10 Jul
2007
10 Jul
'07
12:44 p.m.
I recently came across a stock of what seems to be 16 bit wide memory =
chips.
But I'm getting nowhere trying to find a data sheet. Can anybody help =
out?
=20
The parts are UM61M512K-15, 32 pins DIP. The logo is round, world =
I doubt they're 16 bits wide. The '512' in the part number would suggest
512KBits, or 32K 16 bit words.
Now, unless I am missing something, a 32K-location RAM would need 15
address lines. Along with 16 data lines, a write-enable, a chip select
line, power and ground. That's over 32 pins.
My guess is that they're 64K*8 bits.
Thw logo sounds like UMC, who made a lot of chips that ended up in PCs. I
have their microprocessor+peripherals databook from about 1990, but
nothing on their RAMs.
-tony