74HC4040N vs. CD4040

[rebel]

I have had difficulties with some brands of 74HC4060's (which are
similar to but not identical to the 4040).

In particular, the problem was that in some makers' 74HC4060's, the
built-in oscillator didn't oscillate reliably. I ended up just specing
the good old CD4060 which in my particular case does oscillate
reliably.

I presume the problem ones weren't Toshiba. All the 74HC4040's I've ever used
came from Tosh, and nary a problem.

What I HAVE expereinced recently though was a CD4017 problem. Two prototype
products were built, one with Philips and one TI. No issues. Built ten
pre-prod units with a mixture of ST and ON-Semi 4017's. Four had repeatable
failures in a certain test. Those four had ST 4017's, the six without problems
were the ON-Semi-e quipped.

I hate it when a simple part of a project - in this case a 4017 driving an input
on a 4174 - is manufacturer-dependent.