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參數(shù)資料
| 型號： | LM555CM |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OSC MONO TIMING 8-SOP |
| 標準包裝： | 90 |
| 類型： | 555 型，計時器/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-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 管件 |
| 供應(yīng)商設(shè)備封裝： | 8-SOP |
| 安裝類型： | 表面貼裝 |
| 產(chǎn)品目錄頁面： | 1220 (CN2011-ZH PDF) |
| 其它名稱： | LM555CMFS |
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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| LM555CM NOPB | 制造商:National Semiconductor 功能描述:Standard Timer Single 8-Pin SOIC N Rail 制造商:National Semiconductor 功能描述:Standard Timer Single 8-Pin SOIC Rail |
| LM555CM | 制造商:Texas Instruments 功能描述:IC TIMER SMD SOIC8 555 |
| LM555CM/HALF | 制造商:Texas Instruments 功能描述:IC TIMER SMD SOIC8 555 |
| LM555CM/NOPB | 功能描述:計時器和支持產(chǎn)品 Timer RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| LM555CM/NOPB | 制造商:Texas Instruments 功能描述:Timer IC |
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