MC14040B
http://onsemi.com
5
Figure 3. Timing Diagram
CLOCK
RESET
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
Q9
Q10
Q11
Q12
1 2 4 8 16 32 64 128 256 512 1024 2048 4096
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.
MC14040B
Figure 4. Time−Base Generator
Clock Q5
Q10
Q11
Q12
V
CC
13
12
10
9
1
2
4
5
8
1/2
14012B
6
1/6 of HC14A
≥20pF
1.0M
1.0 Pulse/Minute
Output
V
CC
120Vac
60Hz
NOTE: Ground MUST be isolated
by a transformer or
opto−isolator for safety
reasons.
1/2
14012B