4017 Decade Counter IC

Pin Number

Pin Name

Description

1 to 7 and 9,10,11

Output pins Q0 to Q9

These are the 10 output pins on which the counting occurs, they are not in order hence verify pin diagram above

8

Vss or Ground

Connected to the Ground of the circuit

12

Carry Out (CO)

This pin goes high after the IC counts from 1 to 10. This is used as carry while counting.

13

Clock Enable (EN)

This is an input which when made high will hold the count at the current state

14

Clock

The counting happens when this clock pulse goes high , this pin is normally connected to 555 timer or other uC to produce a pulse

15

Resets

As the name suggests this pin resets the count back to 1

16

Vdd / Vcc

Connects to the supply voltage typically +5V