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LM555CM/NOPB Datasheet(PDF) 10 Page - Texas Instruments |
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LM555CM/NOPB Datasheet(HTML) 10 Page - Texas Instruments |
10 / 25 page ![]() 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 Submit Documentation Feedback Copyright © 2000–2015, Texas Instruments Incorporated Product Folder Links: LM555 |
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