digital gate, thredhold voltage

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

  1. bug13

    Thread Starter Senior Member

    Feb 13, 2012
    1,233
    40
    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 Senior Member

    Feb 13, 2012
    1,233
    40
    never mind, I found it in the datasheet, I should have look harder :)
     
  3. Jony130

    AAC Fanatic!

    Feb 17, 2009
    4,082
    1,149
    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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