🚀 go-pugleaf

In article <1992Sep15.213750.3593@zip.eecs.umich.edu> johnwitt@cdrom.engin.umich.edu (John P Wittkoski ) writes:
  > I have a single specific part (say a 74ls04) and say it runs at the same 
  > temperature and humidity all the time. Will the propogation delay for that
  > specific single chip almost always be the same?

Add a couple more restrictions and the answer is Yes:
   the power supply voltage is constant
   the pattern of input stimuli is constant
   the output loading is constant


Prop delay is a strong function of
    1  output load
    2  supply voltage
    3  temperature
    4  input risetime / falltime
    5  input pattern
    6  manufacturing variances


Probably these are self evident except maybe number 5.
It just refers to the fact that not all input pins of an IC
give equally fast delays to the output.  For example many
TTL chips' datasheets give different specs for their
various pins.  What is often left unsaid, though, is that
in several logic families the three inputs of a NOR3 gate
are different speeds to the output (same with NANDs,
AOIs, muxes, etc).