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NE556 Datasheet(PDF) 5 Page - STMicroelectronics

Part No. NE556
Description  GENERAL PURPOSE DUAL BIPOLAR TIMERS
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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 5 page
background image
NE556-SA556-SE556
5/8
Figure 7 : High Output Voltage Drop versus
Output
Figure 8 : Delay Time versus Supply Voltage
Figure 9 : Propagation Delay versus Voltage
Level of Trigger Value
TYPICAL APPLICATION
50% DUTY CYCLE OSCILLATOR
t1 = 0.693 RA.C
PULSE WIDTH MODULATOR
Output
R
C
1/2
NE556
SE556
6
4
5
7
3
2
1
14
A
(8)
(10)
(9)
(11)
(12)
VCC
51kW
(13)
22kW
Rs
0.01nF
t2 = [(RARB)/(RA+RB)]CLn
RB
2
RA
2
RB
RA
---------------------------
f =
t1
t1
t2
+
-----------------
RB <
1
2
--- RA ti
t2
t1
Output
R
C
1/2
NE556
SE556
6
4
5
7
3
2
1
14
A
(8)
(10)
(9)
(11)
(12)
VCC
(13)
Trigger
MODULATION
INPUT




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