IC parameters

Discussion in 'General Electronics Chat' started by Dritech, Jul 6, 2013.

  1. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
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    5
    Hi all,

    I want to know the port current rating and power dissipation of the Z80PIO and the 8255A, but cannot find them on their datasheets. Can anyone please tell me what are these parameters called in datasheets??
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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  3. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    Thanks for the reply. So which one is the output current from the ports? is it the 2.5mA ?
     
  4. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
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    I_DAR

    Ken
     
  5. €Hunter

    New Member

    Jul 6, 2013
    33
    3
    It wouldn't be very much, the port current. Enough to drive (fan out) your buffers.
     
  6. Meixner

    Member

    Sep 26, 2011
    116
    21
    I believe Toshiba makes/made an 8255 capable of higher output current, maybe
    15 or 20 ma if I remember right.
     
  7. Dritech

    Thread Starter Well-Known Member

    Sep 21, 2011
    756
    5
    Hi again,

    Thanks for the replies. Why is I_DAR a negative value please? and regarding the Z80PIO where can i find the power please?

    Thanks in advance
     
  8. WBahn

    Moderator

    Mar 31, 2012
    17,715
    4,788
    By nearly universal convention, IC pin currents are positive for current going INTO the pin. Many datasheets get sloppy and just give absolute values.

    This convention, as far as I know, stems from the early days of circuit simulation so that consistent definitions were used for device models and interpreting sim results.
     
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