Integrated Circuit

CD4022BC Divide-by-8 Counter/Divider with 8 Decoded Outputs

The CD4017BC is a 5-stage divide-by-10 Johnson counter with 10 decoded outputs and a carry out bit.

The CD4022BC is a 4-stage divide-by-8 Johnson counter with 8 decoded outputs and a carry-out bit.

These counters are cleared to their zero count by a logical “1” on their reset line. These counters are advanced on the positive edge of the clock signal when the clock enable sig- nal is in the logical “0” state.

The configuration of the CD4017BC and CD4022BC per- mits medium speed operation and assures a hazard free counting sequence. The 10/8 decoded outputs are nor- mally in the logical “0” state and go to the logical “1” state only at their respective time slot. Each decoded output remains high for 1 full clock cycle. The carry-out signal completes a full cycle for every 10/8 clock input cycles and is used as a ripple carry signal to any succeeding stages.