Question

Draw the legend of the following gates using for inputs
designations A, B, C, D and for outputs - Y:
- circuit AND with two inputs;
- OR circuit with three inputs;
- inverter;
- NAND circuit with four inputs.
2. Write down a boolean expression for each logical element from item 1.
3. Draw the truth table for each logical element from item 1.​

Answer 1

The logic or Boolean expression given for a logic NAND gate is that for Logical Addition, which is the opposite to the AND gate, and which it performs on the complements of the inputs. The Boolean expression for a logic NAND gate is denoted by a single dot or full stop symbol, ( . ) with a line or Overline, ( ‾‾ ) over the expression to signify the NOT or logical negation of the NAND gate giving us the Boolean expression of: A.B = Q.

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