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LM555CM/NOPB Datasheet(PDF) 11 Page - Texas Instruments |
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LM555CM/NOPB Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 25 page  LM555 www.ti.com SNAS548D – FEBRUARY 2000 – REVISED JANUARY 2015 Device Functional Modes (continued) VCC = 5 V Top Trace: Output 5V/Div. TIME = 20 μs/DIV. Bottom Trace: Capacitor Voltage 1V/Div. RA = 3.9 kΩ RB = 3 kΩ C = 0.01 μF Figure 15. Astable Waveforms The charge time (output high) is given by: t1 = 0.693 (RA + RB) C (1) And the discharge time (output low) by: t2 = 0.693 (RB) C (2) Thus the total period is: T = t1 + t2 = 0.693 (RA +2RB) C (3) The frequency of oscillation is: (4) Figure 16 may be used for quick determination of these RC values. The duty cycle is: (5) Figure 16. Free Running Frequency Copyright © 2000–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM555 |
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