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74HC14N

Hex Schmitt-trigger inverter, 0.8V hysteresis, 11ns, 14-PDIP

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Manufacturer Part：

74HC14N

Package：

14-PDIP

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Description

Product Overview

The 74HC14N from Texas Instruments is a hex Schmitt-trigger inverter. Each of the 6 independent channels converts a slowly-changing or noisy input into a clean, sharp output transition. With hysteresis for noise immunity and 11ns propagation delay, it is essential for signal conditioning and oscillator circuits. Packaged in 14-PDIP.

Key Specifications

Logic Family 74HC (High-Speed CMOS)
Function Hex Schmitt-trigger inverter
Channels 6 (independent)
Propagation Delay 11ns (typ at 4.5V)
Hysteresis 0.8V (typ at 4.5V)
Supply Voltage 2V to 6V
Package 14-PDIP
Operating Temperature -40 to +85 C

Features

  • 6 independent Schmitt-trigger inverters
  • Hysteresis for noise immunity
  • Input signal conditioning and squaring
  • 11ns propagation delay
  • RC oscillator construction (with feedback resistor)
  • Pin-compatible with 74HC04 (but with hysteresis)

Applications

  • Signal conditioning and debouncing
  • RC and crystal oscillator circuits
  • Noisy signal cleanup
  • Level detection and wave shaping

The 74HC14N from Texas Instruments contains six independent Schmitt-trigger inverter gates in a 14-PDIP package. Unlike a standard inverter (74HC04), the Schmitt-trigger input has hysteresis: the threshold for LOW-to-HIGH transition is higher than for HIGH-to-LOW transition, creating a noise margin between the two levels. This hysteresis makes the 74HC14 ideal for cleaning up noisy, slowly-changing, or bouncing signals. A single 74HC14 channel with a feedback resistor and capacitor forms a simple RC oscillator. The hysteresis ensures clean oscillation without the multiple-transition problems of standard inverters. Six channels per package provide ample resources for multiple signal conditioning tasks in one design. The 74HC14 is one of the most useful logic ICs for mixed-signal and interface design.

Each Schmitt-trigger inverter in the 74HC14N has two threshold voltages: a positive-going threshold (VT+) and a negative-going threshold (VT-), with the difference being the hysteresis voltage (approximately 0.8V at 4.5V supply). When the input rises past VT+, the output switches LOW. When the input falls past VT-, the output switches HIGH. Input signals that slowly cross the threshold or have noise superimposed will not cause multiple output transitions because the input must cross both VT+ and VT- to toggle the output. For RC oscillator construction, a resistor connects from the output back to the input, and a capacitor from the input to ground. The capacitor charges through the resistor until VT+ is reached, the output switches, and the capacitor discharges through the resistor until VT- is reached, and the cycle repeats.

Pin Name Function
1 1A Gate 1 input
2 1Y Gate 1 output (inverted, Schmitt)
3 2A Gate 2 input
4 2Y Gate 2 output
5 3A Gate 3 input
6 3Y Gate 3 output
7 GND Ground
8 4Y Gate 4 output
9 4A Gate 4 input
10 5Y Gate 5 output
11 5A Gate 5 input
12 6Y Gate 6 output
13 6A Gate 6 input
14 VCC Supply voltage (2-6V)
  • Switch debounce conditioning with Schmitt-trigger hysteresis for clean logic edges
  • Simple RC oscillator using one gate with feedback resistor and capacitor
  • Sensor signal cleanup converting analog thresholds to clean digital outputs
  • Crystal oscillator buffer with hysteresis for reliable startup and stability
Model Manufacturer Key Difference
74HC04N TI Standard hex inverter (no hysteresis)
74HCT14N TI TTL-compatible inputs, same Schmitt function
CD40106BE TI CMOS Schmitt trigger, 3-15V supply
74LVC14A TI 1.65-3.6V, low-voltage Schmitt trigger
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