Figure bellow shows how the flip-flops of a 4027 can be connected to perform a divide-by-5 counter [odd division]. The output isn't a perfect square wave since the duty cycle isn't 50 percent. The circuit needs some additional logic using a gate of the 4001 as shown in the figure. Additional logic can also be included to perform sequential outputs. Three flip-flops are needed and the maximum input frequency depends on the power-supply voltage.
Divide-by-5 Counter
