What do you mean by pcb's? Oh, printed circuit boards. I was thinking
polychlorinated byphenols. Might be highly toxic. As I burned a few boards a few few weeks ago I was at first alarmed.

I dont have much luck eithier finding data sheets. Try Chip Search first instead of putting in the number into google first. That is search google for Chip search. One of the first few listings are the useful ones. You should get a picture of a person with outstretched arms saying you are powerful.
Probably will not get a data sheet though. You might try to send a bunch of random digital signals at the chip and see if you get any reply. But anyways the odds are probaly less than 1 in 10 billion for each try.

Well, maybee not. Soppose you have 16 pins, and soppose that only 8 pins
need to receive 8 bits in order to respond. So thats 2^(8*8)=2^64<10^20
. Geus its to hard to decifer.