Thursday, June 20, 2013
NOR
If we put an NOT Gate
at the output of OR Gate we obtain a
very useful combination called NOR
Gate. A NOR Gate has two or more
inputs but only one output. The NOR
function is the complement of OR
function.
It produces a value of true if and only if both operands are false. In other words, it produces a value of false if and only if at least one operand is true.
| A |
B |
Y |
| T |
T |
F |
| T |
F |
F |
| F |
T |
F |
| F |
F |
T |
If A and B are two
input then output is given by
Truth table for NOR Gate
INPUT
|
OUTPUT
|
|
A
|
B
|
Y = A
NAND B
|
1
|
1
|
0
|
1
|
0
|
0
|
0
|
1
|
0
|
0
|
0
|
1
|
SYMBOL
NAND and NOR Gate are called Universal Gate because we may obtain
all the possible Gates by using these individual Gates as basic building.
NAND and OR Gate may be used to
realize the basic logic functions OR,
AND, and NOT.
