參數(shù)資料
型號(hào): MC14028B
廠商: Motorola, Inc.
英文描述: BCD-To-Decimal Decoder Binary-To-Octal Decoder
中文描述: BCD碼到十進(jìn)制解碼器二進(jìn)制到八通道解碼器
文件頁(yè)數(shù): 4/7頁(yè)
文件大小: 254K
代理商: MC14028B
MOTOROLA CMOS LOGIC DATA
MC14028B
116
LOGIC DIAGRAM
Q9
Q8
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
D
C
B
A
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 hexadeci-
mal 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 in-
verters.
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
C
B
A
D
C
B
A
D
C
B
A
MC14028B
Q9
Q0
Q9
Q0
15
–8
15
–0
OUTPUT NUMBERS
Inputs
Output Numbers
Code and Redefined
Output Numbers
Hexadecimal
Decimal
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
1
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
0
0
1
2
3
0
1
3
2
0
1
2
3
0
1
2
0
3
0
0
0
0
0
1
1
1
1
0
0
1
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
5
6
7
7
6
4
5
1
2
3
4
4
4
3
4
1
2
1
1
1
1
0
0
0
0
0
0
1
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
8
9
10
11
15
14
12
13
5
6
7
8
5
6
9
5
1
1
1
1
1
1
1
1
0
0
1
1
0
1
0
1
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
12
13
14
15
8
9
11
10
9
5
6
8
7
6
7
8
9
7
8
9
4
B
4
G
E
E
G
A
4
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