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TS556M Datasheet(PDF) 9 Page - STMicroelectronics

No. de pieza TS556M
Descripción Electrónicos  LOW POWER DUAL CMOS TIMERS
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
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TS556M Datasheet(HTML) 9 Page - STMicroelectronics

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ASTABLE OPERATION
When the circuit is connected as shown in figure 4
it triggers itself and free runs as a multivibrator. The
external capacitor charges through RA and RB and
discharges through RB only. Thus the duty cycle
may be precisely set by the ratio of these two
resistors.
In the astable mode of operation, C charges and
discharges between 1/3 VCC and 2/3 VCC.As in the
triggered mode, the charge and discharge times
and therefore frequency, are independent of the
supply voltage.
Figure 5 shows actual waveforms generated in this
mode of operation.
The charge time (output HIGH) is given by :
t1 = 0.693 (RA +RB)C
and the discharge time (output LOW) by :
t2 = 0.693 (RB)C
Thus the total period T is given by :
T = t1 + t2 = 0.693 (RA +2RB)C
The frequency of oscillation is then :
f
=
1
T
=
1.44
(RA + 2RB)C
The duty cycle is given by : D
=
RB
RA + 2RB
VCC
Reset
Out
R
C
R
A
B
Control
Voltage
0.01 F
µ
1/2
TS556
Figure 4
µ
t = 0.5 ms / div
OUTPUT VOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 1.0V/div
L
R = R = 4.8 k , C = 0.1 F , R = 1.0k
AB
Figure 5
TS556C,I,M
9/11


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