15 Jul
2013
15 Jul
'13
9:15 p.m.
On 07/15/2013 06:36 PM, Josh Dersch wrote:
I've put a picture up at:
http://yahozna.dyndns.org/scratch/imlac/fake7475-full.jpg
I was paranoid after you mentioned the "7574" thing that perhaps I had
gone insane (or become dyslexic) and had spent an hour last night
misreading a chip label, but no, it's clearly labeled as an SN7475N with
TI branding :).
Well, to my eye, it looks like no TI chip that I've ever seen. In my
plain-jane SN74xxx (not LS, S, etc.) collection from the 70s, the TI
packages that I have do not have pin 1 "dots", but the usual rectangular
relief on the pin 1 end. Your package looks more like a Motorola
bug--particularly the "fuzzy" pin 1 depression.
I believe you've got a forgery. On the clumsier forgeries, paint is
applied over the old marking and then the labeling. You might see if
that's the case with your chips.
--Chuck
