3 Sep
2012
3 Sep
'12
10:08 a.m.
For the 6809, I've seen masks P6F, T5A, CW3, and
C65P.
For the 6809E, I've seen masks T6R and EN6, but I'm pretty sure there is
one earlier and one later one.
...
Seems likely that it's mismarked. Is the part in a plastic DIP?
Normally all "E" parts would have a second letter for the package, so
it's possible that this was a non-E part where the mismarking error was
to use "E" as a package code instead of "P" or "L".
On the other hand, I haven't seen a TA6 mask code before. Based on the
date codes, it could be that the TA6 mask set for the "E" part might
correspond to the C65P mask set for the non-"E".
I figured mismarking was the most like scenario. But just to make
things even a little more confusing, the 68B09E that I had been using
before it gave up the ghost, and that was quite happy with externally
generated E and Q, has a mask code of C65P. It's date code is
QETD0148. All 3 are plastic and none have a suffix beyond the E.
The good news is that the only reason I had designed the boards to use
the E parts was that they were easier to get. So pulling the 74LS76
and adding a few patch wires is easy enough to get them working. It
makes me think if I do another turn of the board, I should add some
jumpers to let one use either.
BLS