10 Aug
2007
10 Aug
'07
12:31 a.m.
Chuck Guzis wrote:
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.
I still would like to see the 3.3 Volt part used as a *CORE* memory
replacement since I think it has unlimited R/W cycles.
Cheers,
Chuck
I don't dare think about the logic design since I have no idea of just
how to correctly sequence the power and logic levels reliability.
Ben alias Woodelf
PS. A hefty octal relay and a 115NO45 switches my valve amp nicely but I don't
think this design would work for 3.3Volt switching.