MC74HC4040 ONSEMI [ON Semiconductor], MC74HC4040 Datasheet - Page 6

• Manufacturer Part Number: MC74HC4040
• Description: 12-Stage Binary Ripple Counter
• Manufacturer: ONSEMI [ON Semiconductor]

Time–Base Generator
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
A 60Hz sinewave obtained through a 100 K resistor
110 Vac
Reset
Clock
Q10
Q12
Q11
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
15 – 30
Volts
100 K
1
20 pF
2
V CC
4
1/6 of HC14A
8
APPLICATIONS INFORMATION
Figure 7. Time–Base Generator
Figure 6. Timing Diagram
16
http://onsemi.com
MC74HC4040A
32
Clock
HC4040A
V CC
6
64
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.
Q10
Q11
Q12
Q5
128
13
12
10
9
256
HC20
1/2
512
8
1024
1
2
4
5
HC20
1/2
2048
6
4096
1.0 Pulse/Minute
Output