8-Stage Static Shift Register with Parallel and Serial Outputs
CD4021 Features:
8-stage static shift register : Counts up to 255.
Parallel and serial inputs/outputs : Flexible data transfer.
High-speed operation : Clock frequency: 10 MHz.
Low power consumption : Maximum 80 μA.
Wide operating range : 4.5V to 15.5V.
Compatibility : TTL (Transistor-Transistor Logic) and CMOS (Complementary Metal-Oxide-Semiconductor).
High output drive capability : 24 mA sink, 16 mA source.
Pinout (16-pin DIP/SOIC/TSSOP):
Inputs:
CLK (Clock) - Pin 1 : Clock input.
PARALLEL DATA IN (P0-P7) - Pins 2-9 : Parallel input.
SERIAL DATA IN (SI) - Pin 10 : Serial input.
Outputs:
PARALLEL DATA OUT (Q0-Q7) - Pins 11-15 : Parallel output.
SERIAL DATA OUT (SO) - Pin 10 : Serial output.
Power:
Vcc (Pin 16) : Positive power supply.
GND (Pin 8) : Ground.
Applications:
Data storage and transfer : Shift register applications.
Digital displays : Display drivers for LEDs or LCDs.
Sequencers : Control and automation.
Frequency dividers : Clock division.
Digital counters : Event counting.
Electrical Characteristics:
Clock frequency : 10 MHz.
Input voltage range : 0V to Vcc.
Output voltage swing : 0V to Vcc - 0.5V.
Propagation delay : 10-30 ns.
Power dissipation : 80 μA per stage