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Subject: Re: ESD Protection in Automotive Environment
Date: Sun, 08 Dec 2002 16:15:05 GMT
NNTP-Posting-Date: Mon, 09 Dec 2002 03:15:05 EST
Organization: BigPond Internet Services (http://www.bigpond.net.au)
One of the biggest issues is latch up. HCMOS devices will latch up with
less than -0.6V of noise on the ground line, or +0.6V on the power
lines. A lot of people protect their I/O with diode clamping, but this
is really inadequate in an automotive environment, especially with HCMOS
devices. The solution I always used was an active clamping array such as
the SP720AB from Harris. Intersil have taken over Harris. I don't know
if they still make the 720, but they certainly make the 724, a device
with fewer clamps. IIRC these devices have good app notes/documentation
on latch up, if not Moto and Harris used to have them.
Mark Neugebauer wrote:
> is there anybody who could give me a quick help with the following
> document from Philips:
> "Protection of HCMOS-Logic IC's in the Automotive Environment"
> It should have been on the Internet for download (in the past) but I
> could not find it anywhere. As far as I know it was free for download
> - so there should be no copyright problem?!? A direct mail to my
> adress above would be great - please remove the 'NOSPAM.' first. Any
> further tip where I could get it from would be appreciated, too.
> Thanx in advance.
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