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LM555CM/NOPB Datasheet(PDF) 15 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
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LM555CM/NOPB Datasheet(HTML) 15 Page - Texas Instruments

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LM555
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SNAS548D – FEBRUARY 2000 – REVISED JANUARY 2015
9 Power Supply Recommendations
The LM555 requires a voltage supply within 4.5 V to 16 V. Adequate power supply bypassing is necessary to
protect associated circuitry. The minimum recommended capacitor value is 0.1
μF in parallel with a 1-μF
electrolytic capacitor. Place the bypass capacitors as close as possible to the LM555 and minimize the trace
length.
10 Layout
10.1 Layout Guidelines
Standard PCB rules apply to routing the LM555. The 0.1-µF capacitor in parallel with a 1-µF electrolytic capacitor
should be as close as possible to the LM555. The capacitor used for the time delay should also be placed as
close to the discharge pin. A ground plane on the bottom layer can be used to provide better noise immunity and
signal integrity.
Figure 20 is the basic layout for various applications.
C1 – based on time delay calculations
C2 – 0.01-µF bypass capacitor for control voltage pin
C3 – 0.1-µF bypass ceramic capacitor
C4 – 1-µF electrolytic bypass capacitor
R1 – based on time delay calculations
U1 – LMC555
10.2 Layout Example
Figure 20. Layout Example
Copyright © 2000–2015, Texas Instruments Incorporated
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