Logic Gates

The logic gates is basic building blocks of electronics logic circuits for large circuit its is more complex and no of logic gates is increase. These logic gates perform a basic Boolean functions , such as AND, OR, NAND, NOR, Inversion, Exclusive-OR, Exclusive-NOR. Boolean function, and truth. It is seen from the Fig that each gate has one or two binary inputs, A and B, and one binary output, C.

The different types of logic gates are:

  1. NOT GATE
  2. AND GATE
  3. OR GATE
  4. NAND GATE
  5. XOR GATE
  6. NOR GATE
  7. XNOR GATE

NOT Gate

The inverter is a logic gate which has only one input & one output. In inverter is Always opposite of input.
which means if set input LOW is output HIGH.if set input HIGH is output is LOW. the output is given below.

TRUTH TABLE
INPUTOUTPUT
XX = XDIAGRAM
01

NOT_GATE
NOT_GATE
10

AND Gate

AND gate is a logic gate Which can have two or more inputs.But there is only one output.
The output of AND gate is high only if all inputs are HIGH .
Even if one input is LOW the output is LOW. the output is given below.

TRUTH TABLE
INPUTOUTPUT
ABX = A . BDIAGRAM
000

AND_GATE
AND_GATE
010
100
111

OR Gate

OR gate is a logic gate Which can have two or more inputs.But there is only one output.
The output of OR gate is HIGH only if a one of the inputs are HIGH Even if one input is LOW, the output will HIGH. Only when both of input is zero the output will also LOW. the output is given below.

TRUTH TABLE
INPUTOUTPUT
ABX = A + BDIAGRAM
000

OR_GATE
OR_GATE
011
101
111

NAND Gate

NAND gate is a logic gate Which can have two or more inputs.But there is only one output.
NAND is Compliment of AND .The output of NAND gate is HIGH only if one inputs are HIGH or both input being LOW.if both input is HIGH the output is LOW, the output is given below.

 

TRUTH TABLE
INPUTOUTPUT
ABX = A . BDIAGRAM
001

NAND_GATE
NAND_GATE
011
101
110

XOR Gate

XOR gate is a logic gate Which can have two or more inputs.But there is only one output.
The output of XOR gate is HIGH only if one of the inputs are HIGH.
if both input is same the output is LOW, the output will below.

TRUTH TABLE
INPUTOUTPUT
ABX = A ⊕ BDIAGRAM
000

XOR_GATE
XOR_GATE
011
101
110

NOR Gate

NOR gate is a logic gate Which can have two or more inputs.But there is only one output.
NOR Gate is Compliment of OR. The output of NOR gate is HIGH only if both inputs are LOW.if Any input is HIGH the output is LOW, the output is given below.

TRUTH TABLE
INPUTOUTPUT
ABX = A + BDIAGRAM
001

NOR_GATE
NOR_GATE
010
100
110

XNOR Gate

XNOR gate is a logic gate. Which can have two or more inputs.But there is only one output.
XNOR Is Compliment of XOR . The output of NAND gate is HIGH only if Both inputs are same.
if both input is different the output is LOW, the output will below.

TRUTH TABLE
INPUTOUTPUT
ABX = A ⊕ BDIAGRAM
001

XNOR_GATE
XNOR_GATE
010
100
111

See Also in To Study and Verify the Truth Table of Logic Gates.

Designing and Simulating Digital Logic Circuits

Basic Logic Gates with Truth Table

DOWNLOAD LOGISIM

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Basic Logic Gates with Truth Table

Arvind Ahir

Im Arvind Ahir Student Study Btech CSE , Skills Web Developer,Networking ,Arduino .

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