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'[EE] Help finding part'
2011\02\15@121842 by Carey Fisher

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We've been producing a product for a few years and now one of the parts is
obsolete.  While I'm modifying the design, does anyone know of a stash of
CY7C197 Static RAM?  It's a 256k x 1 async part.  Really need SOIC but will
adapt any other package if needed.

Alternatively, can anyone suggest a different 256k x 1 static RAM that may
still be available?

Thanks,
Carey Fisher
Chief Technical Officer
New Communications Solutions, LLC
678-999-3956
spam_OUTcareyfisherTakeThisOuTspamncsradio.co

2011\02\15@122851 by William Couture

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On Tue, Feb 15, 2011 at 12:18 PM, Carey Fisher <.....careyfisherKILLspamspam@spam@ncsradio.com> wrote:

> We've been producing a product for a few years and now one of the parts is
> obsolete.  While I'm modifying the design, does anyone know of a stash of
> CY7C197 Static RAM?  It's a 256k x 1 async part.  Really need SOIC but will
> adapt any other package if needed.

http://www.findchips.com shows them available from several sources, including
Mouser.

Findchips does not let me check for SOIC, however.  You'll need to follow
the links.

Bill

-- Psst...  Hey, you... Buddy...  Want a kitten?  straycatblues.petfinder.org

2011\02\15@123407 by Oli Glaser

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On 15/02/2011 17:18, Carey Fisher wrote:
> We've been producing a product for a few years and now one of the parts is
> obsolete.  While I'm modifying the design, does anyone know of a stash of
> CY7C197 Static RAM?  It's a 256k x 1 async part.  Really need SOIC but will
> adapt any other package if needed.
>
> Alternatively, can anyone suggest a different 256k x 1 static RAM that may
> still be available?
>

Not sure if this helps much, but I think ISSI do a SOIC 256k SRAM. We are using a 1MB part from them, IS61LV6416, I'm pretty sure I saw 256 and 512k versions when I was looking for it (quite) recently.

2011\02\15@124023 by Oli Glaser

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Just looked on RS and ISSI do make a 256k part, IS62C256AL:

http://uk.rs-online.com/web/search/searchBrowseAction.html?method=retrieveTfg&Ns=stockPolicy_uk|1||new_uk|1&Ne=4294960712&Nr=AND(avl:uk,searchDiscon_uk:N)&N=4294612429+4294611775+4294743309+4294610474&binCount=121&multiselectParam=4294612429%204294611775&selectAttribute=256KBit#breadCrumb <http://uk.rs-online.com/web/search/searchBrowseAction.html?method=retrieveTfg&Ns=stockPolicy_uk%7C1%7C%7Cnew_uk%7C1&Ne=4294960712&Nr=AND%28avl:uk,searchDiscon_uk:N%29&N=4294612429+4294611775+4294743309+4294610474&binCount=121&multiselectParam=4294612429%204294611775&selectAttribute=256KBit#breadCrumb>

2011\02\15@130117 by jim

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Carey,

These are Cypress parts.  You might be able to get one as a sample from
their website.
Here is the link=> www.cypress.com/?id=87&addcols=&parametric=html&filter_189=256
And they come in an SOJ package.  
Regards,

Jim

> ---{Original Message removed}

2011\02\15@131449 by Mike Harrison

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On Tue, 15 Feb 2011 11:01:14 -0700, you wrote:

>
> Carey,
>
> These are Cypress parts.  You might be able to get one as a sample from
>their website.
> Here is the link=>
>www.cypress.com/?id=87&addcols=&parametric=html&filter_189=256
> And they come in an SOJ package.  
>
> Regards,
>
> Jim
>
>> ---{Original Message removed}

2011\02\16@085552 by Carey Fisher

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Thanks for all the suggestions on finding/replacing an obsolete 256kx1 SRAM
for ongoing production.  It is indeed an SOJ package.  Mike's correct about
redesign - the x8 chips are cheaper.  But I have to fit the replacement part
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 batch
of product gets into production, I'm going to redesign the whole thing since
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 Fishe

2011\02\16@134319 by Oli Glaser

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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 about
> redesign - the x8 chips are cheaper.  But I have to fit the replacement part
> 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 batch
> of product gets into production, I'm going to redesign the whole thing since
> 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 is the SOJ version), and Inland Empire may have or can source some - 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 find chips, I'd maybe hold off ordering the x4 part until you confirm they can't get any (though if this is the case it would be a decent compromise then redesign with x8 when you can)

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