M74HC4028
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 2, 3, 4, 5,
6, 7, 9, 14,
15
10, 11, 12,
13
8
16
SYMBOL
Y0 to Y9
NAME AND FUNCTION
Decoder Outputs
A to D
GND
V
CC
Data Inputs
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
D
L
L
L
L
L
L
L
L
H
H
H
H
C
L
L
L
L
H
H
H
H
L
L
X
H
B
L
L
H
H
L
L
H
H
L
L
H
X
A
L
H
L
H
L
H
L
H
L
H
X
X
Y0
H
L
L
L
L
L
L
L
L
L
L
L
Y1
L
H
L
L
L
L
L
L
L
L
L
L
Y2
L
L
H
L
L
L
L
L
L
L
L
L
Y3
L
L
L
H
L
L
L
L
L
L
L
L
OUTPUTS
Y4
L
L
L
L
H
L
L
L
L
L
L
L
Y5
L
L
L
L
L
H
L
L
L
L
L
L
Y6
L
L
L
L
L
L
H
L
L
L
L
L
Y7
L
L
L
L
L
L
L
H
L
L
L
L
Y8
L
L
L
L
L
L
L
L
H
L
L
L
Y9
L
L
L
L
L
L
L
L
L
H
L
L
SELECTED
OUTPUT
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
NONE
NONE
X : Don’t Care
LOGIC DIAGRAM
This logic diagram has not be used to estimate propagation delays
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