
7421 
Dual
4Input AND Gates



For other 7400 series TTL IC
datasheets, CLICK HERE

The 7421 IC is composed
of two independent FourInput AND gates.
The truth table for the 4input of the AND 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. For example, if 2 of the inputs were
logical one and two of them were logical zero, then 0*0*1*1 = 0,
therefore the output of the gate would be zero.
By a simpler method, simply consider the fact that the gate will only
be output logical one if and only if ALL inputs are logical one (HIGH).


View Datasheet Immediately 
CLICK HERE




