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The 74HC595 is a 8 bit serial to parallel shift register. It is exceptionally useful when you need to expand your inputs. This allows you to convert 1 serial byte into 8 outputs. The 74HC595 also allows you to cascade these devices for more bits. You will need three pins, serial, serial clock, and a latch.

Spec Sheet: http://www.ti.com/lit/ds/symlink/sn74hc595.pdf

alt-Spec Sheet: http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00000339.pdf

alt-Spec Sheet: http://www.onsemi.com/pub_link/Collateral/MC74HC595A-D.PDF

Voltage In: 2V ~ 6V

Supply Current: <80uA

Current Output (Max): mA

Output Type: Tri State