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参数资料
| 型号： | LMC555H/883 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟波形发生器 |
| 英文描述： | PULSE; RECTANGULAR, 3 MHz, TIMER, BCY8 |
| 封装： | METAL CAN, TO-99, 8 PIN |
| 文件页数： | 15/18页 |
| 文件大小： | 921K |
| 代理商： | LMC555H/883 |
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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