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## NE555 Datasheet(PDF) 7 Page - Fairchild Semiconductor

 Part No. NE555 Description Single Timer Download 14 Pages Scroll/Zoom 100% Manufacturer FAIRCHILD [Fairchild Semiconductor] Direct Link http://www.fairchildsemi.com Logo

## NE555 Datasheet(HTML) 7 Page - Fairchild Semiconductor

 7 / 14 pageLM555/NE555/SA5557777The equivalent circuit for discharging capacitor C1, when timer output is low is, as follows:Since the duration of the timer output low state(tL) is the amount of time it takes for the VC1(t) to reach Vcc/3,Since RD is normally RB>>RD although related to the size of discharging Tr.,tL=0.693RBC1(10)Consequently, if the timer operates in astable, the period is the same with'T=tH+tL=0.693(RA+RB)C1+0.693RBC1=0.693(RA+2RB)C1' because the period is the sum of the charge time and dischargetime. And since frequency is the reciprocal of the period, the following applies.3. Frequency divider3. Frequency divider3. Frequency divider3. Frequency dividerBy adjusting the length of the timing cycle, the basic circuit of Figure 1 can be made to operate as a frequency divider. Figure8. illustrates a divide-by-three circuit that makes use of the fact that retriggering cannot occur during the timing cycle.VC1t()23---VCCV=CC123---e-tHRARB+()C1------------------------------------––=4()tHC1RARB+()In2 0.693 RARB+()C1==5()C1RBRDVC1(0-)=2Vcc/3C1dvC1dt--------------1RARB+-----------------------VC10=+6()VC1t()23---VCCe-tRARD+()C1-------------------------------------=7()13---VCC23---VCCe-tLRARD+()C1-------------------------------------=8()tLC1RBRD+()In2 0.693 RBRD+()C1==9()frequency,f1T---1.44RA2RB+()C1----------------------------------------==11()

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