LOGIC GATES
TYPES OF GATE
TYPES OF GATE
1. SPECIAL GATE (TRUE GATE)
- one input gate into which output will be based on its input signal
ex. if the input is 1 the output will be also 1
X | Y
0 | 0
1 | 1
A. NOT GATE - one input gate into which input is inverted to get the equivalent output
signal.
ex. if the input is 1 the output will be 0
if the input is 0 the output will be 1
X | Y
1 | 0
0 | 1
2. BASIC GATES
signal.
ex. if the input is 1 the output will be 0
if the input is 0 the output will be 1
X | Y
1 | 0
0 | 1
B. AND GATE - a type of gate which will trigger a high output if and only if all input signals
are high.
ex.if the input of A is 0 and B is 0 the output will be 0
if the input of A is 0 and B is 1 the output will be 0
if the input of A is 1 and B is 0 the output will be 0
if the input of A is 1 and B is 1 the output will be 1
the output will become 1 only if the both input is 1 (high)
A B | Y
0 0 | 0
0 1 | 0
1 0 | 0
1 1 | 1
C. OR GATE - a type of gate which will trigger a low output if and only if all input signals
are low.
ex. if the input of A is 0 and B is also a 0 the output will become 0
if the input of A is 0 and B is 1 the output will become 1
if the input of A is 1 and B is 0 the output will become 1
if the input of A is 1 and B is 1 the output will become 1
the output will become 0 only if the both input is 0 (low)
A B | Y
0 0 | 0
0 1 | 1
1 0 | 1
1 1 | 1
3. UNIVERSAL GATES
A.NAND GATE - a type of gate which will trigger a low output if and only if all input signals
are HIGH.
ex. if the input of A is 0 and B is also a 0 the output will become 1
if the input of A is 0 and B is 1 the output will become 1
if the input of A is 1 and B is 0 the output will become 1
if the input of A is 1 and B is 1 the output will become 0
the output will become 0 only if the both input is 1 (high)
A B | Y
0 0 | 1
0 1 | 1
1 0 | 1
1 1 | 0
are LOW.
ex. if the input of A is 0 and B is also a 0 the output will become 1
if the input of A is 0 and B is 1 the output will become 0
if the input of A is 1 and B is 0 the output will become 0
if the input of A is 1 and B is 1 the output will become 0
the output will become 1 only if the both input is 0 (low)
A B | Y
0 0 | 1
0 1 | 0
1 0 | 0
1 1 | 0
4. COMBINATION GATES
A. X - OR GATE - a type of gate which will trigger a high output if input signals are NOT
THE SAME.
ex. if the input of A is 0 and B is also a 0 the output will become 0
if the input of A is 0 and B is 1 the output will become 1
if the input of A is 1 and B is 0 the output will become 1
if the input of A is 1 and B is 1 the output will become 0
the output will become 1 only if the input is 0 and 1 or 1 and 0
(not the same)
A B | Y
0 0 | 0
0 1 | 1
1 0 | 1
1 1 | 0
B. X-NOR GATE -a type of gate which will trigger a high output if input signals are
THE SAME
ex. if the input of A is 0 and B is also a 0 the output will become 1
if the input of A is 0 and B is 1 the output will become 0
if the input of A is 1 and B is 0 the output will become 0
if the input of A is 1 and B is 1 the output will become 1
the output will become 1 only if the input is 0 and 0 or 1 and 1
(the same)
A B | Y
0 0 | 1
0 1 | 0
1 0 | 0
1 1 | 1
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