Page 1095 - Basic Electrical Engineering

iii. NAND gate as OR gate

Figure 16.15 Three basic gates using NAND gates

Figure 16.16 Three basic gates using NOR gates

16.10.2 Use of NOR Gate to Form the Three Basic Gates

Now we shall see the use of a NOR gate to form the three basic gates.

i. NOR gate as NOT gate

If all the inputs of the NOR gate are connected together, we obtain a NOT gate as shown
above.
ii. NOR gate as OR gate
The OR operation is obtained by a NOR gate followed by a single input NOR gate as shown.

iii. NOR gate as AND gate
The AND operation by NOR gates is achieved as shown. The inputs at A and B are inverted
by 1-input NOR gates. The inverted inputs are old to a NOR gate.

16.11 FLIP-FLOPS