SDRAM stable ?

Question

Hi All,            Do you ever experience SDRAM not stable in mass production?Best regards,Boki.

PeteS · Accepted Answer

I have never had issues with SDRAM or DDR that was in production in the last 10 years or so. Of course, if you are buying from a 're-labeller', your results may vary.

My experience is for units in production (still are as far as I know, 6 different products, multi source parts) with >100k parts per year for SDRAM and >500k parts per year for DDR.

A re-labeller is a nice name for an outfit that takes known bad batches of parts, re-labels them and then sells them.

Cheers

PeteS

Pooh Bear · Answer

Never used the stuff myself ( except in my PC of course ).

I expect that means you have a problem ? I'd expect you need to look at timing issues maybe.

Did you finally manage to work out the volts and amps needed to produce 1 watt in an 8 ohm speaker btw ?

Graham

Boki · Answer

Hi All,            Do you ever experience SDRAM not stable in mass production?Best regards,Boki.

Boki · Answer

ya ... timing... but seems in a correct range...For speaker problem, I remember I had ansewrd you alrady, isn't it ?Best regards,Boki."Pooh Bear"  ???????:

Pooh Bear · Answer

I hadn't seen that post. Yes 2.8V is correct. How is that project going ?Graham

Boki · Answer

Thank you very much for advice.I am still finding the problems...Best regardsBoki."PeteS"  ???????:

Boki · Answer

Thanks.um... that project is stop moving.we are going on some other interesting, I will keep questioningly... soon.:)Best regards,Boki."Pooh Bear"  ???????:

Mac · Answer

What are the symptoms?--Mac

Boki · Answer

I have find out the root cause, when we add bead for EMI / ESD, we increase the rising / falling time on SDRAM data pin.

I remember the ESD test will fail when the ESD test signal comes from memory card slot(so we add those beads/resistors), but I can't sure they are for EMI or ESD.

btw, the problem is timing, but it seems that do not to change the layout now, or we have to re-test the EMI/ESD/XXX/@@@, how do you think change a high speed SDRAM directly? any other ideal?

Thank you very much!

Best regards, Boki.

Boki · Answer

ha, that project is running again. ;)

SDRAM stable ?

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