32X8 SRAM Replacement

[Uriah]

I need to replace a SRAM chip on a piece if test equipment it is a
HM62256ALP-8. A 28 pin DIP. It is a 32X8 Hi-Speed SRAM. Can I
replace this with any 28 pin SRAM chip or do I need to find an exact
replacement or an exact cross reference. Is this like DDR memory in a
computer where you can buy what ever is selling at CompUSA? I think I
have some chips that are the right speed but trying to find info on if
they would work doesn't seem to be that easy. So I thought I would
ask you guys.

Thanks so much
Russ

 

[David L. Jones]

"Uriah" <uriahsky@hotmail.com> wrote in message
news:a72e3cd2-e526-4620-b176-4937d4e74686@x29g2000prf.googlegroups.com...

I need to replace a SRAM chip on a piece if test equipment it is a
HM62256ALP-8. A 28 pin DIP. It is a 32X8 Hi-Speed SRAM. Can I
replace this with any 28 pin SRAM chip or do I need to find an exact
replacement or an exact cross reference.

No, not usually.

Is this like DDR memory in a
computer where you can buy what ever is selling at CompUSA?

Yes, pretty much. The 62256 is a bog standard device with countless working
sustitutes.
Was common in computer cache memory many years ago, which were a good (free)
source for these chips after computers were scrapped.
At the peek of the market for these devices there was even a scam that
substituted fake cache SRAM chips and doctoring the BIOS to show they were
working when in fact they were empty chips.

I think I
have some chips that are the right speed but trying to find info on if
they would work doesn't seem to be that easy.

Just match or better the speed and you should be fine.

Dave.

 

[whit3rd]

On Mar 18, 9:15 pm, "David L. Jones" <altz...@gmail.com> wrote:

"Uriah" <uriah...@hotmail.com> wrote in message

news:a72e3cd2-e526-4620-b176-4937d4e74686@x29g2000prf.googlegroups.com...

I need to replace a SRAM chip on a piece if test equipment it is a
HM62256ALP-8.  A 28 pin DIP.  It is a 32X8 Hi-Speed SRAM.  Can I
replace this with any 28 pin SRAM chip or do I need to find an exact
replacement or an exact cross reference.

No, not usually.

Is this like DDR memory in a
computer where you can buy what ever is selling at CompUSA?

Yes, pretty much. The 62256 is a bog standard device with countless working
sustitutes.
Was common in computer cache memory many years ago, which were a good (free)
source for these chips after computers were scrapped.

All the above is true, BUT there are package differences, while "DDR"
is in
a known socketable type of package. DIP with .300" width, and .with .
600"
width, and in various surface mount types, are all available.
The old '386 motherboards used mainly .300" DIP packages.