Write the truth table for a NAND gate connected as given in Fig. 14.45.

Hence identify the exact logic operation carried out by this circuit

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#### Solution

*A* acts as the two inputs of the NAND gate and *Y* is the output, as shown in the following figure.

Hence, the output can be written as:

`Y = bar(A.A) = barA + barA = barA` ...(i)

The truth table for equation (*i*) can be drawn as:

A |
`(=barA)`Y |

0 | 1 |

1 | 0 |

This circuit functions as a NOT gate. The symbol for this logic circuit is shown as:

Concept: Digital Electronics and Logic Gates

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