ESD susceptibility has a couple of components. Simplistically,
don't let it happen or try to direct the energy where you want it, and does
the event happen at just the right (wrong?) time. Just as a critical gate is
changing states for example. Given the relative rate that modern processors
are running 800 Mhz - 1 Ghz, I don't know that increasing the discharge rate
from a second to 20 or even 50 times a second really increases your ability
to capture one of these states. Having said that, I don't really have a
quarrel with increasing the rates for investigative purposes, I have done it
myself. However, I think you should keep in mind the heating of
silicon junctions etc, from the rapid discharge rates. Even non-critical
gates can be artificially damaged by rapid pulses. I can't think of a case
when an ESD discharge (not lightning etc) naturally occurs at very high
rates. I'd be interested in examples if it does occur.
Not a bad diagnostic tool but I wouldn't care to see higher rates
implemented in standards.
Gary
(You can't expect much for two cents these days)
-----Original Message-----
From: HALL,KEN (HP-Roseville,ex1) [mailto:ken_h...@hp.com]
Sent: Thursday, August 02, 2001 7:53 AM
To: 'Michael Hopkins'; am...@westin.org; emc-p...@majordomo.ieee.org
Cc: AGUILAR,LONNIE (HP-Roseville,ex1); 'Pommerenke, David'
Subject: RE: ESD - time between successive discharges
Hello all,
If I remember correctly the one shot/second was to allow "older" simulators
time to recharge.
We believe that the probability of identifying an ESD susceptible product is
increased dramatically when subjecting the product to continuous discharges.
Ken Hall
Lonnie please file.
Thanks,
Ken
-----Original Message-----
From: Michael Hopkins [mailto:mhopk...@thermokeytek.com]
Sent: Thursday, August 02, 2001 3:48 AM
To: am...@westin.org; emc-p...@majordomo.ieee.org
Subject: Re: ESD - time between successive discharges
Seems to me the time between discharges is the same as the time between
pulses (I believe that was the intent). I don't have the standard in front
of me, but I think the max rate was 1/second, which means you could go
slower. In most tests I've seen, the several discharges at one point are run
at the 1/second rate, but then there could be several seconds or more
between the discharges at that point and the discharges at the next point.
At least one company actually runs tests at much higher discharge rates and
with many more shots/point than IEC recommends (the new draft of ANSI C63.16
goes to 50 shots/per point).
Michael Hopkins
Thermo KeyTek
----- Original Message -----
From: <am...@westin.org>
To: <emc-p...@majordomo.ieee.org>
Sent: Wednesday, August 01, 2001 4:06 PM
Subject: ESD - time between successive discharges
>
> Dear members,
>
> From IEC61000-4-2 and several EN-product standards, they specify the time
> between successive discharges to be at least 1 second.
>
> But what is the maximum time between each pulse ? I can not see that it is
> stated in any standards. I guess the test labs use 1 pulse pr second.
>
> I feel that the pulse rate can have influences on the EUT performance, so
1
> second compared to 3-5 seconds might be the difference between PASS and
FAIL.
>
> Any suggestions ?
>
> Best regards
> Amund Westin
> Oslo, Norway
>
> --
> Get your firstname@lastname email for FREE at http://Nameplanet.com/?su
>
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