[SI-LIST] Termination resistor drift

From: "Jim Sutherland" <JimS@xxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Date: Wed, 14 Aug 2002 11:05:28 -0700

Hi,
In some data sheets for inexpensive thick-film resistors that get used =
for terminations in memory buses, the deltaR/R time stability is given =
as 3% per 1000 hours.  Does this mean that for one year (8760 hours) the =
resistor value can drift 3% x 8.7 =3D 26%?   and 52% in 2 years?  If =
true, do OEMs use more stable resistors?  If not, what is the impact on =
the signal integrity after one year?  (I have seen data sheets for =
MIL-SPEC resistors with 0.5% / 1000 hours stability but haven't seen how =
much they cost.)
Thanks in advance,
Jim
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[SI-LIST] Termination resistor drift

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