digital gate, thredhold voltage

Discussion in 'Homework Help' started by bug13, Jul 27, 2012.

  1. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    Hi guys

    In digital circuit, say a gate there is a state of either LOW of HIGH, and usually a typical chip can operate from 3v to 18v, so how to I know what voltage rang is LOW and what range is HIGH?

    take this one for example:
    http://www.ti.com/lit/ds/symlink/cd4011b.pdf

    Thanks guys

    Zhuhua
     
  2. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    never mind, I found it in the datasheet, I should have look harder :)
     
  3. Jony130

    AAC Fanatic!

    Feb 17, 2009
    3,962
    1,097
    In CMOS 4000 series we treat LOW if voltage is lower then 1/3Vdd.
    And we have a HIGH state if voltage is greater than 2/3Vdd.
    And the threshold voltage at 1/2Vdd
     
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