24-Stage Frequency Divider - CD4521
CD4521 24-Stage Frequency Divider
Consists of an oscillator section and 24 ripple-carry binary counter stages. The oscillator configuration (using IN1) allows design of either RC or crystal oscillator circuits. IN1 should be tied either HIGH or LOW when not in use. A HIGH on the RESET causes the counter to go to the all-0's state and disables the oscillator. The count is advanced on the negative transition of IN1 (and IN2).
Description above from Texas Instruments, see data sheet for more information - https://www.ti.com/lit/ds/symlink/cd4521b.pdf