[SI-LIST] DRAM capacitance
- From: "DAVID CUTHBERT" <telegrapher9@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 14 Nov 2007 14:41:27 -0700
Vadim,
you could contact the DRAM applications departments to find the
answer. Here is what I recall from taking such measurements two years
ago:
VDDQ can be 20 pF per DQ. A 32 DQ DRAM might measure 640 pF. The 20 pF
is due to one-die decoupling capacitors. These capacitors are a mixed
blessing and chosing the value incorrectly can create EMI issues. The
VDD capacitance should vary with frequency and whether the DRAM is
active or not. In quiescent mode at 1 MHz I have measured a few
nanofarads, if I remember correctly.
Dave Cuthbert
Consultant
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