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MC74HC4020A
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8
Clock
Reset
Q4
1
2
4
8
16
32
64
128
256
512
1024
2048
4096
8192
16384
Q5
Q6
Q7
Q8
Q9
Q10
Q12
Q13
Q14
Figure 8. Timing Diagram
APPLICATIONS INFORMATION
TimeBase Generator
A 60Hz sinewave obtained through a 1.0 Megohm resistor
connected directly to a standard 120 Vac power line is
applied to the input of the MC54/74HC14A, Schmitt-trigger
inverter. The HC14A squaresup the input waveform and
feeds the HC4020A. Selecting outputs Q5, Q10, Q11, and
Q12 causes a reset every 3600 clocks. The HC20 decodes the
counter outputs, produces a single (narrow) output pulse,
and resets the binary counter. The resulting output frequency
is 1.0 pulse/minute.
HC4020A
Figure 9. TimeBase Generator
Clock
Q5
Q10
Q11
Q12
VCC
13
12
10
9
1
2
4
5
8
1/2
HC20
1/2
HC20
6
1/6 of HC14A
≥20pF
1.0M
1.0 Pulse/Minute
Output
VCC
120Vac
60Hz
NOTE: Ground MUST be isolated
by a transformer or
optoisolator for safety
reasons.
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