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NE555D Datasheet(PDF) 10 Page - STMicroelectronics |
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NE555D Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 20 page Application information NE555 - SA555 - SE555 10/20 Figure 13. Waveforms in monostable operation Figure 14. Pulse duration versus R1C1 4.2 Astable operation When the circuit is connected as shown in Figure 15 (pin 2 and 6 connected) it triggers itself and free runs as a multi-vibrator. The external capacitor charges through R1 and R2 and discharges through R2 only. Thus the duty cycle can be set accurately by adjusting the ratio of these two resistors. In the astable mode of operation, C1 charges and discharges between 1/3 VCC and 2/3 VCC. As in the triggered mode, the charge and discharge times and, therefore, frequency are independent of the supply voltage. CAPACITOR VOLTAGE = 2.0V/div t = 0.1 ms / div INPUT = 2.0V/div OUTPUT VOLTAGE = 5.0V/div R1 = 9.1k Ω, C1 = 0.01μF, R = 1kΩ L C ( μF) 10 1.0 0.1 0.01 0.001 10 100 1.0 10 100 10 (t ) d μs μs ms ms ms s |
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