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TI Home » TI E2E Community » Support Forums » Logic » Logic Forum » Clamp Diodes on analog pins of the CD54HC4051
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Clamp Diodes on analog pins of the CD54HC4051

Clamp Diodes on analog pins of the CD54HC4051

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David J Schmidt
Posted by David J Schmidt
on Dec 03 2012 10:37 AM
Prodigy210 points

I have a question regarding the TI CD54HC4051 device, and the datasheet is attached.  Are there clamping diodes on the analog I/O signals?  If so, what is the maximum current thru those diodes?  There doesn’t appear to be any clamping diodes according the datasheet, but I want to be absolutely sure of it.

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  • Chris Cockrill
    Posted by Chris Cockrill
    on Dec 03 2012 11:15 AM
    Verified Answer
    Verified by David J Schmidt
    Mastermind32850 points

    there are diodes and they are rated at 20ma.  If you look at the absolute max limits you will see Iik and Iok.  Both specd with +/- current.s.  This means there is a clamp diode to Vcc and to Gnd on the inputs and the outputs.

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  • Jim K
    Posted by Jim K
    on Dec 07 2012 11:33 AM
    Verified Answer
    Verified by David J Schmidt
    Prodigy140 points

    What is the voltage drop of the clamping diodes?

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  • Chris Cockrill
    Posted by Chris Cockrill
    on Dec 10 2012 13:56 PM
    Verified Answer
    Verified by David J Schmidt
    Mastermind32850 points

    approximately .7V

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