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LOGIC CIRCUITS

By penalysis  On September 25, 2016 In COMPUTER STUDIES Leave a comment 
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LOGIC GATES

There are three basic logic gates from which others can be made, namely:

(1)     The NOT GATE

(2)     The AND GATE

(3)     The OR GATE

THE NOT GATE

This gate negates the value of data or signal at its input. It will always output the opposite signal.

NOT GATE IMAGE

 

INPUT OUTPUT
A

0

1

B

1

0

Not gate truth table

THE AND GATE

This gate requires at least two data or signal lines and performs the AND Boolean operation on them to produce a single output.Thus, if both or all input are true, the output is true. Also, if any input A or B is false, then result C will be false.

AND GATE IMAGE

 

INPUT OUTPUT
A

0

0

1

1

B

0

1

0

1

C

0

0

0

1

AND gate truth table

THE OR GATE

This gate will produce a single output that is true for any of the input that is true.

OR GATE IMAGE

 

INPUT OUTPUT
A             B

0              0

0              1

1              0

1              1

C

0

1

1

1

Or gate truth table

THE NAND GATE

A logic gate that creates the function of the logical operator NAND. Also, it could be said to be a logical gate that produces an output that is the inverse of the output of an AND gate.

THE X OR GATE

It is a logic gate that carries out exclusive (total) disjunction (disconnection). It behaves according to the truth table to the right. A HIGH output (1) result if one and only one of the inputs to the gate is HIGH (1) if both inputs are LOW (0) or both are HIGH (1), a LOW output (0) results (e.g. (MOS4030).

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