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NE555L-D08-T データシート(PDF) 6 Page - Unisonic Technologies

部品番号 NE555L-D08-T
部品情報  SINGLE TIMER
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メーカー  UTC [Unisonic Technologies]
ホームページ  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

NE555L-D08-T データシート(HTML) 6 Page - Unisonic Technologies

  NE555L-D08-T Datasheet HTML 1Page - Unisonic Technologies NE555L-D08-T Datasheet HTML 2Page - Unisonic Technologies NE555L-D08-T Datasheet HTML 3Page - Unisonic Technologies NE555L-D08-T Datasheet HTML 4Page - Unisonic Technologies NE555L-D08-T Datasheet HTML 5Page - Unisonic Technologies NE555L-D08-T Datasheet HTML 6Page - Unisonic Technologies NE555L-D08-T Datasheet HTML 7Page - Unisonic Technologies NE555L-D08-T Datasheet HTML 8Page - Unisonic Technologies  
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NE555
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
6 of 8
www.unisonic.com.tw
QW-R106-001,F
TYPICAL APPLICATION NOTES
The application circuit shows astable mode configuration.
Pin 6 (Threshold ) is tied to Pin 2 ( Trigger ) and Pin 4 ( reset ) is tied to VCC ( Pin 8 ). The external capacitor C1 of
Pin 6 and Pin 2 charges through RA, RB and dischages through RB only. In the internal circuit of UTC NE555 ,
one
input of the upper comparator is at voltage of
2/3Vcc(R1=R2=R3),another input
is
connected to Pin 6.As soon
as
C1 is charging to higher than 2/3Vcc, transistor Q1
is turned ON and discharge C1 to collector
voltage of
transistor Q1. Therefore, the flip-flop circuit is reset and output is low. One input of lower comparator is at voltage of
1/3Vcc, discharge transistor Q1 turn off and C1 charges through RA and RB. Therefore, the flip-flop circuit is set
output high.
That is, when C1 charges through RA and RB , output is high and when C1 discharge through RB ,output is low.
The charge time(output is high) t1 is 0.693(RA+RB) C1 and the discharge time (output is low) T2 is 0.693 RB*C1.
ln
Vcc
1
3
Vcc
Vcc
2
3
Vcc
0.693
=
T1=0.693*(RA+RB)*C1
Thus the total period time T is given by
T2=0.693*RB*C1
T=T1+T2=0.693(RA+2RB)*C1.
Then the frequency of astable mode is given by
C1
*
)
R
(R
1.44
T
1
f
B
A
2
+
=
=
The duty cycle is given by
B
A
B
2R
R
R
T
T2
D.C.
+
=
=
.


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