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LM555-MIL bảng dữ liệu(PDF) 9 Page - Texas Instruments |
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LM555-MIL bảng dữ liệu(HTML) 9 Page - Texas Instruments |
9 / 18 page +VCC TRIGGER RESET DISCHARGE THRESHOLD CONTROL VOLTAGE C 0.01 µF +5 V TO +15 V NORMALLY ³21´ /2$' NORMALLY ³2))´ /2$' OUTPUT LM555-MIL 1 5 6 7 8 4 2 3 RA RL Copyright © 2017, Texas Instruments Incorporated RL 9 LM555-MIL www.ti.com SNAS745 – JUNE 2017 Product Folder Links: LM555-MIL Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Feature Description (continued) LM555-MIL timer receives a signal at the trigger input that falls below a 1/3 of the voltage supply. The width of the output pulse is determined by the time constant of an RC network. The output pulse ends when the voltage on the capacitor equals 2/3 of the supply voltage. The output pulse width can be extended or shortened depending on the application by adjusting the R and C values. • Astable (free-running) mode: The LM555-MIL timer can operate as an oscillator and puts out a continuous stream of rectangular pulses having a specified frequency. The frequency of the pulse stream depends on the values of RA, RB, and C. 7.4 Device Functional Modes 7.4.1 Monostable Operation In this mode of operation, the timer functions as a one-shot (Figure 11). The external capacitor is initially held discharged by a transistor inside the timer. Upon application of a negative trigger pulse of less than 1/3 VCC to pin 2, the flip-flop is set which both releases the short circuit across the capacitor and drives the output high. Figure 11. Monostable The voltage across the capacitor then increases exponentially for a period of t = 1.1 RA C, at the end of which time the voltage equals 2/3 VCC. The comparator then resets the flip-flop which in turn discharges the capacitor and drives the output to its low state. Figure 12 shows the waveforms generated in this mode of operation. Since the charge and the threshold level of the comparator are both directly proportional to supply voltage, the timing interval is independent of supply. VCC = 5 V Top Trace: Input 5V/Div. TIME = 0.1 ms/DIV. Middle Trace: Output 5V/Div. RA = 9.1 kΩ Bottom Trace: Capacitor Voltage 2V/Div. C = 0.01 μF Figure 12. Monostable Waveforms |
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