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74HC14 IC: Pinout, Equivalent, Feature [Video]

Author: Iggy
Date: 18 Jan 2021
 3448

74HC14 is Hex Inverting Schmitt Trigger IC.

74HC14 is a member of the 74XXXX Integrated Circuit Series, consisting of logic gates. This module is also referred to as the hexadecimal Schmitt trigger. It can be used in six separate Schmitt trigger input inverters with standard push-pull outputs.

This blog provides you with a basic overview of the 74HC14 Hex Inverting Schmitt Trigger IC, including its pin descriptions, functions and specifications, equivalent products, etc., to help you quickly understand what 74HC14 is.

We will be glad to find that this blog can be useful for people loving electronic components :)

A Brief Introduction to 74HC14 IC

Catalog

74HC14 Pinout

74HC14 Feature

74HC14 Equivalent

Where to Use 74HC14

How to Use 74HC14

74HC14 Switching Time

74HC14 Application

74HC14 Package

Component Datasheet


74HC14 Pinout

Refer to the 74HC14 Pinout and choose the appropriate package depending on your requirement. Here are descriptions for each pin.

74HC14 IC Pinout

Pin Number

Description

INPUT OF INVERTING SCHMITT TRIGGER GATE

1

1A-INPUT of GATE 1

3

2A-INPUT of GATE 2

5

3A-INPUT of GATE 3

9

4A-INPUT of GATE 4

11

5A-INPUT of GATE 5

13

6A-INPUT of GATE 6

SHARED TERMINALS

7

GND- Connected to ground

14

VCC-Connected to positive voltage to provide power to all six gates 

OUTPUT OF INVERTING SCHMITT TRIGGER GATE

2

1Y-OUTPUT of GATE 1

4

2Y-OUTPUT of GATE 2  

6

3Y-OUTPUT of GATE 3

8

4Y-OUTPUT of GATE 4

10

5Y-OUTPUT of GATE 5

12

6Y-OUTPUT of GATE 6


74HC14 Features

  • Supply voltage range: -0.5V to +7.0V
  • Maximum current allowed to draw through each gate output: 25mA
  • Maximum total current allowed through VCC or GND pin: 50mA
  • Totally lead free
  • TTL outputs
  • High noise immunity
  • Maximum ESD: 2KV
  • Typical Rise Time: 85-625ns (depending on supply voltage)
  • Typical Fall Time: 85-625ns (depending on supply voltage)
  • Operating temperature: -55°C to 125 °C

74HC14 Equivalent

MC14584, CD40106, each op-amp can be configured to function as the Schmitt trigger gate.


Where to Use 74HC14

74HC14

74HC14 IC

To understand the use of 74HC14, consider:

  • Case 1: Where you want to convert the waveform signal to the square wave. Schmitt trigger gates in 74HC14 can cover non-square wave forms with square waves. With the Schmitt trigger gate, we can convert the sinusoidal or triangular wave into a square wave.
  • Case 2: If you want a logic inverter. Inverter Schmitt triggers in this chip can provide output that is a negated logic input. These chip gates can be used to get inverted logics for controllers or digital electronics.
  • Case3: To eliminate noise in digital electronics. In digital electronics, noise causes major errors when using the 74HC14 chip is ideal.

The use of 74HC14 is further promoted with multiple gates and fast output.


How to Use 74HC14

As mentioned above, 74HC14 has six INVERTING SCHMITT TRIGGER GATES which can be used as six individual gates. The simplified internal structure can be described as follows.

74HC14 Internal Structure

Now, in order to understand the use of the gate, let us choose a single gate and connect the power to the chip. Also provide an analog signal to the input.

an analog signal to the 74HC14 input

As shown in the circuit, we are giving a sinusoidal wave at the input and taking Vout as the gate output. Once we draw the input and output graph, we're going to have something like this.

74HC14 Sinusoidal Wave

The Schmitt Trigger operating principle is really simple, the Inverting Schmitt Trigger output will be LOW only when the input signal voltage level crosses its threshold voltage (+Vt).

As shown in the figure, the output voltage (Vin) is HIGH up to the point where the input voltage (Vin) reaches the output voltage (Vt+). Once the threshold voltage is reached, the output voltage is lower. Output voltage remains low until the input voltage drops to low threshold voltage (Vt-). Once that point has been reached, the output voltage is again HIGH. This cycle is going on.

As shown in the graph, we can see when the sinusoidal signal is given as an input to the square wave output. We can use every gate like this to get the desired output.


74HC14 Switching Time

The gates in 74HC14 take some time to provide output to the input. This time delay is called switching times. Each gate will take time to turn it on and off. Let us consider the switching diagram of the gate to understand this better.

