a. judul : flip-flop jk b. c. 1. -...
TRANSCRIPT
1
A. Judul : FLIP-FLOP JK
B. Tujuan Kegiatan Belajar 15 :
Setelah mempraktekkan Topik ini, anda diharapkan dapat :
1) Mengetahui cara kerja rangkaian Flip-Flop J-K.
2) Merangkai rangkaian Flip-Flop J-K.
C. Dasar Teori Kegiatan Belajar 15
1. Flip-flop J-K
Kelemahan flip-flop S-R adalah munculnya output yang tidak dapat
didefinisikan ketika input S dan R tinggi untuk jenis NOR dan rendah untuk
jenis NAND.Untuk menanggulanginya muncul keadaan tersebut,maka
dikembangkan flip-flop J-K, flip-flop J-K dibangun untuk mengantisipasi
keadaan terlarang pada flip-flop S-R, dan rangaian ditunjukan pada gambar di
bawah ini.
Gambar 1.1 Logic diagram dan logic simbol IC 7476
Konfigurasi diatas telah dapat menghilangkan keadaan terlarang yang terjadi
pada flip-flop S-R.Penggunaan flip-flop J-K dapat menimbulkan masalah
apabila sinyal input J dan K diberikan bersamaan dengan sinyal clock
pemicu.Misal flip-flop J-K dioperasikan dalam keadaan set,sehingga input
diberikan keadaan tinggi ( J = 1) dan inpu K diberikan keadaan rendah
(K=0).Perlu dikemukakan terlebih dahulu bahwa pada umumnya sinyal-sinyal
pemicu flip-flop termasuk sinyal input ketika diumpankan ke input-input flip-
flop tidak langsung bernilai tinggi,namun memerlukan waktu tertentu atau
mengalami penundaan dalam mencapai keadaan stabil.
2
2. KARAKTERISTIK IC TTL
+5V
4KΩ
Ke Rangkaian selanjutnya
Ke Rangkaian selanjutnya
I
E
B
C
Gambar 1.3 Rangkaian ekivalen input IC TTL ( Input = 0 )
Bila masukkan IC TTL dihubungkan ground maka ada beda potensial
antara basis dan emitter, sehingga arus mengalir menuju emitter, tidak ada arus
yang mengalir menuju colector. Input IC TTL sama dengan nol.
+5V
4KΩ
+5V
I
Ke Rangkaian selanjutnya
Ke Rangkaian selanjutnyaE
B
C
Gambar 1.4 Rangkaian ekivalen input IC TTL ( Input = 1 )
Bila masukan IC TTL dihubungkan dengan +5V, maka tidak ada beda
potensial antara basis dan emiter Tr1. Sehingga arus mengalir menuju colector
Tr1 dan menuju basis Tr2, tidak ada arus yang mengalir menuju emiter. Input IC
TTL sama dengan 1.
3
+5V
4KΩ
Mengambang
I
Ke Rangkaian selanjutnyaE
B
C
Ke Rangkaian selanjutnya
Gambar 1.5 Rangkaian ekivalen input IC TTL ( Input = 1 )
Bila masukan IC TTL tidak dihubungkan dengan +5V atau ground (
mengambang ), maka tidak ada beda potensial antara basis dan emiter Tr1.
Sehingga arus mengalir menuju colector Tr1 dan menuju basis Tr2, tidak ada arus
yang mengalir menuju emiter. Input IC TTL sama dengan 1.
D. Lembar Praktikum
1. Alat dan Bahan
Modul trainer Flip-Flop J-K 1 buah
Catu daya 1 buah
Saklar input logika 1 buah
Kabel jumper kuning 4 buah
Kabel jumper merah 2 buah
2. Kesehatan dan Keselamatan kerja
(a) Periksalah komponen modul trainer sebelum digunakan.
(b) Pelajari dan pahami petunjuk praktikum pada lembar kegiatan
praktikum.
(c) Pastikan tegangan keluaran catu daya sesuai yang dibutuhkan.
(d) Sebelum catu daya dihidupkan hubungi dosen pendamping untuk
mengecek kebenaran rangkaian.
(e) Yakinkan tempat anda aman dari sengatan listrik.
(f) Hati-hati dalam penggunaan peralatan praktikum !
4
3. Langkah percobaan 2
a) Perhatikan gambar 1.2 lalu cermati konektor yang ada pada modul
Flip-Flop J-K.
10K
47pf
J
K
Q
Q
SD
CD
CLK1
4
16
15
14
2
3
7476
VCC +5V
330 Ω
Y1
330 Ω
Gambar 1.2 Rangkaian percobaan Flip-Flop J-K
b) Berilah modul Flip-Flop J-K tegangan sebesar 5VDC dengan cara
menghubungkan vcc dan ground power supply ke vcc dan ground
modul Flip-Flop J-K menggunakan kabel penghubung yang sudah
disediakan.
c) Berilah saklar input logika dengan tegangan 5VDC dengan
mnghubungkan ground dan vcc power supply pada pin paling atas
sesuai gambar.
d) Hubungkan kaki-kaki input J, K, SD, CD dengan Vcc atau ground
sesuai dengan kombinasi pada tabel 1.1.
e) Hubungkan kaki-kaki output Q dan Q dengan LED seperti pada
gambar 1.3.
f) Catat kondisi nyala lampu led yang terhubung dengan Q dan Q pada
tabel 1.1
5
+ 5V
BOOST CONVERTERFF-JK DAN FF-D
10K
10K
+ 5V
+ 5V
GND
GND
47pf
47pf
220
330
330
220
J
K
Q
Q
SD
CD
CLK1
4
16
15
14
2
3
D Q
Q
SD
CD
CLK3
2 5
6
4
1
FF-D
FF-JK
+ 5V
7474
7476
Gambar 1.3 modul Flip-Flop J-K
6
E. HASIL PRAKTIKUM
Tabel 1.1 Tabel Hasil Percobaan
INPUT OUTPUT
CLOCK SD CD J K Q Q NOT
0 1 X X
1 0 X X
0 0 X X
1 1 1 1
1 1 0 1
1 1 1 0
1 1 0 0
Keterangan :
Led menyala = 1 Logika 1 = vcc (5V ) X= tidak di hiraukan
Led mati = 0 Logika 0 = ground
7
F. GAMBAR PRAKTIKUM
8
9
10
Analisa
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
Kesimpulan
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
11
G. GAMBAR SIMULASI SOFTWARE (PRAKTIKUM)
12
13
14
Analisa
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
Kesimpulan
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
15
4. Tugas :
a. Bagaimana cara membuat keadaan set dan reset pada flip-flop J-K ?
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
........................................................................................................................
b. Buat rangkaian Flip-flop menggunakan gerbang NAND 3 masukan dan
gerbang NAND 2 masukan (simulasikan) !
Tabel Kebenaran
Clock J K Q Qnot
1 0 0
1 0 1
1 1 0
1 1 1
Gambar Simulasi Software (TUGAS)
16
17
Analisa
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
Kesimpulan
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
Daftar Pustaka
....................................................................................................................................
....................................................................................................................................
....................................................................................................................................
18