MC14040 데이터 시트보기 (PDF) - ON Semiconductor
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MC14040 Datasheet PDF : 9 Pages
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CLOCK
RESET
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
12
4
MC14040B
8
16
32
64 128 256 512 1024 2048 4096
Figure 3. Timing Diagram
APPLICATIONS INFORMATION
TIME−BASE GENERATOR
A 60 Hz sinewave obtained through a 1.0 Megohm
resistor connected directly to a standard 120 Vac power line
is applied to the clock input of the MC14040B. By selecting
outputs Q5, Q10, Q11, and Q12 division by 3600 is
accomplished. The MC14012B decodes the counter
outputs, produces a single 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
NOTE:
Ground MUST be isolated
by a transformer or
opto−isolator for safety
reasons.
VCC
MC14040B
13
Clock
Q5
12
Q10
10
Q11
9
Q12
1/2
14012B
1
8 2 1/2
4 14012B
5
1.0 Pulse/Minute
6
Output
Figure 4. Time−Base Generator
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