On Tue, Feb 27, 2018 at 5:44 PM, Ethan Dicks via cctalk <cctalk@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.
