Dwight wrote: Even if they did expect a simple CMOS part, they'll still be disappointed, because the MC4004 is a TTL part! Motorola had a 4000 series of TTL parts before the SN7400 series became established. So when they introduced their equivalent of the RCA CD4000 series CMOS, they called it the MC14000 series. I can't find any reference to a CD4004 at the moment, but if there was one, and Motorola made an equivalent, they would have called it an MC14004. I've seen this problem occur more often when someone wants a CD4024 and gets an MC4024, or vice versa. The former is seven stage binary counter, but the latter is a dual VCO. Eric