26 May
2006
26 May
'06
10:18 a.m.
Ethan Dicks schrieb:
I have data sheets on the generic 82C55, what I'm
looking for is
specifically the speed rating for the Mitsubishi 82C55AP-2... the
reason it matters is that the SBC6120 needs a 5MHz part, and many
82C55s are 2MHz.
I haven't found an explicit datasheet for Mitsubishi, but:
typically, the -2 means 2MHz for other manufacturers, and since there
appears
to be a 82c55AP-3 and AP-5 available as out-of-stock part, I suspect
that the
-2 also means 2MHz for Mitsubishi. So you likely got a 2MHz part.
Fortunately,
82c55-5 chips are not so rare (see unicornelectronics, for instance).
--
Holger Veit