The data sheet also lists the delays through the part. Ask us if you need any specifics.
For example, the delay from input to output is as much as 600ns per part, with a 5V supply, at 25C. At higher temperatures it would be even slower. For two parts cascaded, it adds up to about 1us. At 2MHz, that's twice your cycle time! Like most CMOS parts, they get faster if you use a 10V or 15V supply, but then the input thresholds and output levels change. These CD4xxx parts are about the slowest logic devices around that you can get in an IC. Anything else would be faster. Don't forget they were the very first commercially available CMOS devices, soon after RCA invented CMOS (or as they called it, COSMOS). CMOS was truly in its infancy. Andy -- Author: Ingraham, Andrew INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
