NE555,SA555,SE555

PRECISION TIMERS

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APPLICATION INFORMATION

Sequential timer

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.

Pin numbers shown are for the D, JG, P, PS, and PW packages.

NOTE A: S closes momentarily at t =0.

Figure 22. Sequential Timer Circuit

t – Timer – 1 s/div

Figure 23. Sequential Timer Waveforms