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SA555P Datasheet(PDF) 9 Page - Texas Instruments |
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SA555P Datasheet(HTML) 9 Page - Texas Instruments |
9 / 15 page SLFS022 – D1669, SEPTEMBER 1973—REVISED FEBRUARY 1992 NE555, SA555, SE555, SE555C PRECISION TIMERS POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9 APPLICATION INFORMATION monostable operation For monostable operation, any of these timers may be connected as shown in Figure 9. If the output is low, application of a negative-going pulse to TRIG sets the flip-flop (Q goes low), drives the output high, and turns off Q1. Capacitor C is then charged through RA until the voltage across the capacitor reaches the threshold voltage of THRES input. If TRIG has returned to a high level, the output of the threshold comparator will reset the flip-flop (Q goes high), drive the output low, and discharge C through Q1. VCC (5 V to 15 V) RA RL Output GND OUT VCC CONT RESET DISCH THRES TRIG Input Time – 0.1 ms/div Capacitor Voltage Output Voltage Input Voltage RA = 9.1 kΩ CL = 0.01 µF RL = 1 kΩ See Figure 9 5 8 4 7 6 2 3 1 Pin numbers shown are for the D, JG, and P packages. Figure 9. Circuit for Monostable Operation Figure 10. Typical Monostable Waveforms Monostable operation is initiated when TRIG voltage falls below the trigger threshold. Once initiated, the sequence ends only if TRIG is high at the end of the timing interval. Because of the threshold level and saturation voltage of Q1, the output pulse duration is approximately tw = 1.1RAC. Figure 11 is a plot of the time constant for various values of RA and C. The threshold levels and charge rates are both directly proportional to the supply voltage, VCC. The timing interval is therefore independent of the supply voltage, so long as the supply voltage is constant during the time interval. Applying a negative-going trigger pulse simultaneously to RESET and TRIG during the timing interval discharges C and re-initiates the cycle, commencing on the positive edge of the reset pulse. The output is held low as long as the reset pulse is low. To prevent false triggering, when RESET is not used, it should be connected to VCC. C – Capacitance – µF 10 1 10–1 10–2 10–3 10–4 100 10 1 0.1 0.01 10–5 0.001 Figure 11. Output Pulse Duration vs Capacitance RA = 10 MΩ RA = 10 kΩ RA = 1 kΩ RA = 100 kΩ RA = 1 MΩ |
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