On 16/02/2011 13:55, Carey Fisher wrote:
>   Thanks for all the suggestions on finding/replacing an obsolete 256kx1 =
SRAM
> for ongoing production.  It is indeed an SOJ package.  Mike's correct abo=
ut
> redesign - the x8 chips are cheaper.  But I have to fit the replacement p=
art
> into a circuit that has separate DIn and Dout lines.  I know this can be
> handled with additional logic but that's a bigger job than just changing =
a
> chip and it's pinout.  If none of the gray market suppliers comes thru, I=
'm
> going with a 256kx4 Cypress part that's still in production, matches the
> existing control signals and timing but is very expensive.  Once this bat=
ch
> of product gets into production, I'm going to redesign the whole thing si=
nce
> the product is several years old and I'm sure I can shrink it and make it=
 a
> lot cheaper with parts available now.
> Carey Fisher

I somehow missed the x1 part in my haste to reply last time, doh.. :-)
Anyway, Bristol seem to have 25 of CYC197-25VC in stock (which I believe=20
is the SOJ version), and Inland Empire may have or can source some -=20
others just have the DIP version from what I can see.
Does seem you may be able to get hold of a few at least according to=20
find chips, I'd maybe hold off ordering the x4 part until you confirm=20
they can't get any (though if this is the case it would be a decent=20
compromise then redesign with x8 when you can)



--=20
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