LESSON 03 – LOGIC GATES (NAND & NOR) & EQUIVALENT CIRCUITS

LESSON NOTE 1 – NAND AND NOR

NOR GATE

• A NOR gate is the logical equivalent of an OR gate followed by a NOT gate.  A NOR gate will only give result of 1 (true) when both inputs are 0 (false).
• The logic diagram for a NOR gate is:

• The logic table for a NOR gate is the following:

A	B	Q
0	0	1
0	1	0
1	0	0
1	1	0

NAND GATE

• A NAND gate is the logical equivalent of an AND gate followed by a NOT gate.  A NAND gate will always give a result of 1 (true) if at least one of the inputs are 0 (false).
• The logic diagram for a NAND gate is:

• The logic table for a NOR gate is the following:

A	B	Q
0	0	1
0	1	1
1	0	1
1	1	0