CMOS counter/divider 4017 datasheet
4017 IC is a CMOS counter/divider integrated circuit, actually a decada counter with 10 decode ouputs. It is 5 stage Johnson counters having 10 decoded outputs. Inputs include a clock, a reset, and a clock inhibit signal.
Schmitt trigger action in the clock input circuit provides pulse shaping that allows unlimited clock input pulse rise and fall times.