We assume that the slowly changing waveform at the
Nv
input produces a single output transition when it crosses
the Nv
switching threshold. This is accomplished by using a 74HC14
or similar CMOS Schmitt
trigger. When 74HC04 or 74HC240s are used for Nv
inverters some nasty oscillations occur during switching
which makes these inverters unsuitable for most Nv
networks greater than 2 Nv
in series.
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