How Logic Ics Function - A "logical" Explanation

For a newcomer to electronics, the word “logic” from logic IC might look pretty confusing and difficult to understand. Because the logic may does not sound very technical to a layman or somebody who has just entered the world of semiconductors and electronics.
However the “logic” in these devices have indeed some relevance to its actual meaning. These ICs work on a certain logical “thinking” and hence they got the particular name.
The functioning of logic ICs can be explained by comparing the other forms of ICs which are linear in nature. A linear IC as the name suggests will

follow a slope pattern with its output in response to a varying signal, i.e. the response will be directly proportional to the applied input. The magnitude of current and the load connected decides the switching nature of linear devices.

/> In contrast to this, logic ICs behave in quite a different fashion. They either say ‘yes” or a “no” at their outputs in response to voltage levels at their inputs, i.e. they will never show a linearly varying outputs or rather show a logical response by either approving the input signal or simply disapproving it. Any voltage that’s lower than 1.5 volts is normally considered as “0” and anything that’s over 2 might be considered as “1” or a “yes” irrespective of the supply voltage which must never be exceeded above 15 volts DC.
These ICs consists of internal embedded blocks called the gates which are assigned specific relation with their inputs and the output responses.

Article Written By Swagatam

Swagatam is a blogger at

Last updated on 25-07-2016 128 0

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