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KA555I データシート(PDF) 7 Page - Fairchild Semiconductor

部品番号 KA555I
部品情報  Single Timer
Download  14 Pages
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA555I データシート(HTML) 7 Page - Fairchild Semiconductor

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KA555
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The equivalent circuit for discharging capacitor C1, when timer output is low, is as follows:
Since the duration of the timer output low state(
tL) is the amount of time it takes for the VC1(t) to reach Vcc/3,
Since RD is normally RB >> RD although related to the size of discharging Tr.,
tL=0.693RBC1
(10)
Consequently, if the timer operates in astable, the period is the same with
'T=tH+tL=0.693(RA+RB)C1+0.693RBC1=0.693(RA+2RB)C1' because the period is the sum of the charge time and discharge
time. And since frequency is the reciprocal of the period, the following applies
.
3. Frequency divider
3. Frequency divider
3. Frequency divider
3. Frequency divider
By adjusting the length of the timing cycle, the basic circuit of Figure 1 can be made to operate as a frequency divider. Figure
8. illustrates a divide-by-three circuit that makes use of the fact that retriggering cannot occur during the timing cycle.
V
C1
t
()
2
3
−−V
CC
V
CC
1
2
3
−−e
-
t
H
R
A
R
B
+
()C1
−−−−−−−−−−−−−−−−−−−−−−






==
4
()
t
H
C
1
R
A
R
B
+
()In2
0.693 R
A
R
B
+
()C
1
==
5
()
C1
R
B
R
D
V
C1(0-)=2Vcc/3
C
1
dv
C1
dt
−−−−−−−−−
1
R
A
R
B
+
−−−−−−−−−−−−−−V
C1
0
=
+
6
()
V
C1
t
()
2
3
−−VCCe
-
t
R
A
R
D
+
()C1
−−−−−−−−−−−−−−−−−−−−−−
=
7
()
1
3
---V
CC
2
3
---V
CC
e
=
t
L
R
A
R
D
+
()C1
-------------------------------------
(8)
t
L
C
1
R
B
R
D
+
()In2 0.693 R
B
R
D
+
()C
1
=
=
(9)
frequency,
f
1
T
−−
1.44
R
A
2R
B
+
()C
1
−−−−−−−−−−−−−−−−−−−−−−−−
==
11
()


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