Re: chip swelling up and getting fried
From: Winfield Hill (Winfield_member_at_newsguy.com)
Date: 07/14/04
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Date: 14 Jul 2004 05:18:20 -0700
DJ wrote...
>
> I am stuck with this problem of a BGA chip getting fried within a
> few seconds of powerup. ... The CMOS chip works for a few seconds
> but goes on getting hot till the swelling appears ...
Sounds like SCR latchup, wihch once triggered causes a high-current
capable turned-on SCR to appear across the supply rails. If you are
sequencing the power supplies correctly, then you may have an input
that exceeds one of the supplies and is injecting enough current
through the chip's static-protection diodes to initiate SCR latchup.
Thanks,
- Win
(email: use hill_at_rowland-dot-org for now)
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