HCF4521BM1_1070082

Stresses above those l isted under "Absolute Maximum Rat ings" may cause permanent damage to the devic e. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum ratingconditions for external periods mayaffect device reliability.
* Allvoltage values are referred toV_SS pin voltage.

The HCF4521B is a monolithic integrated circuit, available in 16-lead dual-in-line plastic package and plasticmicro packages.

The HCF4521B have a chain of 24 flip-flops with an input circuit that allows three modes of operation. The input circuit functions as a crystal or an RC oscillator or as an input buffer for an external oscillator. Each flip-flop performs a divide-by-two function giving a total count of 2²⁴=16,777,216. The count advances on the negative going edge of the clock. Access is available to the final seven stages giving the HCF4521B added flexibility.