The CD4021BC is an 8-stage parallel input/serial outputshift register. A parallel/serial control input enables individualJAM inputs to each of 8 stages. Q outputs are availablefrom the sixth, seventh, and eighth stages. All outputs haveequal source and sink current capabilities and conform tostandard “B” series output drive.When the parallel/serial control input is in the logical “0”state, data is serially shifted into the register synchronouslywith the positive transition of the clock. When the parallel/serial control is in the logical “1” state, data is jammed intoeach stage of the register asynchronously with the clock.All inputs are protected against static discharge with diodesto VDD and 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
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