NA555, NE555, SA555, SE555
PRECISION TIMERS
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SLFS022F–SEPTEMBER 1973–REVISED JUNE 2006
APPLICATION INFORMATION (continued)
Frequency Divider
By adjusting the length of the timing cycle, the basic circuit of Figure 9 can be made to operate as a frequency
divider. Figure 17 shows a divide-by-three circuit that makes use of the fact that retriggering cannot occur during
the timing cycle.
V
CC
= 5 V
R
A
= 1250 Ω
C = 0.02 µF
See Figure 9
Input Voltage
Output Voltage
Capacitor Voltage
Time − 0.1 ms/div
Figure 17. Divide-by-Three Circuit Waveforms
12
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