Avago just made it to my permanent fecal roster.

A few years back an obsolescence notification came out on the HCTL-1100
general purpose motor control IC. It said that the HCTL-1101 would be a
drop-in compatible alternate. The data sheet looked identical to the
original (substitute 1101 for 1100)...

I finally got to look at real silicon for the 1101 and found that the motor
would not even power-up. About this point, Avago released a new obsolescence
notice saying that the 1101 had been found to not be equivalent. In as many
words, they said that the product was being offered only as-is and no
further support would be available. No work-arounds or anything!

Evidently, there is an ASIC available from Mektronics
http://mektronixtech.com/ that is largely compatible with the original
HCTL-1100. Even has some performance improvements for new software.

Has anybody tried this ASIC or is aware of any other options for the 1100? I
have a legacy design that we are trying to avoid re-engineering.

Thanks - Oppie