14.16 Write the truth table for a NAND gate connected as given in Fig. 14.37.

Figure 14.37

Hence identify the exact logic operation carried out by this circuit.

Hint: Identify the truth table for a given circuit.
Step: Draw the truth table.

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

Hence, the output can be written as:

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

A

Y=(A)

0

1

1

0

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