27 Feb
2018
27 Feb
'18
10:40 p.m.
On Tue, Feb 27, 2018 at 5:44 PM, Ethan Dicks via cctalk
<cctalk at classiccmp.org> wrote:
Hi, all,
I'm going through a box of random ICs and one particular item is not
showing up on my searches outside of a couple eBay auctions for chip
collectors.
The IC is a 20-pin ceramic body with side brazed legs, gold pins, chromed
lid, with NEC D2168D on it with "-2" painted on the ceramic and date codes
from 1984. It's almost certainly a RAM chip of some kind, but I'm not
finding any pinouts or data sheets.
Anyone recognize this? Anyone know a system that uses them? I have more
than 10, and since I haven't run across them before, I probably don't have
a machine that needs them.
Thanks for any tips.
-ethan
Msg title says D2167D, msg body says D2168D. Assuming D2167D is
correct, an NEC uPD2167 is a 16Kx1 SRAM in a 20-pin DIP package.
Separate data in and data out pins, 14 address pins, /CS and /WE
pins. The uPD2167-2 has a 70ns access time, the uPD2167-3 has a
55ns access time.
A search for uPD2167 should turn up datasheets.