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MC74HC4040ADTR2 View Datasheet(PDF) - ON Semiconductor

Part Name
Description
View to exact match
MC74HC4040ADTR2
ON-Semiconductor
ON Semiconductor ON-Semiconductor
MC74HC4040ADTR2 Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
Clock
Reset
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
MC74HC4040A
12
4
8
16
32
64 128 256 512 1024 2048 4096
Figure 8. Timing Diagram
APPLICATIONS INFORMATION
Time−Base Generator
A 60Hz sinewave obtained through a 100 K resistor
connected to a 120 Vac power line through a step down
transformer 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
NOTE:
Ground MUST be isolated
by a transformer or
opto−isolator for safety
reasons.
VCC
HC4040A
13
Clock
Q5
12
Q10
10
Q11
9
Q12
1.0 Pulse/Minute
1
1/2
HC20
8
2
4
5
1/2
HC20
6
Output
Figure 9. Time−Base Generator
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