TS3V555IDT STMicroelectronics, TS3V555IDT Datasheet - Page 8

• Manufacturer Part Number: TS3V555IDT
• Manufacturer: STMicroelectronics

Specifications of TS3V555IDT

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TS3V555
ASTABLE OPERATION
When the circuit is connected as shown in figure 4
(pin 2 and 6 connected) it triggers itself and free
runs as a multivibrator. The external capacitor
charges through R
through R
cisely set by the ratio of these two resistors.
In the astable mode of operation, C charges and
discharges between 1/3 V
the triggered mode, the charge and discharge
times and therefore frequency, are independent of
the supply voltage.
Figure 4 :
Figure 5 shows actual waveforms generated in
this mode of operation.
The charge time (output HIGH) is given by :
t1 = 0.693 (R
and the discharge time (output LOW) by :
t2 = 0.693 (R
Thus the total period T is given by :
T = t1 + t2 = 0.693 (R
The frequency of oscillation is then :
8/10
f =
-- - =
T
1
Control
Voltage
0.01 F
V
------------------------------------- -
( RA
CC
Out
B
only. Thus the duty cycle may be pre-
A
B
+
1.44
) C
+ R
2 R B C
Australia - Belgium - Brazil - Canada - China - Czech Repubic - Finland - France - Germany
5
Reset
3
Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain
B
) C
A
1
TS3V555
A
4
+ 2R
and R
CC
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All other names are the property of their respective owners.
B
) C
8
and 2/3 V
B
2
Sweden - Switzerland - United Kingdom - United States
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and discharges
7
6
STMicroelectronics GROUP OF COMPANIES
CC
R
R
C
. As in
B
A
http://www.st.com
The duty cycle is given by :
Figure 5 :
D =
---------------------------
R A
RB
+
2 RB
R = R = 4.8 k , C = 0.1 F , R = 1.0k
A
t = 0.5 ms / div
OUTPUT VOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 1.0V/div
B
L