74HC14D Hex Inverter High-Speed CMOS Low Power Schmitt Trigger Wide Voltage (2-6V) High Noise Immunity Direct TTL Compatibility Balanced Propagation Industry Standard Reliability

74HC14D Hex Inverter High-Speed CMOS Low Power Schmitt Trigger Wide Voltage (2-6V) High Noise Immunity Direct TTL Compatibility Balanced Propagation Industry Standard Reliability

Features 

High speed: tpd = 11 ns (typ.) at VCC = 5 V

Low power dissipation: ICC = 1.0 µA (max) at Ta = 25℃

High noise immunity: VH = 1.1 V (typ.) at VCC = 4.5 V

Balanced propagation delays: tPLH ≈ tPHL

Wide operating voltage range: VCC(opr) = 2.0 to 6.0 V

Applications

1. Signal Conditioning and Shaping

This is its most classic application. The Schmitt-trigger input structure makes it insensitive to slowly changing or noisy signals.

Switch Debouncing: Eliminates the physical bouncing of mechanical switches or buttons, ensuring a single press generates only one clean pulse.

Waveform Shaping: Converts analog waveforms like sine or triangle waves into square digital signals.

Noise Filtering: Recovers a clean digital logic level from signals with environmental noise, often from long transmission lines.

2. Pulse Generation and Waveform Creation

Its hysteresis property allows it to easily build simple oscillators and pulse generators.

Astable Multivibrator: Requires just one resistor and one capacitor to form a simple and reliable square wave generator for creating clock signals

or timing pulses. This is a very common, low-cost clock source in systems like microcontrollers.

Pulse Detector: Can be designed to detect the edges (rising or falling) of an input signal and generate a corresponding output pulse.

3. Level Shifting and Interfacing

While its operating voltage range is 2V to 6V, it can still serve as an interface in mixed-voltage systems.

TTL-Compatible Interface: The 74HC14D can directly connect to 5V TTL logic systems and provide CMOS-level output, acting as a buffer between the two logic families.

4. Delay Lines

Utilizing its fixed propagation delay time, it can be used to construct simple delay circuits. Connecting multiple inverters in series can achieve longer, fixed delays.

Description

The 74HC14D is a high speed CMOS SCHMITT INVERTER fabricated with silicon gate C2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. Pin configuration and function are the same as the 74HC04D but the inputs have 25% VCC hysteresis and with its schmitt trigger function, the 74HC14D can be used as a line receivers which will receive slow input signals.

All inputs are equipped with protection circuits against static discharge or transient excess voltage.

INFORMATION

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