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參數(shù)資料
| 型號： | LMC555CBP/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬波形發(fā)生器 |
| 英文描述： | PULSE; RECTANGULAR, 3 MHz, TIMER, PBGA8 |
| 封裝： | ROHS COMPLIANT, MO-211BC, SMD-8 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 921K |
| 代理商： | LMC555CBP/NOPB |
Application Information (Continued)
The charge time (output high) is given by
t
1 = 0.693 (RA +RB)C
And the discharge time (output low) by:
t
2 = 0.693 (RB)C
Thus the total period is:
T= t
1 +t2 = 0.693 (RA +RB)C
The frequency of oscillation is:
Figure 6 may be used for quick determination of these RC
Values. The duty cycle, as a fraction of total period that the
output is low, is:
FREQUENCY DIVIDER
The monostable circuit of Figure 1 can be used as a fre-
quency divider by adjusting the length of the timing cycle.
Figure 7 shows the waveforms generated in a divide by three
circuit.
PULSE WIDTH MODULATOR
When the timer is connected in the monostable mode and
triggered with a continuous pulse train, the output pulse
width can be modulated by a signal applied to the Control
are some waveform examples.
00866912
VCC = 5V
Top Trace: Output 5 V/Div.
TIME = 20 s/Div.
Bottom Trace: Capacitor Voltage 1 V/Div.
RA = 3.9 k
RB =9k
C = 0.01 F
FIGURE 5. Astable Waveforms
00866913
FIGURE 6. Free Running Frequency
00866914
VCC = 5V
Top Trace: Input 4 V/Div.
TIME = 20 s/Div.
Middle Trace: Output 2 V/Div.
RA = 9.1 k
Bottom Trace: Capacitor 2 V/Div.
C = 0.01 F
FIGURE 7. Frequency Divider Waveforms
00866920
FIGURE 8. Pulse Width Modulator
LMC555
www.national.com
6
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMC555CBPX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LMC555CBPX/NOPB | 功能描述:IC OSC MONO TMING 3MHZ 8MICROSMD RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 可編程計時器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補償晶體振蕩器（TCXO） 計數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
| LMC555CH | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:CMOS Timer(86.50 k) |
| LMC555CM | 功能描述:計時器和支持產(chǎn)品 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 |
| LMC555CM NOPB | 制造商:National Semiconductor 功能描述:Standard Timer Single 8-Pin SOIC N Rail |
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