9 Aug
2007
9 Aug
'07
11:59 p.m.
On 10 Aug 2007 at 2:29, Dave McGuire wrote:
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.
Cheers,
Chuck