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参数资料
| 型号： | TS3V555IDT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟波形发生器 |
| 英文描述： | PULSE; RECTANGULAR, 2 MHz, TIMER, PDSO8 |
| 封装： | MICRO, PLASTIC, SO-8 |
| 文件页数： | 8/10页 |
| 文件大小： | 107K |
| 代理商： | TS3V555IDT |
TS3V555
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APPLICATION INFORMATION
MONOSTABLE OPERATION
In the monostable mode,the timer functions as a
one-shot. Referring to figure 2 the external capac-
itor is initially held discharged by a transistor in-
side the timer.
Figure 2 :
The circuit triggers on a negative-going input sig-
nal when the level reaches 1/3 VCC. Once trig-
gered,the circuit remains in this state until the set
time has elapsed,even if it is triggered again dur-
ing this interval. The duration of the output HIGH
state is given by t = 1.1 R x C.
Notice that since the charge rate and the threshold
level of the comparator are both directly propor-
tional to supply voltage, the timing interval is inde-
pendent of supply. Applying a negative pulse si-
multaneously to the Reset terminal (pin 4) and the
Trigger terminal (pin 2) during the timing cycle dis-
charges the external capacitor and causes the cy-
cle to start over. The timing cycle now starts on the
positive edge of the reset pulse. During the time
the reset pulse is applied, the output is driven to its
LOW state.
When a negative trigger pulse is applied to pin 2,
the flip-flop is set, releasing the short circuit across
the external capacitor and driving the output
HIGH. The voltage across the capacitor increases
exponentially with the time constant
τ = R x C.
When the voltage across the capacitor equals 2/3
VCC, the comparator resets the flip-flop which then
discharges the capacitor rapidly and drives the
output to its LOW state.
Figure 3 shows the actual waveforms generated in
this mode of operation.
When Reset is not used, it should be tied high to
avoid any possible or false triggering.
Figure 3 :
VCC
Reset
Trigger
Out
3
2
4
8
7
6
5
1
R
C
Control Voltage
0.01 F
TS3V555
CAPACITOR VOLTAGE = 2.0V/div
t = 0.1 ms / div
INPUT = 2.0V/div
OUTPUT VOLTAGE = 5.0V/div
R = 9.1k , C = 0.01 F , R = 1.0k
L
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se
for
new
design
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TS3V555IN | 功能描述:计时器和支持产品 Low Power Single RoHS:否 制造商:Micrel 类型:Standard 封装 / 箱体:SOT-23 内部定时器数量:1 电源电压-最大:18 V 电源电压-最小:2.7 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
| TS3V556 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3V LOW POWER DUAL TIMERS |
| TS3V556AID | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| TS3V556AIN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Timer Circuit |
| TS3V556I | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3V LOW POWER DUAL TIMERS |
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