Decoder
4 to 16 (74LS154)
Decoder 4 to 16 ini digunakan untuk mengatur
LED yang ada pada
panel informasi di Modul Main-monitoring. Jumlah decoder yang digunakan
dalam sistem ini ada tiga, dengan demikian jumlah maksimum
LED yang dapat dinyalakan adalah 48 buah. Akan tetapi karena LED yang
digunakan akan menampilkan dua status atau lebih, maka sedikitnya akan dibutuhkan dua pin
pada decoder untuk mengatur nyala
dari LED yang digunakan. Dengan kondisi
seperti ini, maka total LED yang dapat dinyalakan dengan menggunakan
tiga decoder adalah 24 LED.
Koneksi Pin 74LS154
Tabel Fungsi IC 74LS154
Input
|
Output
|
||||||||||||||||||||
G1
|
G2
|
D
|
C
|
B
|
A
|
0
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
14
|
15
|
L
|
L
|
L
|
L
|
L
|
L
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
L
|
L
|
L
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
L
|
L
|
H
|
L
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
L
|
L
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
L
|
H
|
L
|
L
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
L
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
L
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
H
|
L
|
L
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
H
|
L
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
H
|
L
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
L
|
L
|
H
|
H
|
L
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
L
|
L
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
H
|
L
|
L
|
H
|
H
|
H
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
H
|
L
|
L
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
L
|
H
|
X
|
X
|
X
|
X
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
L
|
X
|
X
|
X
|
X
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
X
|
X
|
X
|
X
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|
H
|