Device Driver

Discussion in 'Homework Help' started by hitmen, Apr 2, 2009.

  1. hitmen

    Thread Starter Active Member

    Sep 21, 2008
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    The output of device A is able to drive the input of device B provided that all these conditions are met:
    VOL (max) of A is ≤ VIL (max) of B
    VOH (min) of A is ≥ VIH (min) of B
    IOH (max) of A is ≥ IIH (max) of B
    IOL (max) of A is ≥ IIL (max) of B

    Can anyone explain or provide me with a suitable link?
    I only do not understand the first condition
     
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    The first condition?

    Unless the maximum possible low output value of A is always less than the permissible low input range of B, then A's output cannot be guaranteed to always drive B's input to the valid low state.
     
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
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    Perhaps I could have more correctly stated the relevant part of the sentence as :-

    "... always no greater than the permissible low input range ..."

    - so as to better match the "less than or equal to" condition.

    Finding the words is never easy! I'll keep trying.
     
  4. hitmen

    Thread Starter Active Member

    Sep 21, 2008
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    errr I prefer a digram. where does the current flow?
     
  5. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    The first and second statements are valid even if no current flows. All four are general requirements for any voltage-mode logic system - TTL, CMOS, ECL.
     
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