A friend of mine who often repairs old lab stuff has run into some board on which he has some Philips part, PCF4500WP in plcc44. The crystal is at pins 7 and 8. That is all the info he gave me when he asked me - and I know nothing about it. Perhaps someone here would have some info - datasheet or whatever, I'll just forward it to him.
I expect you already did a Google search and found the same thing I did, nothing. I see the number shows up on a site where you can try to get quotes, so they acknowledge that it existed and the time frame is right.
It is not very often that a part goes so totally missing like this unless it was some sort of a custom part perhaps. But then maybe it disappeared from view before the Internet, so no trace left behind.
Philips had a range of 8051 clones at about that era, but I can't seem to find an 8051 pinout with the crystal in that place. And I think they were numbered xx51.
It isn't some wierd second-source of the MC14500B is it? Can't imagine why it would be in a 44 pin package.
The other thing it could be is a Philips ASIC. Is it in a Philips instrument?
The MC14500B seems the best guess so far (I did not know the 14500). He'll probably see the discussion tomorrow (I sent him a link to it on google groups). While I can imagine someone could put that in a plcc in the late 80-s or early 90-s I could not find any reference to such a thing (spent perhaps 15 minutes searching).
We had a large set of Philips databooks in the 90's, with regular updates. Unfortunately, almost all have gone now. But I did find IC25 from 1996. It's for the "16-bit 80C51XA Microcontrollers". In the intro section, there are the telephone numbers for the Bulletin Boards and Fax-on-Demand service, no web address. ;-) And it starts with an overview of all (? can't be sure it's complete) Philips microcontrollers at that time:
80C51 Family CMOS: 80Cxx, 83Cxx, 87Cxx
80CLXXX Family CMOS: 80CLxx, 83CLxx, 85CLxx
8051 Family NMOS: 8051, 8031, 8052, 8032
8400 Family CMOS: 84Cxx
8400 Family NMOS: 84xx
3300 Family CMOS: 33xx
16-bit controllers (68000 architecture): 68070, 93C101, 90CE201
16-bit controllers (XA architecture): XA-G1, XA-G2, XA-G3
Nothing with PCF numbers in there. What I rememeber from that time is that most PFCxxxx chips where (I2C) peripheral chips.
--
Stef (remove caps, dashes and .invalid from e-mail address to reply by mail)
Trouble always comes at the wrong time.
Thanks for all the replies and suggestions. I don't know how far he got, may be he has fixed the device already. He sent me also this a day or two ago (and I forgot to post it):
"The instrument is a Hartmann&Braun O2/CO2 meter URAS10E. A VFC output is connented to pin 6. Pin 13 seems to be serial I/O. Pin 14 seems to be clock for the serial transfer. Other pins looks to be parallel ports."
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