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TS556I Folha de dados(PDF) 8 Page - STMicroelectronics |
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TS556I Folha de dados(HTML) 8 Page - STMicroelectronics |
8 / 11 page TS556 8/11 TYPICAL CHARACTERISTICS Figure 1 : Supply Current (each timer) versus Supply Voltage APPLICATION INFORMATION MONOSTABLE OPERATION In the monostable mode,the timer operates like a one-shot generator. Referring to figure 2, the ex- ternal capacitor is initially held discharged by a transistor inside 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. 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 inter- val is independent of the supply. Applying a nega- tive 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 driv- en 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 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 : CC SUPPLY VOLTAGE, V (V) 300 200 100 0 4 8 12 16 VCC Reset Trigger Out R C Control Voltage 0.01 F µ 1/2 TS556 CAPACITOR VOLTAGE = 2.0V/div Ω 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 |
Nº de peça semelhante - TS556I |
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Descrição semelhante - TS556I |
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