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NE555 Datasheet(PDF) 7 Page - STMicroelectronics

Part No. NE555
Description  GENERAL PURPOSE SINGLE BIPOLAR TIMERS
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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t = 0.5 ms / div
OUTPUT VOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 1.0V/div
R1 = R2 = 4.8k
, C1= 0.1µF, R = 1k
L
Figure 14
C
(
µF)
10
1.0
0.1
0.01
0.001
0.1
1
10
100
1k
10k
f (Hz)
o
1MΩ
R
1
+
R2
=
10M
10
0kΩ
10
k
1kΩ
Figure 15 : Free Running Frequency versus R1,
R2 and C1
Figure 14 shows actual waveforms generatedin 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 ofoscillation is them :
f
=
1
T
=
1.44
(R1 + 2R2) C1
and may be easily found by figure 15.
The duty cycle is given by :
D
=
R2
R1 + 2R2
Output
3
48
7
5
1
R1
C1
2
6
R2
Control
Voltage
NE555
V
CC = 5 to 15V
0.01
µF
Figure 13
PULSE WIDTH MODULATOR
When the timer is connected in the monostable
mode and triggered with a continuous pulse train,
the output pulse width can be modulated by a signal
applied to pin 5. Figure 16 shows the circuit.
Trigger
Output
R
C
NE555
2
4
3
1
5
6
7
Modulation
Input
8
A
VCC
Figure 16 : Pulse Width Modulator.
NE555/SA555/SE555
7/10




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