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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： | 4/19页 |
| 文件大小： | 182K |
| 代理商： | TS556IN |
Application information
TS556
12/19
4
Application information
4.1
Monostable operation
In the monostable mode, the timer operates like a one-shot generator. Referring to figure 2,
the external capacitor is initially held discharged by a transistor inside the timer, as shown in
Figure 4.
Application schematic
The circuit triggers on a negative-going input signal when the level reaches 1/3 VCC. Once
triggered, the circuit remains in this state until the set time has elapsed, even if it is triggered
again during this interval. The duration of the output HIGH state is given by t = 1.1 R x C.
It can be noticed that since the charge rate and the threshold level of the comparator are
both directly proportional to the supply voltage, the timing interval is independent of the
supply. Applying a negative pulse simultaneously to the Reset terminal (pin 4) and the
Trigger terminal (pin 2) during the timing cycle discharges the external capacitor and causes
the cycle to start over. The timing cycle now starts on the positive edge of the reset pulse.
While the reset pulse is applied, the output is driven to the 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 5 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 5.
Timing diagram
VCC
Reset
Trigger
Out
R
C
Control Voltage
0.01 F
μ
1/2
TS556
CAPACITOR VOLTAGE = 2.0V/div
Ω
μ
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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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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