High in on uP

Discussion in 'General Electronics Chat' started by Konstabel, Feb 2, 2008.

  1. Konstabel

    Thread Starter Active Member

    Jan 31, 2008
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    0
    If I need a pin on an IC to be a constant high, is is 'safe' to connect these to vcc? Or is there some other way that this should be done?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    If the device is CMOS, that is safe to do. If the pin can be switched to an output, then you need to use a pullup resistor of around 100K to prevent damage should the pin ever get wrongly set.
     
  3. Konstabel

    Thread Starter Active Member

    Jan 31, 2008
    52
    0
    Thanks. That is all I needed to know. The pins are input only (latch enable) on a 4511 chip.
     
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