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参数资料
| 型号： | TS555IDT |
| 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： | 4/20页 |
| 文件大小： | 232K |
| 代理商： | TS555IDT |
Application information
TS555
12/20
4
Application information
4.1
Monostable operation
In monostable mode, the timer operates like a one-shot generator. The external capacitor is
initially held discharged by a transistor inside the timer, as shown in Figure 4.
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.
Since the charge rate and 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 then 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 false triggering.
Figure 5.
Timing diagram
VCC
Reset
Trigger
Out
3
2
4
8
7
6
5
1
TS555
R
C
Control Voltage
0.01 F
μ
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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