Counter

The Counter is a 4-Bit clock counter/divider. Each successive output from Q0 to Q3 is half the frequency of the previous. When used as a binary word it counts from 1 to 16. There is also an end of count output as RCO, when the counter reaches 16 it sends out a pulse on RCO. Used in conjunction with a Clock VCO and a DAC waveforms can be synthesized.

https://www.lzxindustries.net/products/castle-110-counter/