MC14028BCP データシートの表示（PDF） - Motorola => Freescale
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MC14028BCP Datasheet PDF : 7 Pages
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LOGIC DIAGRAM
Q0
Q1
A
Q2
Q3
B
Q4
Q5
C
Q6
Q7
D
Q8
Q9
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.
INPUTS
D C BA
DC B A
MC14028B
Q9
Q0
DC B A
MC14028B
Q9
Q0
15
–8
15
–0
OUTPUT NUMBERS
Figure 2. Code Conversion Circuit and Truth Table
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
00 000000000000000001 0 0
00
00 010000000000000010 1 1
11
00 100000000000000100 2 3
022
00 110000000000001000 3 2 0 3 3
01 000000000000010000 4 7 1 4 4
01 010000000000100000 5 6 2
3
01 100000000001000000 6 4 3 1
4
01 110000000010000000 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
677
1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 14 11
888
1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15 10
799
MC14028B
116
MOTOROLA CMOS LOGIC DATA
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