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Tuesday, 26 June 2012

Logic Gates..Kursus Amalan Kejuruteraan


LOGIC GATES AND COMBINATIONAL CIRCUITS
A combinational circuit consists of logic gates whose outputs at any time are determined from the present combination of inputs. A combinational circuit performs an operation that can be specified logically by a set of Boolean functions. A combinational circuit comprises of input variables, logic gates and output variables.

The Inverter
Operation:
When the input is LOW, The output is HIGH; when the input is HIGH, the output is LOW, thereby producing an inverted output pulse

The AND Gate
Operation:
For a 2-input AND gate, output Y is HIGH if both input A and B are HIGH; Y is LOW if either A or B is LOW, or both A and B are LOW.

The OR Gate

Operation:

For a 2-input OR gate, output Y is HIGH if either input A or B is HIGH, or if both A and B are HIGH; Y is LOW if both A and B are LOW.


The NAND gate

Operation:

For a 2-input NAND gate, output Y is LOW if input A and B are HIGH; Y is HIGH if either A or B are LOW, or if both A and B are LOW.


The NOR Gate

Operation:

For a 2-input NOR gate, output Y is LOW if either input A or B is HIGH, or if both A and B are HIGH; Y is HIGH if both A and B are LOW.
 
The XOR Gate

Operation:

For an exclusive-OR gate, output Y is HIGH if input A is LOW and input B is HIGH, or if input A is HIGH and input B is LOW; Y is LOW if A and B are both HIGH or both LOW.

The XNOR Gate

Operation:

For an exclusive-NOR gate, output Y is LOW if input A is LOW and input B is HIGH, or if input A is HIGH and input B is LOW; Y is HIGH if A and B are both HIGH or both LOW.

Terima kasih.. salam dari pantai timur.
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