MC74HC4020ADR2 ONSEMI [ON Semiconductor], MC74HC4020ADR2 Datasheet - Page 6

• Manufacturer Part Number: MC74HC4020ADR2
• Description: 14-Stage Binary Ripple Counter
• Manufacturer: ONSEMI [ON Semiconductor]

Time–Base Generator
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
A 60Hz sinewave obtained through a 1.0 Megohm resistor
Reset
Clock
Q10
Q12
Q13
Q14
Q4
Q5
Q6
Q7
Q8
Q9
120Vac
60Hz
1
2
1.0M
20pF
4
V CC
8
1/6 of HC14A
16
APPLICATIONS INFORMATION
Figure 7. Time–Base Generator
Figure 6. Timing Diagram
32
http://onsemi.com
MC74HC4020A
Clock
64
HC4020A
V CC
6
128
Q10
Q11
Q12
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.
Q5
13
12
10
9
256
512
HC20
1/2
1024
8
2048
1
2
4
5
HC20
1/2
4096
6
1.0 Pulse/Minute
8192
Output
16384