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TS556IN Folha de dados(PDF) 8 Page - STMicroelectronics |
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TS556IN Folha de dados(HTML) 8 Page - STMicroelectronics |
8 / 11 page APPLICATION INFORMATION MONOSTABLE OPERATION In the monostable mode,the timer functions as a one-shot. Referring to figure 2 the external capaci- tor is initially held discharged by a transistor inside the timer. VCC Reset Trigger Out R C Control Voltage 0.01 F µ 1/2 TS556 Figure 2 CC SUPPLY VOLTAGE, V (V) 300 200 100 04 8 12 16 TYPICAL CHARACTERISTICS Figure 1 : Supply Current (each timer) versus Supply Voltage The circuit triggers on a negative-goinginput 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. 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 simultaneously to the Reset terminal (pin 4 or 10) and the Trigger terminal (pin 2 or 8) 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. During the time the reset pulse is applied, the output is driven to its LOW state. When a negative trigger pulse is applied to the trigger terminal, the flip-flop is set, releasing the short circuit across the external capacitor and driv- ing the output HIGH. The voltage across the ca- pacitor 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. 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 Figure 3 TS556C,I,M 8/11 |
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