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NE555 Datasheet(PDF) 11 Page - STMicroelectronics

Part # NE555
Description  General purpose single bipolar timers
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

NE555 Datasheet(HTML) 11 Page - STMicroelectronics

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NE555 - SA555 - SE555
Application information
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Figure 15.
Typical schematics in astable operation
Figure 16 shows the actual waveforms generated in this mode of operation.
The charge time (output HIGH) is given by:
t1 = 0.693 (R1 + R2) C1
and the discharge time (output LOW) by:
t2 = 0.693 (R2) C1
Thus the total period T is given by:
T = t1 + t2 = 0.693 (R1 + 2R2) C1
The frequency of oscillation is then:
It can easily be found from Figure 17.
The duty cycle is given by:
Output
3
4
8
7
5
1
R1
C1
2
6
R2
Control
Voltage
NE555
V
CC = 5 to 15V
0.01
μF
f =
1
T
---
1.44
R1
2R2
+
()C1
---------------------------------------
=
D
R2
R1
2R2
+
--------------------------
=


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