74HC595 Serial to Parallel Shift register
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The 74HC595 is a high-speed Si-gate CMOS device (pin compatible with low power Schottky TTL).
The “595” is an 8-stage serial shift register with a storage register and 3-state outputs. The shift register and storage
register have separate clocks. Data is shifted on the positive-going transitions of the SHCP input. The data in each register is transferred to the storage register on a positive-going transition of the STCP input. If both clocks are connected together, the shift register will always be one clock pulse ahead of the storage register.
These chips are commonly used to create an additional 8 logic output ports for microcontrollers.
See the Arduino Tutorial Serial to Parallel Shifting-Out with a 74HC595
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