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SA555DR Datasheet(PDF) 11 Page - Texas Instruments |
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SA555DR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 27 page www.ti.com t H + 0.693 (R A ) R B) C t L + 0.693 (R B) C Other useful relationships are shown below. period + tH ) tL + 0.693 (RA ) 2RB) C frequency [ 1.44 (R A ) 2R B ) C Output driver duty cycle + t L t H ) t L + R B R A ) 2R B Output waveform duty cycle + t L t H + R B R A ) R B Low-to-high ratio + t H t H ) t L + 1– R B R A ) 2R B C − Capacitance − µF 100 k 10 k 1 k 100 10 1 100 10 1 0.1 0.01 0.1 0.001 RA + 2 RB = 10 MΩ RA + 2 RB = 1 MΩ RA + 2 RB = 100 kΩ RA + 2 RB = 10 kΩ RA + 2 RB = 1 kΩ Missing-Pulse Detector Time − 0.1 ms/div VCC = 5 V RA = 1 kΩ C = 0.1 µF See Figure 15 Capacitor Voltage Output Voltage Input Voltage VCC (5 V to 15 V) DISCH OUT VCC RESET RL RA A5T3644 C THRES GND CONT TRIG Input 0.01 µF Output 4 8 3 7 6 2 5 1 Pin numbers shown are shown for the D, JG, P, PS, and PW packages. NA555, NE555, SA555, SE555 PRECISION TIMERS SLFS022G – SEPTEMBER 1973 – REVISED MARCH 2008 Figure 12 shows typical waveforms generated during astable operation. The output high-level duration tH and low-level duration tL can be calculated as follows: Figure 14. Free-Running Frequency The circuit shown in Figure 15 can be used to detect a missing pulse or abnormally long spacing between consecutive pulses in a train of pulses. The timing interval of the monostable circuit is retriggered continuously by the input pulse train as long as the pulse spacing is less than the timing interval. A longer pulse spacing, missing pulse, or terminated pulse train permits the timing interval to be completed, thereby generating an output pulse as shown in Figure 16. Figure 15. Circuit for Missing-Pulse Detector Figure 16. Completed Timing Waveforms for Missing-Pulse Detector Copyright © 1973–2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): NA555 NE555 SA555 SE555 |
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