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MC14028B Datasheet(PDF) 5 Page - ON Semiconductor

Part No. MC14028B
Description  BCD-To-Decimal Decoder Binary-To-Octal Decoder
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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MC14028B Datasheet(HTML) 5 Page - ON Semiconductor

   
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MC14028B
http://onsemi.com
5
APPLICATIONS INFORMATION
Expanded decoding can be performed by using the
MC14028B and other CMOS Integrated Circuits. The
circuit in Figure 2 converts any 4–bit code to a decimal or
hexadecimal code. The accompanying table shows the input
binary combinations, the associated “output numbers” that
go “high” when selected, and the “redefined output
numbers” needed for the proper code. For example: For the
combination DCBA = 0111 the output number 7 is redefined
for the 4–bit binary, 4–bit gray, excess–3, or excess–3 gray
codes as 7, 5, 4, or 2, respectively. Figure 3 shows a 6–bit
binary 1–of–64 decoder using nine MC14028B circuits and
two MC14069UB inverters.
The MC14028B can be used in decimal digit displays,
such as, neon readouts or incandescent projection indicators
as shown in Figure 4.
Figure 2. Code Conversion Circuit and Truth Table
INPUTS
D
MC14028B
CB
A
DC
B
A
D
C
B
A
MC14028B
Q9
Q0
Q9
Q0
15
– 8
15
– 0
OUTPUT NUMBERS
Code and Redefined
Output Numbers
Hexadecimal
Decimal
Inputs
Output Numbers
D
C
B
A
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
1
1
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
2
3
0
2
2
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
3
2
0
3
3
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
4
7
1
4
4
0
1
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
5
6
2
3
0
1
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
6
4
3
1
4
0
1
1
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
7
5
4
2
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
8
15
5
1
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
9
14
6
5
1
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
10
12
7
9
6
1
0
1
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
11
13
8
5
1
1
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
12
8
9
5
6
1
1
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
13
9
6
7
7
1
1
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
14
11
8
8
8
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
10
7
9
9


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