3. Logic gates and logic circuits

Oct 30, 2019

Chapter Overview

  • Different types of Logic Gate
    • NOT
    • OR
    • NOR
    • XOR (EOR)
    • AND
    • NAND
  • Pastpaper Question

3.1 Different types of Logic Gate

NOT GATE
An Inverter that only has one input, it reverses the logic state

0_1543115635879_500px-Not-gate-en.svg.png

Truth Table

AA‘
01
10

OR GATE
An OR gate can have two or more inputs. The output will be True if at least one input is true.

0_1543116353840_or-gate-hi.png

Truth Table

ABA + B
000
011
101
111

NOR GATE — An Universal logic gate
The reverse logic of OR gate

0_1543116132795_1200px-NOR_ANSI_Labelled.svg.png

Truth Table

AB(A + B)’
001
010
100
110

XOR(EOR) GATE
A circuit which will give a True output if either, but not both, of its two inputs, is True

0_1543116702596_800px-XOR_ANSI.svg.png

Truth Table

ABA ⊕ B
000
011
101
110

AND GATE
The output will be True when both inputs are true

0_1543116889343_and-gate-hi.png

Truth Table

ABA * B
000
010
100
111

NAND GATE — An Universal logic gate
The reverse logic of AND GATE

0_1543117062884_1920px-NAND_ANSI_Labelled.svg.png

Truth Table

AB(A * B)’
001
011
101
110

3.2 Practice Time

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0_1543117632987_Screen Shot 2018-11-25 at 11.46.24 AM.png
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