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LM555CN PDF预览

LM555CN

更新时间: 2024-02-25 20:58:19
品牌 Logo 应用领域
美国国家半导体 - NSC 模拟波形发生功能信号电路光电二极管
页数 文件大小 规格书
12页 392K
描述
Timer

LM555CN 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.13
Is Samacsys:N模拟集成电路 - 其他类型:PULSE; RECTANGULAR
JESD-30 代码:R-PDIP-T8JESD-609代码:e0
功能数量:1端子数量:8
最高工作温度:125 °C最低工作温度:-55 °C
封装主体材料:PLASTIC/EPOXY封装代码:DIP
封装等效代码:DIP8,.3封装形状:RECTANGULAR
封装形式:IN-LINE峰值回流温度(摄氏度):NOT SPECIFIED
电源:5/15 V认证状态:Not Qualified
子类别:Analog Waveform Generation Functions最大供电电流 (Isup):12 mA
最大供电电压 (Vsup):18 V最小供电电压 (Vsup):4.5 V
标称供电电压 (Vsup):15 V表面贴装:NO
技术:BIPOLAR温度等级:MILITARY
端子面层:Tin/Lead (Sn/Pb)端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIEDBase Number Matches:1

LM555CN 数据手册

 浏览型号LM555CN的Datasheet PDF文件第5页浏览型号LM555CN的Datasheet PDF文件第6页浏览型号LM555CN的Datasheet PDF文件第7页浏览型号LM555CN的Datasheet PDF文件第9页浏览型号LM555CN的Datasheet PDF文件第10页浏览型号LM555CN的Datasheet PDF文件第11页 
Applications Information (Continued)  
Figure 5 shows the waveforms generated in this mode of  
operation.  
DS007851-11  
V
= 5V  
Top Trace: Input 4V/Div.  
TIME = 20µs/DIV. Middle Trace: Output 2V/Div.  
= 9.1kBottom Trace: Capacitor 2V/Div.  
CC  
R
A
C = 0.01µF  
DS007851-9  
FIGURE 7. Frequency Divider  
V
= 5V  
Top Trace: Output 5V/Div.  
CC  
TIME = 20µs/DIV.  
Bottom Trace: Capacitor Voltage 1V/Div.  
R
R
= 3.9kΩ  
= 3kΩ  
A
PULSE WIDTH MODULATOR  
B
C = 0.01µF  
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 pin 5. Figure  
8 shows the circuit, and in Figure 9 are some waveform  
examples.  
FIGURE 5. Astable Waveforms  
The charge time (output high) is given by:  
t1 = 0.693 (RA + RB) C  
And the discharge time (output low) by:  
t2 = 0.693 (RB) C  
Thus the total period is:  
T = t1 + t2 = 0.693 (RA +2RB) C  
The frequency of oscillation is:  
Figure 6 may be used for quick determination of these RC  
values.  
The duty cycle is:  
DS007851-12  
FIGURE 8. Pulse Width Modulator  
DS007851-13  
V
= 5V  
Top Trace: Modulation 1V/Div.  
TIME = 0.2 ms/DIV. Bottom Trace: Output Voltage 2V/Div.  
= 9.1kΩ  
CC  
DS007851-10  
FIGURE 6. Free Running Frequency  
R
A
C = 0.01µF  
FREQUENCY DIVIDER  
FIGURE 9. Pulse Width Modulator  
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.  
www.national.com  
8

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