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TI Home » TI E2E Community » Support Forums » Logic » Logic Forum » AND Gate Power - SN74AHC1G09
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AND Gate Power - SN74AHC1G09

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Anthony Berwin
Posted by Anthony Berwin
on May 16 2012 14:31 PM
Prodigy250 points

When Pin 5 (Vcc) of SN74AHC1G09 is low (or connected to ground), what happens when an external high is put on the inputs or the output?

Regards, Anthony

Logic AND Gate SN74AHC1G09
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  • Edwin Krasser
    Posted by Edwin Krasser
    on May 21 2012 01:01 AM
    Expert2220 points

    If there is no supply your gate will be powered over the signal lines (gate protection diodes at input, bulk diodes at output). But: If you tie Vcc to GND the diodes will be in forward direction to GND, hence you will get some hundred mV at the pins, depending on how strong your signal is (plus a little bit of heat, ...).

    Best regards,
    Edwin Krasser

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  • Anthony Berwin
    Posted by Anthony Berwin
    on May 23 2012 08:13 AM
    Prodigy250 points

    I think you answered my question. Some schematics of the inputs/outputs would be helpful.

    I assume the output will look like a pair of anti-parallel diodes. Is this the same as the bulk diodes you are referring to?

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  • Edwin Krasser
    Posted by Edwin Krasser
    on May 29 2012 00:49 AM
    Expert2220 points

    Hi!

    You should easily find some literature about CMOS schematics on the websites of TI, NXP, ... . Just look for the different CMOS family guides (HC, AHC, LVC, ...).

    Best regards,
    Edwin Krasser

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