KA555 Fairchild Semiconductor, KA555 Datasheet - Page 7

IC TIMER CONTROLLER SGL 8-DIP

KA555

Manufacturer Part Number
KA555
Description
IC TIMER CONTROLLER SGL 8-DIP
Manufacturer
Fairchild Semiconductor
Type
555 Type, Timer/Oscillator (Single)r
Datasheet

Specifications of KA555

Voltage - Supply
4.5 V ~ 16 V
Current - Supply
7.5mA
Operating Temperature
0°C ~ 70°C
Package / Case
8-DIP (0.300", 7.62mm)
Frequency
100kHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Count
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
KA555
Quantity:
5 510
Part Number:
KA555
Manufacturer:
F/C
Quantity:
179
Part Number:
KA5551
Manufacturer:
SMGK
Quantity:
5 510
Part Number:
KA555D
Quantity:
40
Part Number:
KA555D
Manufacturer:
FAIRCHILD/仙童
Quantity:
20 000
Part Number:
KA555DTF
Manufacturer:
JRC
Quantity:
41 283
Part Number:
KA555I
Manufacturer:
NS
Quantity:
44
Part Number:
KA555ID
Manufacturer:
FAIRCHILD/仙童
Quantity:
20 000
The equivalent circuit for discharging capacitor C1, when timer output is low, is as follows:
Since the duration of the timer output low state(
Since R
t
Consequently, if the timer operates in astable, the period is the same with
'T=t
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.
L
=0.693R
V
t
frequency,
C1
H
L
1
-- - V
3
V
C
+t
t
C1
C1
H
=
1
CC
L
D
t
dv
=0.693(RA+R
C
=
dt
is normally R
t
1
=
C1
B
=
C
C
=
R
2
3
V
1
2
-- - V
3
1
+
V
2
3
B
C1
R
CC
R
V CC e
CC
+
(0-)=2Vcc/3
A
A
R
+
1
+
e
D
R
=
f
R
R
B
-
In2
V
B
=
B
B
------------------------------------ -
B
R
CC
R A
)C
V
A
T
In2
1
>> R
C1
+
=
1
=
R
t
+
+0.693R
0.693 R
1
D
t
=
R D
=
L
D
R
C1
0.693 R
0
2
3
A
although related to the size of discharging Tr.,
e
C1
+
1.44
2R
B
B
-
C
+
B
6
1
R A
7
A
R
=0.693(R
C
+
D
1
+
R
t H
C
R B
B
1
t
L
C
R
) is the amount of time it takes for the V
C1
1
D
A
11
+2R
(8)
(9)
B
)C
5
(10)
1
4
' because the period is the sum of the charge time and discharge
C1
(t) to reach Vcc/3,
KA555
KA555
KA555
KA555
7 7 7 7

Related parts for KA555