Diodes NA555 - Manual (Page 11)

NE555/SA555/NA555
PRECISION TIMERS
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
11 of 14
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February 2012
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Typical Applications Characteristics (cont.)
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 14 shows a sequencer circuit with possible applications in
many systems, and Figure 15 shows the output waveforms.
Fig 14. Circuit for Sequential Timer
Fig 15. Sequential timer waveforms