11/11/2008
TEKNIK DIGITAL IV. GERBANG-GERBANG LOGIKA Anhar, ST, MT. Anhar.net63.net
OUTLINE
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Pengantar
Tabel kebenaran
Gerbang-gerbang Gerbang-gerbang logika
A n h a ,r S T , M T
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11/11/2008
PENGANTAR 1 1 / 1 1 / 2 0 0 8
Gerbang-gerbang logika adlh rangkaian elektronika yg digunakan utk mengaplikasikan persamaan logika dasar, spt pers Boolean. Gerbang logika merupakan blok yg paling dasar dr logika kombinasional. Ada 3 gerbang logika dasar :
A n h a ,r S T , M T
Gerbang OR Gerbang AND Gerbang NOT
Gerbang yg diturunkan dr gerbang diatas adlh :
Gerbang NAND Gerbang NOR Gerbang EX-OR Gerbang EX-NOR
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LOG OGIK IKA A PO POSI SITI TIF F DA DAN N NE NEGA GATI TIF F
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Bilangan biner dinyatakan dng 2 keadaan, logika 0 dan dan lo ika ika 1.
Logika ini dlm sistem peralatan digital mengacu pd 2 level tegangan/arus.
Bila lebih banyak positif dr 2 teg./arus 1
Bila lebih sedikit positif dr 2 teg./arus 0, atau sebaliknya.
Contoh :
A n h a ,r S T , M T
Bila 2 teg berlevel 0 V dan +5 V, maka dlm sistem logika positif, 0 V = logika 0, dan +5 V = logika 1. 4
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11/11/2008
T AB ABEL EL KEB KEBEN ENARA ARAN N
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Merupakan suatu tabel yg mencantumkan mencantumkan sem semua kemu kemun n kina kinan n in ut bine binerr dan dan out out ut berhubungan dr sistem logika.
Bila variabel input 1, maka ada 2 kemungkinan input, 0 atau 1.
Bila variabel input 2, maka ada 4 kemungkinan input, dst.
a a a n npu ner, ma a a e e enarannya n akan memiliki 2 kombinasi input, atau 2n baris.
A n h a ,r S T , M T
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Tabel kebenaran utk 2 dan 3 input.
A n h a ,r S T , M T
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11/11/2008
GER ERBA BANG NG LO LOGI GIKA KA 1. GER ERBA BANG NG OR
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Membentuk operasi OR dr 2 atau 3 gerbang masukan.
Dlm persamaan logika : Y = A + B
Gerbang OR 2 masukan :
A n h a ,r S T , M T
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Gerbang OR 3 dan 4 masukan :
A n h a ,r S T , M T
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11/11/2008
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Contoh 1 :
A n h a ,r S T , M T
masukan dng menggunakan gerbang OR 2masukan?
Penyelesaian :
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Contoh 2 : OR utk pulsa masukan spt gbr berikut ini.
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Penyelesaian :
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11/11/2008
GER ERBA BANG NG LO LOGI GIKA KA 2. GE GERB RBAN ANG G AN AND D
Output gerbang AND hanya bernilai 1 bila kedua masu suka kan n 1 sed sedan kan kan la lainn inn a 0. 0.
Dlm pers. Logika : Y = A. B
Gerbang AND 2 masukan :
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Gerbang AND 3 dan 4 masukan :
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11/11/2008
Contoh 3 : menggunakan gerbang AND 2 masukan.
Penyelesaian :
1 1 / 1 1 / 2 0 0 8 A n h a ,r S T , M T
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GER ERBA BANG NG LO LOGI GIKA KA 3. GE GERB RBAN ANG G NO NOT T
Merupakan rangkaian logika 1 output, dimana out out utn a sela selalu lu meru aka akan keba kebali lik kan dr in ut. ut. Dlm persamaan logika, bila inputnya X maka :
1 1 / 1 1 / 2 0 0 8 A n h a ,r S
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11/11/2008
Contoh 4 : Untuk rangkaian logika berikut, tentukan pulsa keluarannya.
Penyelesaian : Utk gbr (a), outputnya akan selalu 1 krn kedua inputnya tdk bisa sama2 0. Utk gbr (b), outputnya akan selalu 0 krn kedua inputnya tdk bisa sama2 1.
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GER ERBA BANG NG LO LOGI GIKA KA 4. GER GERBAN BANG G EXC EXCLUS LUSIVE IVE-OR
Gerbang Ex-OR bernilai 1 bila inputnya tdk sama sama dan dan ber berni nila laii 0 bil bila a in in utn utn a sam sama. a. Dlm pers logika : Y = A B =
A B + A B
Simbol rangk utk 2 masukan serta tabel
1 1 / 1 1 / 2 0 0 8 A n h a ,r S
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11/11/2008
Contoh 5 : 4 masukan dng menggunakan Ex-OR 2 masukan.
Penyelesaian :
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GER ERBA BANG NG LO LOGI GIKA KA 5. GE GERB RBAN ANG G NA NAND ND
Menyatakan NOT AND
AND Persamaan boolean :
1 1 / 1 1 / 2 0 0 8 A n h a ,r S
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11/11/2008
GER ERBA BANG NG LO LOGI GIKA KA 5. GE GERB RBAN ANG G NO NOR R
Menyatakan NOT OR
Persamaan boolean :
Diagram rangk dan tabel kebenaran
1 1 / 1 1 / 2 0 0 8 A n h a ,r S T , M T
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GER ERBA BANG NG LO LOGI GIKA KA 5. GE GERB RBAN ANG G EX-NOR
Menyatakan NOT OR Ex-OR Persamaan boolean :
1 1 / 1 1 / 2 0 0 8 A n h a ,r S
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11/11/2008
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Contoh 6 : implementasi implementasi berikut ini :
Gerbang NAND 4 input menggunakan gerbang AND 2 input dan 1 inverter.
Gerbang NAND 3 input menggunakan gerbang NAND 2 input
Rangkaian NOT menggunakan 2 input gerbang NAND
Rangkaian NOT menggunakan 2 input gerbang NOR
ang a an
mengguna an
np npu ger ang
A n h a ,r S T , M T
x-
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Penyelesaian :
1 1 / 1 1 / 2 0 0 8 A n h a ,r S
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11/11/2008
GER ERBA BANG NG LO LOGI GIKA KA 6. GER GERBAN BANG G PEN PENGH GHALA ALANG NG
Sebagai pembalik masukan sebelum melewati erban Contoh diagram rangkaian 4 input dng salah satu gerbang penghalang dan tabel kebenarannya.
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11/11/2008
LATIHAN 1.
Buat tabel kebenaran utk diagram rangkaian spt berikut ini.
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2.
Gambarkan implementasi logika Inverter dengan menggunakan (i) NAND 2 input, (ii) , , 2 input.
3.
Rancanglah gerbang NAND 8 masukan dng menggunakan gerbang AND 2 input dan gerbang NAND 2 input.
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