question about fan-out experiment

Discussion in 'Homework Help' started by mr.harm, Aug 27, 2009.

  1. mr.harm

    Thread Starter Member

    Nov 24, 2008
    29
    1
    Hello,
    It is a question in my pre-lab manual. The experiment is about measuring the current (output) and voltage (output) of a 7404 when deriving another 7404's. Mesuring first when deriving only one 7404 and then two.. till reaching 10 7404's. The question why is it better to apply 5V(high input) to the input of the deriving IC than applying (Low input) and then measuring the output voltage and current.

    many thanks....
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Can you express the question better?
     
  3. rjenkins

    AAC Fanatic!

    Nov 6, 2005
    1,015
    69
    Look at the input and output characteristics of the IC and think which conditions load things more...
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    Does anybody use old fashioned 74xx series TTL logic ICs anymore?
    They have a very high supply current even when they are doing nothing.
     
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