Are these suitable for cache RAM?

[Chuck(G)]

I noted that Electronics Goldmine has a shipment of these 32KB 45 nsec SRAMs. Are these of use to anyone looking for cache SRAM for their 386/486 boards? Just wondering...

G27766 ~ Rare MOSEL MS62256A-45NC 32K x 8 High Speed Static RAM

MOSEL MS62256A-45NC is a 45ns access time 32K x 8 CMOS Static RAM in a thru-hole narrow type 28 pin Dip. Original MOSEL Part - New!

theelectronicgoldmine.com

 

[Timo W.]

With 45ns? No. You normally need 25 or 20ns and the one for tag should be another 5ns faster.

 

[Chuck(G)]

That's kind of what I thought. I've got several 32KB "skinny DIP" SRAMs, but can't recall why I have them.

 

[rmay635703]

In theory that should be good for 20mhz right?

Kind of an odd speed grade, unless it really overclocks many FPMs can cycle that fast (after the initial read on burst)

 

[Chuck(G)]

I can remember a time, not that long ago, when 45 nsec was the exclusive domain of bipolar RAM.

 

[Eudimorphodon]

In my parts drawer have a few Cypress 35ns ones like this I got somewhere. They might not be fast enough for cache RAM, but they're fantastic for 8-bit breadboard/homebrew projects. I used one of them plus a 74LS04 to turn my 16K TRS-80 into a 48K one. $5 doesn't seem like that great of a price, though, considering Digikey has a 25ns Renesas equivalent for $4.14. (With the warning that it's an obsolete part limited to stock on hand. The 15ns one which claims to be an ongoing concern is $7.41.)

(*) I checked, I guess I got them from Jameco. Currently $3.95.

 

[Chuck(G)]

Well, Goldmine's thing is NOS and antique parts. For example, they're offering Intel 8032 MCUs and TO-100 LM723s.