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		B			Y
			0 0 1 1		0 1 0 1			0 0 0 1
OR			A		B			Y
			0 0 1 1		0 1 0 1			0 1 1 1
NOT			A			Y
			0 1			1 0
NAND			A		B			Y
			0 0 1 1		0 1 0 1			1 1 1 0
NOR			A	B			Y
			0 0 1 1	0 1 0 1			1 0 0 0
XOR			A	B			Y
			0 0 1 1	0 1 0 1			0 1 1 0
XNOR		or	A	B			Y
			0 0 1 1	0 1 0 1			1 0 0 1

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