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LM555J/883 Datasheet(PDF) 9 Page - Texas Instruments

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Part # LM555J/883
Description  LM555QML Timer
PDF  21 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM555J/883 Datasheet(HTML) 9 Page - Texas Instruments

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LM555QML
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SNOSAP2C – AUGUST 2005 – REVISED APRIL 2013
VCC = 5V
Top Trace: Output 5V/Div.
TIME = 20
μs/DIV.
Bottom Trace: Capacitor Voltage 1V/Div.
RA = 3.9kΩ
RB = 3kΩ
C = 0.01
μF
Figure 17. 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 18 may be used for quick determination of these RC values.
The duty cycle is:
(5)
Figure 18. Free Running Frequency
Copyright © 2005–2013, Texas Instruments Incorporated
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Product Folder Links: LM555QML



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