HCF4521B
DESCRIPTION
The HCF4521B is a monolithic integrated circuit, available in 16-lead dual-in-line plastic package and plastic micro 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 device added flexibility.
PIN CONNECTION
February 1999
1/12
HCF4521
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING
Symbol VDD
- Vi II Ptot Supply Voltage Input Voltage DC Input Current (any one input) Total Power Dissipation (per package) Dissipation per Output Transistor for Top = Full Package Temperature Range Operating Temperature Storage Temperature Parameter Value -0.5 to +18 -0.5 to VDD + 0.5 ± 10 200 100 -40 to +85 -65 to +150 Unit...
