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'[PIC]: [OT]: External SRAM on PIC (or AVR)'
2000\06\02@090914 by Bennett, Matt

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I have found 128Kx8 SRAMs, or at least evidence of their existence, but I
can't seem to find any in stock (or at least with a <8 week delivery time).
I think I'm going to have to use 2 32K*8 SRAMs and use a little bit of
decoding logic.  Digikey has some Toshiba 128K parts in stock, but they
aren't fast enough to operate without a wait state (on the AVR).  Pioneer
appears to have some 62C256 parts from ISSI.  (for now)

Matt

{Original Message removed}

2000\06\02@095538 by goflo

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JDR Microdevices had 64KX8 SRAM last time I looked.

regards, Jack

2000\06\02@111927 by Bennett, Matt

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My own mistake there, I misread the data sheet and thought they were
incompatible- the /OE and /RD are, in fact, the same thing.  I'm going to
have to overlap the internal and external memory, since I want to get as
much RAM on the device as I can.- I lose 608 RAM locations, Oh well...  I've
decided to use 2 32Kx8 parts- the address decoding is simple- just an
inverter.  Unfortunately the 62C256 only has a /CS input- some other SRAMS
(which either I can't get in time, or aren't fast enough) have both a /CS
and a CS, so the inverter would be unnecessary.  This design is low volume,
so having an extra gate is not a terrible thing.

Matt
{Original Message removed}

2000\06\02@121932 by Dan Michaels

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Matt Bennett wrote:
>I have found 128Kx8 SRAMs, or at least evidence of their existence, but I
>can't seem to find any in stock (or at least with a <8 week delivery time).
>I think I'm going to have to use 2 32K*8 SRAMs and use a little bit of
>decoding logic.  Digikey has some Toshiba 128K parts in stock, but they
>aren't fast enough to operate without a wait state (on the AVR).  Pioneer
>appears to have some 62C256 parts from ISSI.  (for now)
>

Jameco has both fast Cypress 32Kx8 SRAMs [0.3"] and the slower
std 0.6" type. Also, if you have a spare line on your AVR you can
separate the /CS lines for the 2 SRAM chips and forgo the need for
external decoding logic.

Cheers,
- Dan Michaels
Oricom Technologies
===================

2000\06\02@145454 by Dan Michaels

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Matt Bennett wrote:
>I have found 128Kx8 SRAMs, or at least evidence of their existence, but I
>can't seem to find any in stock (or at least with a <8 week delivery time).
>I think I'm going to have to use 2 32K*8 SRAMs and use a little bit of
>decoding logic.  Digikey has some Toshiba 128K parts in stock, but they
>aren't fast enough to operate without a wait state (on the AVR).  Pioneer
>appears to have some 62C256 parts from ISSI.  (for now)
>

Also, checkout the SRAM modules sold by  http://www.accutekmicro.com

Cheers,
- Dan Michaels
Oricom Technologies
===================

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