The CD74HC299E is an 8-bit shift register with tri-state capability for its I/O pins (so they can be turned off) that can parallel load. It can be used to extend a microcontroller's input and output pins, can convert bidirectionally between serial and parallel signals, can be chained to increase the bit count, and can be fed into itself to create a ring counter for round-robin signalling or frequency division. And probably many more things! Shift registers are neat.
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