74HC14 Switching Time

There are two delays that happen when you switch. The two parameters are RISETIME (tPHL) and FALLTIME (tPLH ).

In the graph, VoH goes LOW when INPUT reaches the threshold and VoH goes HIGH when INPUT goes below the threshold voltage. It's the output voltage in another sense.

As you can see in the graph, there is a delay in time between LOGIC INPUT going HIGH and VoH going LOW. This delay in responding is called RISETIME (tPHL ). The RISETIME (tPHL) number is 95ns.

Similarly, there is a time delay in the graph between LOGIC INPUT going LOW and VoH going HIGH at the OUTPUT. This delay in the response is called FALLTIME (tPLH ). The faltimer (tPLH) is 95ns.

Total for each cycle is 192ns. These delays must be considered at higher frequencies, otherwise there will be major errors. There will also be false triggers and noise beyond operating frequencies.


74HC14 Application

  • General purpose logic
  • PCs and notebooks
  • TV, DVD, Set Top Box
  • Networking
  • Digital systems

74HC14 Package

74HC14 Package: SO-14

74HC14 Package: TSSOP-14


That’s all for our introduction to the 74HC14 IC. If you find this blog useful, please bookmark our website Apogeeweb, we will provide you with electronic component blogs, industry news, tools, etc. that you are interested in. Stay tuned for our next blog…

Component Datasheet

74HC14 Datasheet

Ordering & Quality

Photo Mfr. Part # Company Description Package PDF Qty Pricing
(USD)
74HC147D-653 74HC147D-653 Company:NXP USA Inc. Remark:IC 10:4 LINE PRIORITY ENC 16SOIC Package:16-SOIC (0.154", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
Call
Inquiry
74HC147DB-112 74HC147DB-112 Company:NXP USA Inc. Remark:IC 10-4 LINE PRIORITY ENC 16SSOP Package:16-SSOP (0.209", 5.30mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
Call
Inquiry
74HC148FPEL-E 74HC148FPEL-E Company:Renesas Electronics America Inc Remark: Package:N/A
N/A
In Stock:On Order
Inquiry
Price:
729+: $0.34320
Inquiry
74HC148P-E 74HC148P-E Company:Renesas Electronics America Inc Remark: Package:N/A
N/A
In Stock:On Order
Inquiry
Price:
382+: $0.65521
Inquiry
74HC14BQ-115 74HC14BQ-115 Company:Nexperia USA Inc. Remark:IC INVERTER SCHMITT 6CH 14DHVQFN Package:14-DHVQFN (2.5x3)
DataSheet
In Stock:9000
Inquiry
Price:
3000+: $0.09630
6000+: $0.09095
15000+: $0.08293
30000+: $0.07758
75000+: $0.06955
150000+: $0.06688
Inquiry
74HC14N-652 74HC14N-652 Company:NXP USA Inc. Remark:IC INVERTER SCHMITT 6CH 14DIP Package:14-DIP
DataSheet
In Stock:On Order
Inquiry
Price:
Call
Inquiry
74HC14N-Q100U 74HC14N-Q100U Company:NXP USA Inc. Remark:IC INVERTER SCHMITT 6CH 14DIP Package:14-DIP
N/A
In Stock:On Order
Inquiry
Price:
Call
Inquiry
CD74HC147E CD74HC147E Company:Texas Instruments Remark:IC 10-4LN PRIORTY ENCODER 16DIP Package:16-DIP (0.300", 7.62mm)
DataSheet
In Stock:2416
Inquiry
Price:
1+: $0.66000
10+: $0.57800
25+: $0.54240
100+: $0.44280
250+: $0.41124
500+: $0.35000
1000+: $0.28000
2500+: $0.25375
5000+: $0.23625
Inquiry
CD74HC147M CD74HC147M Company:Texas Instruments Remark:Priority Encoder 1 x 10:4 16-SOIC Package:16-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
1+: $0.61000
10+: $0.53500
25+: $0.50240
100+: $0.40990
250+: $0.38072
500+: $0.32400
1000+: $0.25920
2500+: $0.23490
5000+: $0.21870
1042+: $0.24003
Inquiry
CD74HC147M96 CD74HC147M96 Company:Texas Instruments Remark:Priority Encoder 1 x 10:4 16-SOIC Package:16-SOIC (0.154"", 3.90mm Width)
DataSheet
In Stock:On Order
Inquiry
Price:
1+: $0.59000
10+: $0.50600
25+: $0.47240
100+: $0.37800
250+: $0.35100
500+: $0.29700
1000+: $0.21060
2500+: $0.19305
5000+: $0.17955
10000+: $0.16740
25000+: $0.16200
Inquiry

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