From: Jason White <whitewaterssoftwareinfo@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Wed, 26 Feb 2020 13:53:39 -0800
Subject: Re: [EE] 74LVC1G332 input clamping current only specified for VI <
 0 V
Thread-Topic: [EE] 74LVC1G332 input clamping current only specified for VI <
 0 V
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Thanks everyone!

I will design accordingly

On Wed, Feb 26, 2020 at 4:47 PM <speff@interlog.com> wrote:
>
> Quoting Jason White <whitewaterssoftwareinfo@gmail.com>:
>
> > Hello,
> >
> > I am considering subjecting the input of a 74LVC1G332 to 12 to 48V
> > though a resistor and relying upon the internal clamping diodes.
> >
> > Problem is, this device only specifies clamping diode current for VI <
> > 0 V (and not for VI > VCC). However, it does specify that it passes
> > various EMI certifications.
> >
> > I know I could use an Zener diode, but I am curious: what is going on
> > here with the datasheet specification?
> >
>
> Hi, Jason: -
>
> That's a 5V-tolerant part, so does not have a clamping network to Vcc.
> There's no doubt some kind of zener like structure inside for ESD.
>
> It's not the best to rely on the diodes during normal operation as
> they can result in excessive current draw or other strange behavior.
> A BAT54S dual Schottky will clamp to both rails before any diode in the
> gate gets a chance to conduct much. The clamping numbers are abs max.
>
> Best regards,
> Spehro Pefhany
>
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
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Jason White
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