The document discusses NAND gates and their ability to act as universal logic gates. It defines logic gates and universal logic gates. It then explains that a NAND gate produces an output that is false only if all its inputs are true, which is the complement of an AND gate. The document shows how NAND gates can be used to create NOT, AND and OR gates, demonstrating that all basic logic gates can be made using only NAND gates, giving it the title of universal gate.

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NAND Gate

2. Logic Gate
A logic gate is an elementary building block of
a digital circuit. Most logic gates have two
inputs and one output.

3. What is Universal Logic Gates?
A universal logic gate is a logic gate that can be
used to construct all other logic gates.
1. NAND Gate
2. NOR Gate

4. NAND Gate
NAND gate (negative-AND) is a logic gate
which produces an output which is false only
if all its inputs are true; thus its output is
complement to that of the AND gate.

5. NAND Gate
Boolean Expression
Truth Table

6. NAND Gate As Universal Gate
NAND gate as NOT gate

7. NAND Gate As Universal Gate
NAND gate as NOT gate

8. NAND Gate As Universal Gate
NAND gate as AND gate

9. NAND Gate As Universal Gate
NAND gate as OR gate

10. NAND Gate As Universal Gate
NAND gate as AND gate

11. NAND Gate As Universal Gate
So we can see that all the
three basic gates can be
made by only using NAND
gates, that’s why this gate is
called Universal Gate

12. Any Question??