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参数资料
| 型号： | TS3V556IN |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟波形发生器 |
| 英文描述： | DUAL PULSE; RECTANGULAR, 2 MHz, TIMER, PDIP14 |
| 封装： | PLASTIC, DIP-14 |
| 文件页数： | 6/8页 |
| 文件大小： | 104K |
| 代理商： | TS3V556IN |
TS3V556
6/8
Do
no
t u
se
for
new
design
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 4 :
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 :
The duty cycle is given by :
Figure 5 :
VCC
Reset
Out
R
C
R
A
B
Control
Voltage
0.01 F
TS3V556
f =
1
T
--- =
1.44
(
RA
2
RB
)C
+
--------------------------------------
D =
RB
RA
2
RB
+
---------------------------
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
Do
no
t u
se
for
new
design
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