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close this bookDigital Teaching Aid (DED Philippinen, 86 p.)
close this folderKarnaugh Mapping - Lesson 4
close this folderLesson Plan
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View the documentIntroduction
View the documentKarnaugh map
View the documentTruth table to Karnaugh map
View the documentPairs, Quads, and Octets
View the documentOverlapping and Rolling

Truth table to Karnaugh map

The starting point for digital circuit design is usually the truth table which gives us the following information:

Under which input condition occurs a certain output condition.

Two variable map


Fig. 4-1: Two variable Karnaugh map

The truth table outputs are translated into the Karnaugh map. Each position in the map represents a certain fundamental product.

Three variable map


Fig. 4-2: Three variable Karnaugh map

Four variable map

Many digital systems process 4 bit numbers. For this reason, logic circuits are often designed to handle 4 input variables.


(see Fig. 4-3)

Fig. 4-3: Four variable Karnaugh map