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LM555CMMX/NOPB Datasheet(PDF) 10 Page - Texas Instruments

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Part # LM555CMMX/NOPB
Description  Timer
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM555CMMX/NOPB Datasheet(HTML) 10 Page - Texas Instruments

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LM555
SNAS548D – FEBRUARY 2000 – REVISED JANUARY 2015
www.ti.com
Device Functional Modes (continued)
Figure 13 is a nomograph for easy determination of R, C values for various time delays.
Figure 13. Time Delay
7.4.2 Astable Operation
If the circuit is connected as shown in Figure 14 (pins 2 and 6 connected) it will trigger itself and free run as a
multivibrator. The external capacitor charges through RA + RB and discharges through RB. Thus the duty cycle
may be precisely set by the ratio of these two resistors.
Figure 14. Astable
In this mode of operation, the capacitor charges and discharges between 1/3 VCC and 2/3 VCC. As in the
triggered mode, the charge and discharge times, and therefore the frequency are independent of the supply
voltage.
Figure 15 shows the waveforms generated in this mode of operation.
10
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