General Description
●The CD4021BC is an 8-stage parallel input/serial output shift register. A parallel/serial control input enables individ ual JAM inputs to each of 8 stages. Q outputs are available from the sixth, seventh, and eighth stages. All outputs have equal source and sink current capabilities and conform to
●standard “B” series output drive. When the parallel/serial control input is in the logical “0”
●state, data is serially shifted into the register synchronously with the positive transition of the clock. When the parallel/serial control is in the logical “1” state, data is jammed into each stage of the register asynchronously with the clock.
●All inputs are protected against static discharge with diodes to VDDand VSS.
●Features
●■Wide supply voltage range: 3.0V to 15V
●■High noise immunity: 0.45 VDD(typ.)
●■Low power TTL compatibility:
● Fan out of 2 driving 74L or 1 driving 74LS
●■5V–10V–15V parametric ratings
●■Symmetrical output characteristics
●■Maximum input leakage 1 µA at 15V over full temperature range
