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NE555 Datasheet(PDF) 11 Page - STMicroelectronics |
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NE555 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 20 page NE555 - SA555 - SE555 Application information 11/20 Figure 15. Typical schematics in astable operation Figure 16 shows the actual waveforms generated in this mode of operation. The charge time (output HIGH) is given by: t1 = 0.693 (R1 + R2) C1 and the discharge time (output LOW) by: t2 = 0.693 (R2) C1 Thus the total period T is given by: T = t1 + t2 = 0.693 (R1 + 2R2) C1 The frequency of oscillation is then: It can easily be found from Figure 17. The duty cycle is given by: Output 3 4 8 7 5 1 R1 C1 2 6 R2 Control Voltage NE555 V CC = 5 to 15V 0.01 μF f = 1 T --- 1.44 R1 2R2 + ()C1 --------------------------------------- = D R2 R1 2R2 + -------------------------- = |
Similar Part No. - NE555_07 |
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Similar Description - NE555_07 |
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