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SE555 Datasheet(PDF) 15 Page - STMicroelectronics

Part # SE555
Description  General purpose single bipolar timers
PDF  20 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SE555 Datasheet(HTML) 15 Page - STMicroelectronics

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NE555 - SA555 - SE555
Application information
15/20
Figure 21.
50% duty cycle oscillator
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 by passing is necessary to protect associated circuitry. The
minimum recommended is 0.1µF in parallel with 1µF electrolytic.
Out
RA
C
NE55
2
4
3
1
5
6
7
8
VCC
51k
Ω
RB
22k
Ω
0.01
μF
VCC
0.01
μF



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