[ibis-quality] Re: An observation on the 2.0 spec.
- From: "Lenski, Eckhard (NSN - DE/Munich)" <eckhard.lenski@xxxxxxx>
- To: <ibis-quality@xxxxxxxxxxxxx>
- Date: Mon, 22 Feb 2010 11:22:24 +0100
Hello Anders,
it looks like you are right. We have forgotten to specify a tolerance or a
value.
I am not sure if this was done intentially.
But for the reasons you mention, I would suggest a tolerance value of 10uA.
first, this is the value stated in most datasheets,
and second, we will asure, that for internal pullup or internal pulldown
current, which is normaly greater than 20uA,
the current is at least twice above our tolerance value for zero.
( although this leakage current should be in the clamp curves, if any )
It is a little bit difficult to explain:
in other words :
tolerance value 10uA
- because it is a typical data sheet value for max. leakage currents
- because it is at least twice the value for some internal pullup-pulldown
currents
regards
eckhard
Mit freundlichen Grüßen / Best regards / Cordiali saluti / ystävällisin
terveisin
Eckhard Lenski
Nokia Siemens Networks GmbH & Co. KG
COO RA GERD BTS BR PDev CAE Lib&IBIS
CAE libraries and models
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________________________________
From: ibis-quality-bounce@xxxxxxxxxxxxx
[mailto:ibis-quality-bounce@xxxxxxxxxxxxx] On Behalf Of ext Anders Ekholm
Sent: Monday, February 22, 2010 10:59 AM
To: ibis-quality@xxxxxxxxxxxxx
Subject: [ibis-quality] An observation on the 2.0 spec.
Sections 5.3.8 & 5.2.9 [Pulldown] and [Pullup] IV tables pass through zero/zero
In the text it says that typ. Min,max should all pass through approximately 0mA
at the 0 Volt point.
But we did not specify what we mean by approximately, maybe we should have ?
5%, 1%, 0.1%, 0.01% of which current ? The average current step in the table ?
The minimum current step in the table?
Maybe that's why we did not specify it, because it was unclear what to relate
it too.
It does seem a bit imprecise as it is and if anyone is trying to automate a
quality checker, they will have to make a decision and since it is not
specified in the
Quality spec different quality checkers will make different decisions on what
approximately means.
Any comments?
Best /Anders
ANDERS EKHOLM M.Sc.E.E
Expert Signal Integrity & Timing Analysis
Ericsson AB
FJB/DBA
Färögatan 6
Stockholm, Sweden
Phone +46107142758
Fax +46107172340
SMS/MMS +46709861707
anders.ekholm@xxxxxxxxxxxx
www.ericsson.com
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