fan in/fan out

Discussion in 'Homework Help' started by nearownkira, May 14, 2008.

  1. nearownkira

    Thread Starter Member

    Feb 19, 2008
    20
    0
    Is there a equation to determine the relation ship between fan in/fan out and propagation delay in an CMOS inverter circuit or any general CMOS circuit.
     
    Last edited by a moderator: May 14, 2008
  2. techroomt

    Senior Member

    May 19, 2004
    198
    1
    i have never heard of a formula for that relationship, maybe one exists. i think you are always best to consult the spec data on each and every ic used.
     
  3. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    145
    Yes, it is:

    Delay = (Logical effort x Fan out) + Parasitic delay

    These variables are entirely gate and driven-load dependant.

    Dave
     
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