[SI-LIST] Re: Overshoot / Undershoot
- From: "Peterson, James F (FL51)" <james.f.peterson@xxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 19 Jan 2006 04:23:07 -0700
(I might be stating the obvious) There is another, I think more common,
method for esd protection on a 3.3v device that is 5v tolerant: That's
connect several clamp diodes in series before attaching to the 3.3v rail.
You can adjust the qty of these in series so that they do not conduct until
6V (or so). You still get the esd protection plus you're 5v tolerant.
Jim
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Andrew Ingraham
Sent: Wednesday, January 18, 2006 11:51 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Overshoot / Undershoot
> I have never seen a 5V tolerant 3.3V device that had a clamp device
> tied =
to
> 3.3V.
Actually, I have. That's one reason why I always question the words "5V
tolerant" in any data sheet. I guess(?) they figure the constant clamp
current is low enough to not overheat their IC, and therefore they can call
it 5V tolerant. Right.
Then there are ICs without clamps that have a 5.5V instantaneous absolute
maximum rating, and are therefore also "5V tolerant." I guess you can't
deny that, even though it's not going to be interpreted that way.
Regards,
Andy
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