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LM555CMX Datasheet(PDF) 8 Page - Fairchild Semiconductor

Part # LM555CMX
Description  Single Timer
Download  13 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

LM555CMX Datasheet(HTML) 8 Page - Fairchild Semiconductor

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© 2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
LM555 Rev. 1.1.0
8
3. Frequency Divider
By adjusting the length of the timing cycle, the basic circuit of Figure 1 can be made to operate as a frequency divider.
Figure 9. illustrates a divide-by-three circuit that makes use of the fact that retriggering cannot occur during the timing
cycle.
4. Pulse Width Modulation
The timer output waveform may be changed by modulating the control voltage applied to the timer's pin 5 and chang-
ing the reference of the timer's internal comparators. Figure 10 illustrates the pulse width modulation circuit.
When the continuous trigger pulse train is applied in the monostable mode, the timer output width is modulated accord-
ing to the signal applied to the control terminal. Sine wave, as well as other waveforms, may be applied as a signal to
the control terminal. Figure 11 shows the example of pulse width modulation waveform.
Figure 9. Waveforms of Frequency Divider Operation
Figure 10. Circuit for Pulse Width Modulation
Figure 11. Waveforms of Pulse Width Modulation
8
4
7
1
2
3
5
6
CONT
GND
Vcc
DISCH
THRES
RESET
TRIG
OUT
+Vcc
Trigger
R
A
C
Output
Input


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