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| 型號(hào)： | NE555N |
| 廠商： | Fairchild Semiconductor |
| 文件頁(yè)數(shù)： | 12/13頁(yè) |
| 文件大小： | 0K |
| 描述： | IC OSC MONO TIMING 8-DIP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | 555 型，計(jì)時(shí)器/振蕩器（單路） |
| 電源電壓： | 4.5 V ~ 16 V |
| 電流 - 電源： | 7.5mA |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 包裝： | 管件 |
| 供應(yīng)商設(shè)備封裝： | 8-DIP |
| 安裝類型： | 通孔 |
| 其它名稱： | NE555NFS |
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LM555
—
Single
T
imer
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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