MC14028BCPG View Datasheet(PDF) - ON Semiconductor
Part Name
Description
Manufacturer
MC14028BCPG Datasheet PDF : 7 Pages
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Inputs B, C, and D switching
in respect to a BCD code.
20 ns
INPUT A
10%
MC14028B
90%
50%
20 ns
1/f
VDD
All outputs connected to respective
CL loads. f in respect to a system clock.
VSS
Inputs A, B, and D low.
INPUT C
10%
tPLH
20 ns
90%
50%
Q4 10%
90%
tTLH
20 ns
VDD
VSS
tPHL
VOH
50%
VOL
tTHL
Figure 1. Dynamic Signal Waveforms
Q0
Q1
A
Q2
Q3
B
Q4
Q5
C
Q6
Q7
D
Q8
Q9
LOGIC DIAGRAM
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.
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
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4
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