10 Aug
2007
10 Aug
'07
9:32 a.m.
On Aug 10, 2007, at 2:59 AM, Chuck Guzis wrote:
Pick, pick, pick! ;) I will try to be more clear about what I
mean. "Obsolete" means, to me, "no longer of any practical use".
I'd love to get ahold of a few of those. I'll see if I can tack a
few into my next parts order.
-Dave
--
Dave McGuire
Port Charlotte, FL
Farewell Ophelia, 9/22/1991 - 7/25/2007
Well I
guess I define "obsolete" as "useless". That seems to jibe
with the industry definition as well.
So, 1701 EPROMs aren't obsolete? ;-) I assume that some can be found
that are still operable. I've
played with I2C FRAMs, but not byte-wide parts. Are they
easy to program?
Almost exactly like SRAM. You write individual bytes, not the whole
device during a write cycle. Timing for write is about the same as
that for read. The 5V FM1808 (32Kx8) is a 70 nsec part. While not
blazingly fast by modern standards, it's good enough for most
"vintage" designs. Ramtron gives the number of read/write cycles as
being in excess of a trillion. Depending on your decoding logic for
WE\, you could use the same part for RAM and ROM. I've got a couple
here and I like them very much. 28-pin DIP package.