BSIT LESSON: and gate

LOGIC GATES

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

2. BASIC GATES

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

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

B. NOR GATE - a type of gate which will trigger a high 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 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

BSIT LESSON

Thursday, September 11, 2014

Logic Gates (Comalod)