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参数资料
| 型号： | TS3V555 |
| 厂商： | 意法半导体 |
| 英文描述： | 3V LOW POWER SINGLE TIMERS |
| 中文描述： | 3V的低功耗单定时器 |
| 文件页数： | 6/8页 |
| 文件大小： | 74K |
| 代理商： | TS3V555 |
V
CC
Reset
Out
3
4
8
7
5
1
R
C
2
6
R
A
B
Control
Voltage
0.01 F
TS3V555
Figure4
t = 0.5 ms / div
OUTPUT VOLTAGE = 5.0V/div
CAPACITOR VOLTAGE = 1.0V/div
RA
B
L
Figure 5
ASTABLE OPERATION
When the circuit is connectedas shown in figure 4
(pin 2 and 6 connected) it triggers itself and free
runs as a multivibrator. The external capacitor
charges
through R
A
and R
B
and discharges
through R
B
only. Thus the duty cycle may be pre-
cisely 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
TS3V555
6/8
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