The Basic Of Logic Design(Logic Gates) By Muhammad Yusuf Bin Ahmad Shah Ruddeen

The Basic Of Logic Design(Logic Gates)

Do you know what is Logic Gates?

Logic gates is an elementry buliding block of digital circuit.Logic gates have 2 input and only 1 output.             Gates has 2 binary condition which is low(0) and high(1).

in Logic Gateshave 7 basic gates that is AND, OR, NOT, EXOR,NAND,NOR and EXNOR

AND GATES

The AND gate gives a high (1) output only if all its inputs are high.If the gates have a low input, the output must be a low(0) output. The operation for AND gates is dot(.), example

A.B=AB

AND Gates

OR GATES

OR gives a high output (1) if one or more of its inputs are high although have low(0) input.  The operation of OR gates is Plus(+).Example A+B=Y

OR Gates

NOT GATES

NOT gates is also known as inverter. NOT gates are produces an inverted of the input for  its output. The inverted input is called NOT input such input A called NOT A. Also can show or called A’ or A bar. For example if input A

NOT Gates

NAND GATES
NAND gates is combination of AND gates and NOT gates. First is AND gates and followed by NOT gates. The output for this gates is high(1) if one of the input are low(0). The difference between NAND gates and AND gates is the small circle on the output. Example A.B=(A.B)’.

NAND Gates

NOR  GATES

This NOR gates seems like NAND gates but in NAND gates use AND and NOT gate but in this gates use OR and NOT gates. Same goes with NAND gate, OR gates first and followed by NOT gates. The output for this gates are low(0) if  one of the input are high(1). The symbol for this gates small circle on the output. Example A+B=(A+B)’

NOR Gates

EXOR  GATES

This gates called Exclusive-OR gates which give output high(1) if have one high(1) input but not both its two input are high(1). This gates use  as a sign. Example A+B=AB

EXOR Gates

 EXNOR  GATES

This is Exclusive-NOR gates which is opposite with Exclusive-OR gates. It will give low(0) output if either, but not both their input are high(1). The small circle on the output side is the sign of the EXNOR gates. Example A+B=(A B)’

EXNOR Gates

All picture are drawn by myself 

BY Muhammad Yusuf Bin Ahmad Shah Ruddeen (B031210051)