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LMC555CN PDF预览

LMC555CN

更新时间: 2024-01-23 10:13:21
品牌 Logo 应用领域
美国国家半导体 - NSC /
页数 文件大小 规格书
12页 321K
描述
CMOS Timer

LMC555CN 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Active零件包装代码:SOIC
包装说明:SOP, SOP8,.25针数:8
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01Factory Lead Time:6 weeks
风险等级:1.62模拟集成电路 - 其他类型:PULSE; RECTANGULAR
JESD-30 代码:R-PDSO-G8JESD-609代码:e3
长度:4.9 mm湿度敏感等级:1
功能数量:1端子数量:8
最高工作温度:125 °C最低工作温度:-40 °C
最大输出频率:3 GHz封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装等效代码:SOP8,.25
封装形状:RECTANGULAR封装形式:SMALL OUTLINE
峰值回流温度(摄氏度):260电源:1.5/12 V
认证状态:Not Qualified座面最大高度:1.75 mm
子类别:Analog Waveform Generation Functions最大供电电流 (Isup):0.4 mA
最大供电电压 (Vsup):12 V最小供电电压 (Vsup):1.5 V
标称供电电压 (Vsup):5 V表面贴装:YES
技术:CMOS温度等级:AUTOMOTIVE
端子面层:Matte Tin (Sn)端子形式:GULL WING
端子节距:1.27 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIED宽度:3.9 mm
Base Number Matches:1

LMC555CN 数据手册

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Application Info (Continued)  
DS008669-14  
=
V
5V  
Top Trace: Input 4V/Div.  
CC  
=
DS008669-12  
TIME 20 µs/Div. Middle Trace: Output 2V/Div.  
=
A
R
9.1 kΩ  
Bottom Trace: Capacitor 2V/Div.  
=
V
5V  
Top Trace: Output 5V/Div.  
Bottom Trace: Capacitor Voltage 1V/Div.  
CC  
=
C
0.01µF  
=
TIME 20 µs/Div.  
=
=
R
R
C
3.9kΩ  
9kΩ  
A
FIGURE 7. Frequency Divider Waveforms  
B
=
0.01µF  
PULSE WIDTH MODULATOR  
FIGURE 5. Astable Waveforms  
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  
Voltage Terminal. Figure 8 shows the circuit, and in Figure 9  
are some waveform examples.  
The charge time (output high) is given by  
=
t1 Ln2 (RA + RB)C  
And the discharge time (output low) by:  
=
t2 Ln2 (RB)C  
Thus the total period is:  
=
=
t1 + t2 Ln2 (RA + RB)C  
T
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:  
DS008669-20  
FIGURE 8. Pulse Width Modulator  
DS008669-13  
DS008669-15  
FIGURE 6. Free Running Frequency  
=
V
5V  
Top Trace: Modulation 1V/Div.  
CC  
=
TIME 0.2 ms/Div. Bottom Trace: Output Voltage 2V/Div.  
FREQUENCY DIVIDER  
=
R
C
9.1 kΩ  
A
=
0.01µF  
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.  
FIGURE 9. Pulse Width Modulator Waveforms  
PULSE POSITION MODULATOR  
This application uses the timer connected for astable opera-  
tion, as in Figure 10, with a modulating signal again applied  
to the control voltage terminal. The pulse position varies with  
www.national.com  
6

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