What is a hex inverter used for?

Other Hardware General Electronics
1

Hi,

What is a hex inverter used for?
For example: HD74LS04P

Thanks!

2

Inverting six digital signals, simultaneously.

3

AWOL:
Inverting six digital signals, simultaneously.

Thanks,

Pin 1 is input and PIN 2 is output?
When Pin 1 is true I get PIN 2 false?

4

Correct.

5

KeithRB:
Correct.

Thank you very much :slight_smile:

6

There are various uses beyond the obvious NOT gate. Cleaning up a noisy signal, adding small delay, level shifting, converting between logic families, crystal oscillator, relaxation oscillator, analog amplifier...

7

There are different types of invertor. The logic functions are the same. You have 6 indepentant not gates. Different families will have different logic levels and different delays. Ordinary logic gates assume the signal passes very quickly from one state to the other. At some voltage level the gates will act as linear amplifiers, unless they are scmidt gates. These have hysteresis and have different levels going up to coming down and can be used to clean up noisy signals. They are very useful in practice.

8

how is a hex inverter different from a schmitt trigger inverter?

9

The input of standard inverter will always have the same "switch" threshold for detecting a "0" or a "1". A Schmitt trigger has a dual threshold point for a signal that swings between 0 and 1 in a non-expected way... allowing it to be used in signal "conditioning" circuits.... EXAMPLE: You would feed an "inverter" with a known TTL compatible signal... all will be fine. You would feed a Schmitt trigger with a signal that did not necessarily come from a TTL family compatible device, like a LM555, a Comparator, and AC signal that has been rectified and voltage limited.... etc and out the other side will emerge a nice TTL compatible signal with parts of it smoothed out (state transitions reduced) where the input signal was "between" the threshold points. If you used an inverter in the place of an Schmitt trigger there could have been a possible stream of transitions between 1 and 0 and that may be undesired.

Probably not the best explanation... now that I read it.