CD4021BE 8bit Shift Register (parallel to serial)

Texas Instruments
ELCD4021B
€1.21

CD4021 is a cascadable 8bit parallel to serial shift register (basically the inverse of the 74hc595).

Sometimes you'll end up needing more digital input than the pins on your microcontroller board can readily handle. Using a parallel to serial shift register allows you collect information from 8 or more switches while only using 3 of the pins on your microcontroller.

By the way, this is the IC you need for Arduino ShiftIn function.

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Applications:

  • Parallel input/serial output data queueing
  • Parallel to serial data conversion
  • General-purpose register
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