagation delay of the SN74AC14D?
The propagation delay (tPLH and tPHL) is typically around 1.5 ns to 12 ns.
- How should unused outputs be handled?
Unused push-pull CMOS outputs must be left disconnected to avoid potential issues.
