
7420 
Dual
4Input NAND Gates



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The 7420 IC is composed
of two independent FourInput NAND gates.
The truth table for the 4input of the NAND is identical to that of the
2Input variant. Naming the logical inputs and outputs as zeros and
ones allows for easy calculation of the function performed.
Let inputs be marked as A, B, C, and D. The output will be called X.
Then, A * B * C * D = X Inverted. For example, if 2 of the inputs
were logical one and two of them were logical zero, then 0*0*1*1 = 0,
and the inverted state of 0 would equal 1, so the output of the gate
would be one.
By a simpler method, simply consider the fact that the gate will only
be output logical zero if and only if ALL inputs are logical one
(HIGH).


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