NE555 データシートの表示（PDF） - STMicroelectronics

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NE555

General-purpose single bipolar timers

STMicroelectronics 

Application information

Figure 21. 50% duty cycle oscillator

VCC

4

2

8

7

NE555 6

NE555 - SA555 - SE555

RB

22kΩ

VCC

RA

51kΩ

Out

3

5 0.01μF

C

1

0.01μF

Note that this circuit will not oscillate if RB is greater than 1/2 RA because the junction of RA

and RB cannot bring pin 2 down to 1/3 VCC and trigger the lower comparator.

4.6

Additional information

Adequate power supply bypassing is necessary to protect associated circuitry. The

minimum recommended is 0.1 µF in parallel with 1 µF electrolytic.

14/20

Doc ID 2182 Rev 6

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