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SE555P Datasheet(PDF) 10 Page - Texas Instruments |
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SE555P Datasheet(HTML) 10 Page - Texas Instruments |
10 / 36 page 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 C − Capacitance − µF 10 1 10−1 10−2 10−3 10−4 100 10 1 0.1 0.01 10−5 0.001 RA = 10 MΩ RA = 10 kΩ RA = 1 kΩ RA = 100 kΩ RA = 1 MΩ VCC (5 V to 15 V) RA RL Output GND OUT VCC CONT RESET DISCH THRES TRIG Input 5 8 4 7 6 2 3 1 Pin numbers shown are for the D, JG, P, PS, and PW packages. NA555, NE555, SA555, SE555 SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014 www.ti.com Feature Description (continued) Figure 9. Circuit for Monostable Operation Monostable operation is initiated when TRIG voltage falls below the trigger threshold. Once initiated, the sequence ends only if TRIG is high for at least 10 µs before the end of the timing interval. When the trigger is grounded, the comparator storage time can be as long as 10 µs, which limits the minimum monostable pulse width to 10 µs. 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 both are 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 reinitiates 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. Figure 10. Typical Monostable Waveforms Figure 11. Output Pulse Duration vs Capacitance 10 Submit Documentation Feedback Copyright © 1973–2014, Texas Instruments Incorporated Product Folder Links: NA555 NE555 SA555 SE555 |
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