用英文总结该文件内容，Describe the features and characteristics of the products in the document.
The HCF4021B is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology. It functions as an 8-stage parallel or serial input/serial output register featuring common CLOCK and PARALLEL/SERIAL CONTROL inputs. Each register stage is a D-type, master-slave flip-flop, with buffered outputs available from stages 6, 7, and 8.
| CLOCK RATE | 12 MHz (Typ.) |
|---|---|
| Supply Voltage | 3 to 20 V |
| Operating Temperature | -55 to +125 °C |
| Quiescent Current (Max) | 3000 µA |
| Input Leakage Current | ±10 µA |
| Packages | DIP and SOP |
The device is an 8-stage parallel or serial input/serial output register.
Yes, the device supports fully static operation.