參數(shù)資料
型號: TS556ID
廠商: 意法半導(dǎo)體
元件分類: 定時器
英文描述: LOW POWER DUAL CMOS TIMERS
中文描述: 低功耗雙通道CMOS定時器
文件頁數(shù): 9/11頁
文件大小: 98K
代理商: TS556ID
ASTABLE OPERATION
When the circuit is connectedas shown in figure 4
it triggersitselfandfree runsasamultivibrator.The
externalcapacitorchargesthrough R
A
andR
B
and
discharges through R
B
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
dischargesbetween1/3 V
CC
and2/3 V
CC
. Asinthe
triggered mode, the charge and discharge times
and therefore frequency, are independent of the
supply voltage.
Figure5showsactualwaveformsgeneratedinthis
mode of operation.
The charge time (output HIGH)is given by :
t1 = 0.693 (R
A
+ R
B
) C
and the dischargetime (output LOW) by :
t2 = 0.693 (R
B
) C
Thus the total period T is given by :
T = t1 + t2 = 0.693 (R
A
+ 2R
B
) C
The frequencyof oscillation is then :
f
=
1
T
=
(
R
A
+
2R
B
)
C
1.44
The duty cycle is given by : D
=
R
B
R
A
+
2
R
B
V
CC
Reset
Out
R
C
R
A
B
Control
Voltage
0.01 F
1/2
TS556
Figure4
t = 0.5ms / div
OUTPUTVOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 1.0V/div
RA
B
L
Figure 5
TS556C,I,M
9/11
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