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LM555CM/NOPB Datasheet(PDF) 11 Page - Texas Instruments

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Part # LM555CM/NOPB
Description  Timer
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM555CM/NOPB Datasheet(HTML) 11 Page - Texas Instruments

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LM555
www.ti.com
SNAS548D – FEBRUARY 2000 – REVISED JANUARY 2015
Device Functional Modes (continued)
VCC = 5 V
Top Trace: Output 5V/Div.
TIME = 20
μs/DIV.
Bottom Trace: Capacitor Voltage 1V/Div.
RA = 3.9 kΩ
RB = 3 kΩ
C = 0.01
μF
Figure 15. Astable Waveforms
The charge time (output high) is given by:
t1 = 0.693 (RA + RB) C
(1)
And the discharge time (output low) by:
t2 = 0.693 (RB) C
(2)
Thus the total period is:
T = t1 + t2 = 0.693 (RA +2RB) C
(3)
The frequency of oscillation is:
(4)
Figure 16 may be used for quick determination of these RC values.
The duty cycle is:
(5)
Figure 16. Free Running Frequency
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