Logic Gate
Who invented Logic Gate?
Walter Bothe inventor of coincidence circuit.
Coincidence circuit:
One output with two or more inputs.
How Gate works?
Requires electricity.
Time delay between an input being applied and output responding.
What is Logic Gate?
Performs basic logical functions and building block of digital circuit.
Two inputs and one output.
Digital Circuit:
Generates stores and processes data in terms of two states: Positive and Non Positive.
Positive is 1.
Non Positive is 0.
How many different types of logic gate are there?
AND, OR, NAND, NOR, XOR, XNOR, NOT.
For NOT gate requires only one input.
AND gate:
All or nothing gate.
Multiplication of inputs produce output.
Symbols of AND gate:
American or military.
European or rectangular.
DIN(Deutsches Institut fur Norming)
Applications of AND gate:
While going out of house if you set Alarm switch and if burglar enters he will set person switch Alarm ring.
OR gate:
Any or all gate.
Addition of inputs produce output.
Symbols of OR gate:
American.
European or rectangular gate.
DIN.
Applications of OR gate:
Door bell.
NOT gate:
Opposite of input.
Symbol:
Applications of NOT gate:
Central heating.
Universal gate:
NAND and NOR.
Why they are called Universal gates?
With NAND and NOR we can form AND, OR and NOT gates.
NAND gate:
Opposite to output of AND.
Symbols:
American.
European.
DIN.
NOR gate:
Opposite of output of OR.
Symbols:
American.
European.
DIN.
XOR gate:
Symbols:
Traditional.
IEEE.
XNOR gate:
Symbols:
