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 How to Handle a floating output? 

Last post Sun, Nov 15 2009 9:04 AM by Andrew Beckett. 1 replies.
Started by pitter 15 Nov 2009 04:03 AM. Topic has 1 replies and 2629 views
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  • Sun, Nov 15 2009 4:03 AM

    • pitter
    • Top 500 Contributor
    • Joined on Tue, Nov 3 2009
    • Warsaw, Poland
    • Posts 29
    • Points 485
    How to Handle a floating output? Reply

    Hi,

    what is a common practice in IC design, when, for example, a Q output od a D flip-flop is not used. Is it left floating, pulled up/down with a resistor or any other load?

     Kind Regards,

    pitter.

    • Post Points: 20
  • Sun, Nov 15 2009 9:04 AM

    Re: How to Handle a floating output? Reply
    It's normally left floating. You can alway attach a "noConn" component from the basic library if you want to avoid the warning marker you would otherwise see in the schematic editor for a floating output.

    Using a resistor is not only a waste of area, but also a waste of power in the case of the Q output being the opposite of the rail to which the resistor is tied.

    Regards,

    Andrew
    • Post Points: 5
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Started by pitter at 15 Nov 2009 04:03 AM. Topic has 1 replies.