any suggestions on which IC might be used as a 2bit counter. keeping in mind that costs are of concern, so if a 8bit counter is 50% less expensive than the 2bit version i will use the 8bit chip, etc.

the intended use is to watch for the "signal" followed by a "reset" signal. if the "reset" is not seen for two ups of the "signal" (a binary "2") then a red LED will latch on. "signal" and "reset" are pulse widths that varies in the 2-100ms range.

edit- am looking at this dual 4bit counter 74HC393, but this is negative clock edge. i found this nifty counter, can be programeed for hi-to-lo or lo-to-hi triggering HEF4520B.

thanks.

 

How about a dual flip-flop? That would be a 74HC74.