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NE555 Datasheet(PDF) 7 Page - Fairchild Semiconductor

Part No. NE555
Description  Single Timer
Download  14 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

NE555 Datasheet(HTML) 7 Page - Fairchild Semiconductor

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LM555/NE555/SA555
7
7
7
7
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
---V
CC
e
-
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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