MC74HC4040ADT データシートの表示（PDF） - Motorola => Freescale
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MC74HC4040ADT Datasheet PDF : 8 Pages
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MC54/74HC4040A
Clock
Reset
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
12
4
8
16
32
64 128 256 512 1024 2048 4096
Figure 6. Timing Diagram
APPLICATIONS INFORMATION
Time–Base 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 squares–up the input waveform and
feeds the HC4040A. 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.
120Vac
60Hz
1.0M
≥20pF
VCC
1/6 of HC14A
VCC
HC4040A
13
Clock
Q5
12
Q10
10
Q11
9
Q12
1.0 Pulse/Minute
1
1/2
8 2 1/2 6
Output
HC20
4
5
HC20
Figure 7. Time–Base Generator
MOTOROLA
6
High–Speed CMOS Logic Data
DL129 — Rev 6
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