NE555DR 参数 Datasheet PDF下载

PRECISION TIMERS

SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006

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APPLICATION INFORMATION (continued)

Frequency Divider

By adjusting the length of the timing cycle, the basic circuit of

can be made to operate as a frequency

divider.

shows a divide-by-three circuit that makes use of the fact that retriggering cannot occur during

the timing cycle.

Voltage − 2 V/div

Figure 17. Divide-by-Three Circuit Waveforms

ÏÏÏÏÏ

= 5 V

= 1250 Ω

C = 0.02 µF

See Figure 9

Input Voltage

Output Voltage

Capacitor Voltage

Time − 0.1 ms/div

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