Data Line ESD Protection, how it works

Discussion in 'Homework Help' started by bug13, May 7, 2012.

  1. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    [​IMG]

    I come across this while I am studying signal diode arrays, can someone explain it to me, how does it work please, thanks! :)
     
  2. hexreader

    Active Member

    Apr 16, 2011
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    Assuming typical diode forward voltage drop of 0.6 volts...

    Any voltage higher than Vcc+0.6 volts (e.g. 2000 volts electrostatic charge) will flow through the top diode to the power supply, before any damage can be done to the inverter circuit, hopefully.

    Same for any voltage less than GND-0.6 volts, where the other diode will conduct.

    Diode only allows current flow in one direction, so in normal use the diodes will not conduct.
     
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  3. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
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    so the voltage of data line is between +0.6 to -0.6 v?
     
  4. mlog

    Member

    Feb 11, 2012
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    36
    It's limited to the power supply rails plus a diode drop. For example, if the power supply is 5.0 volts, then the input is limited from -0.6 volts to +5.6 volts.
     
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