The document describes the NOR gate. It has two or more inputs but only one output. If any input is high, the output is low, and vice versa. The NOR gate is a universal gate that can be used to implement other basic logic gates like AND, OR, and NOT through the use of inverters. It provides examples of how a NOR gate can function as an OR gate, AND gate, and NOT gate by manipulating the inputs and outputs with inverters.

2. NOR GATE
 NOR GATE is a contraction of NOT-OR GATE.
 It has TWO OR MORE INPUTS but have only ONE
OUTPUT.
 If any one of the input is high then output is low and
vice versa

3. NOR Gate
X
Y
Z XYX Y
X
Y
Z
0
0
1
0
1
0
1
0
0
1
1
0
3

4. NOR GATE
 NOR gate is a universal gate.
 Nor gate can be used to implement any gate like AND,
OR, NOT GATES or any combination of these basic
gates.

5. NOR Gate as an OR Gate
XY
X
Y
Z  XY XY
NOR Gate
“Inverter”
X
Y
Z
0
0
0
0
1
1
1
0
1
1
1
1
Equivalent to OR Gate
5

6. NOR Gate as an AND Gate
X
Y
X
Z XYXY XY
Y
NOR Gate
“Inverters”
X
Y
Z
0
0
0
0
1
0
1
0
0
1
1
1
Equivalent to AND Gate
6

7. Nor gate as an NOT gate
Input A
Output Q
0
1
1
0

8. Realisation of logic functions using
nor gates
 Any logic functions can also be implemented using nor
gate
 To achieve this ,first the logic gate function has to be
written in POS(product of sum) form.