Minggu, 09 September 2012

Gerbang Logika

Gerbang logika adalah dasar pembentuk dalam sistem digital yang gerbang logika tersebut beroperasi dalam bilangan biner atau logika biner ( 0 dan 1).
Pada sistem digital hanya terdapat tiga buah gerbang logika dasar, yakni :
    
1. Gerbang logika AND
2. Gerbang logika OR, dan
3. Gerbang logika NOT (inverter)

    Adapun gerbang logika bentukan, yakni terdiri dari
    1. NAND
    2. NOR
    3. XOR, dan
    4. XNOR

      Masing-masing gerbang logika dapat ditemui dalam suatu kemasan chip yang dikenal IC (Integrated Circuit).
      Mari kita lihat dibawah ini akan ditunjukan tabel kebenaran pada masing-masing gerbang logika.

      Logika AND
       A
      B
      Hasil
      0
      0
      0
      0
      1
      0
      1
      0
      0
      1
      1
      1
      Logika OR
      A
      B
      Hasil
      0
      0
      0
      0
      1
      1
      1
      0
      1
      1
      1
      1
         




      Logika NOT
      A
      Hasil
      1
      0
      0
      1







      Logika NAND
       A
      B
      Hasil
      0
      0
      1
      0
      1
      1
      1
      0
      1
      1
      1
      0
      Logika NOR
      A
      B
      Hasil
      0
      0
      1
      0
      1
      0
      1
      0
      0
      1
      1
      0

                                        






      Logika XOR
       A
      B
      Hasil
      0
      0
      0
      0
      1
      1
      1
      0
      1
      1
      1
      0
      Logika XNOR
      A
      B
      Hasil
      0
      0
      1
      0
      1
      0
      1
      0
      0
      1
      1
      1








      Berikutnya yuk lihat rangkaian internal beberapa IC, di antaranya IC : 7400,7403, 7437, 7408, 7409, 7432, dan 7402.








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