23.
(Continued)
AB is now
isolated.
b. Next, draw the logic symbol which will remove the vinculum--in this example, a NAND
symbol. The inverter symbol removes the vinculum. Remember, nothing under a
vinculum may be separated until the vinculum has been removed. The completed
logic diagram is shown below.
AB is indicative of a NAND gate because of the vinculum which extends over both letters;
however, AB could also have been drawn correctly by placing an inverter at any point
from the output of the ANDed AB to the input of the next AND gate, as shown below.
An INVERTER
could have been
placed at any point along this line to make ABC a
true statement. Normally, it is at the output of gate.
Convert the Boolean expression below to a logic diagram.
H+ART
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