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| SA555DT Datasheet, PDF (14/20 Pages) STMicroelectronics – General-purpose single bipolar timers | |||
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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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