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## NE555 Fiches technique(PDF) 7 Page - Fairchild Semiconductor

 No de pièce NE555 Description Single Timer Download 14 Pages Scroll/Zoom 100% Fabricant FAIRCHILD [Fairchild Semiconductor] Site Internet http://www.fairchildsemi.com Logo

## NE555 Fiches technique(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()

## Numéro de pièce similaire - NE555

 Fabricant No de pièce Fiches technique Description NXP Semiconductors NE555 120Kb / 7P Timer August 31, 1994 Diodes Incorporated NE555 729Kb / 14P PRECISION TIMERS NE555 674Kb / 14P Timing from microseconds to hours February 2021 Wing Shing Computer Com... NE555 273Kb / 5P Precision Timer Unisonic Technologies NE555 205Kb / 8P SINGLE TIMER
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## Description similaire - NE555

 Fabricant No de pièce Fiches technique Description Unisonic Technologies NE555 205Kb / 8P SINGLE TIMER GTM CORPORATION GPNE555 499Kb / 5P SINGLE TIMER GSCNE555 519Kb / 5P SINGLE TIMER Fairchild Semiconductor KA555IDTF 156Kb / 14P Single Timer KA555I 156Kb / 14P Single Timer LM555 194Kb / 13P Single Timer KA555 148Kb / 14P Single Timer KA555DTF 156Kb / 14P Single Timer SeCoS Halbleitertechnol... SSCNE555 777Kb / 5P Single Timer Unisonic Technologies C555 208Kb / 4P SINGLE TIMER C555 167Kb / 4P SINGLE TIMER
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