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NA555 Datasheet(PDF) 15 Page - Texas Instruments |
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NA555 Datasheet(HTML) 15 Page - Texas Instruments |
15 / 24 page www.ti.com Sequential Timer S VCC RESET VCC OUT DISCH GND CONT TRIG 4 8 3 7 6 1 5 2 THRES RC CC 0.01 CC = 14.7 µF RC = 100 kΩ Output C RESET VCC OUT DISCH GND CONT TRIG 4 8 3 7 6 1 5 2 THRES RB 33 k Ω 0.001 0.01 µF CB = 4.7 µF RB = 100 kΩ Output B Output A RA = 100 kΩ CA = 10 µF µF 0.01 µF 0.001 33 k Ω RA THRES 2 5 1 6 7 3 8 4 TRIG CONT GND DISCH OUT VCC RESET µF µF CB CA Pin numbers shown are for the D, JG, P, PS, and PW packages. NOTE A: S closes momentarily at t = 0. t − Time − 1 s/div See Figure 22 Output A Output B Output C t = 0 twC = 1.1 RCCC twC twB = 1.1 RBCB twA = 1.1 RACA twA twB NA555, NE555, SA555, SE555 PRECISION TIMERS SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 APPLICATION INFORMATION (continued) Many applications, such as computers, require signals for initializing conditions during start-up. Other applications, such as test equipment, require activation of test signals in sequence. These timing circuits can be connected to provide such sequential control. The timers can be used in various combinations of astable or monostable circuit connections, with or without modulation, for extremely flexible waveform control. Figure 22 shows a sequencer circuit with possible applications in many systems, and Figure 23 shows the output waveforms. Figure 22. Sequential Timer Circuit Figure 23. Sequential Timer Waveforms 15 Submit Documentation Feedback |
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