Nxp 4000 series logic devices nxp hef4017bp the hef4017b is a 5 stage johnson decade counter with ten spike free decoded active high outputs q0 to q9 an active low carry output from the most significant flip flop q5 9 active high and active low clock inputs cp0 cp1 and an overriding asynchronous master reset input mrthe counter is advanced by either a low to high transition at cp0 while cp1 is low or a high to low transition at cp1 while cp0 is highwhen cascading counters the q5