This counter performs the same function as the 4020, but includes an internal oscillator. The basic use for this device is shown in Figure bellow. There are three options for external oscillators using a crystal and RC network. If the RST input is "1” all the outputs go to There are no outputs for the stages 2, 4, 8, and 2048. The maximum input frequency is 8 MHz when the circuit is powered from a power supply of 10 V.