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Digital Logic : Logic Gate (EASY)



DIGITAL LOGIC

1.      What is ‘Digital Logic’?
·         basis in digital computing
·         gives us an understanding how circuits and hardware communicate within the computer
·         use a sequence of numbers to represent the signal
-          basically use binary numbers (0 or 1)


LOGIC GATES

1.      What is ‘Logic Gates’?
·         a device that will perform a basic logical functions
·         fundemental to build a block of intergrated circuits
·         2 input
-          binary numbers (0 or 1)
·         some application of logic gate
-          diode
-          transistor
-          microprocessor etc.
·         can be represent by using Boolean expressions



Name
Graphical symbol
Algebraic Expressions
Truth Table
AND




A \cdot B
A
B
Y
0
0
1
1
0
1
0
1
0
0
0
1
OR




A+B
A
B
Y
0
0
1
1
0
1
0
1
0
1
1
1
NOT








\overline{A}
A
Y
0
1
1
0
NAND




\overline{A \cdot B}
A
B
Y
0
0
1
1
0
1
0
1
1
1
1
0
NOR




\overline{A + B}
A
B
Y
0
0
1
1
0
1
0
1
1
0
0
0
XOR
 



A \oplus B
A
B
Y
0
0
1
1
0
1
0
1
0
1
1
0
XNOR



\overline{A \oplus B} 
or
 {A \odot B}
A
B
Y
0
0
1
1
0
1
0
1
1
0
0
1





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