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参数资料
| 型号： | TS556IN |
| 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： | 5/19页 |
| 文件大小： | 182K |
| 代理商： | TS556IN |
TS556
Application information
13/19
4.2
Astable operation
When the circuit is connected as shown in Figure 6 (pins 2 and 6 connected) it triggers itself
and 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 6.
Application schematic
Figure 7 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 x RB x 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 7.
Timing diagram
VCC
Reset
Out
R
C
R
A
B
Control
Voltage
0.01 F
μ
1/2
TS556
f =
1
T
--- =
1.44
(RA
2RB
)C
+
--------------------------------------
D =
RB
RA
2RB
+
---------------------------
Ω
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS556IN | 制造商:STMicroelectronics 功能描述:Timer IC |
| TS556M | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LOW POWER DUAL CMOS TIMER |
| TS556MD | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LOW POWER DUAL CMOS TIMERS |
| TS556MJ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| TS556MN | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LOW POWER DUAL CMOS TIMERS |
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