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LM555CM/NOPB Datasheet(PDF) 12 Page - Texas Instruments

 Part # LM555CM/NOPB Description Timer Download 25 Pages Scroll/Zoom 100% Manufacturer TI1 [Texas Instruments] Direct Link http://www.ti.com Logo

LM555CM/NOPB Datasheet(HTML) 12 Page - Texas Instruments

 12 / 25 pageLM555SNAS548D – FEBRUARY 2000 – REVISED JANUARY 2015www.ti.com8 Application and ImplementationNOTEInformation in the following applications sections is not part of the TI componentspecification, and TI does not warrant its accuracy or completeness. TI’s customers areresponsible for determining suitability of components for their purposes. Customers shouldvalidate and test their design implementation to confirm system functionality.8.1 Application InformationThe LM555 timer can be used a various configurations, but the most commonly used configuration is inmonostable mode. A typical application for the LM555 timer in monostable mode is to turn on an LED for aspecific time duration. A pushbutton is used as the trigger to output a high pulse when trigger pin is pulsed low.This simple application can be modified to fit any application requirement.8.2 Typical ApplicationFigure 17 shows the schematic of the LM555 that flashes an LED in monostable mode.Figure 17. Schematic of Monostable Mode to Flash an LED8.2.1 Design RequirementsThe main design requirement for this application requires calculating the duration of time for which the outputstays high. The duration of time is dependent on the R and C values (as shown in Figure 17) and can becalculated by:t = 1.1 × R × C seconds(6)8.2.2 Detailed Design ProcedureTo allow the LED to flash on for a noticeable amount of time, a 5 second time delay was chosen for thisapplication. By using Equation 6, RC equals 4.545. If R is selected as 100 kΩ, C = 45.4 µF. The values of R =100 kΩ and C = 47 µF was selected based on standard values of resistors and capacitors. A momentary pushbutton switch connected to ground is connected to the trigger input with a 10-K current limiting resistor pullup tothe supply voltage. When the push button is pressed, the trigger pin goes to GND. An LED is connected to theoutput pin with a current limiting resistor in series from the output of the LM555 to GND. The reset pin is not usedand was connected to the supply voltage.8.2.2.1 Frequency DividerThe monostable circuit of Figure 11 can be used as a frequency divider by adjusting the length of the timingcycle. Figure 18 shows the waveforms generated in a divide by three circuit.12Submit Documentation FeedbackCopyright © 2000–2015, Texas Instruments IncorporatedProduct Folder Links: LM555

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