Description: If you need a lot of inputs and/or outputs, this is your solution! The Mux (Multiplexer) Shield II adds the capacity for up to 48 inputs or outputs on the Arduino and Arduino Mega.  The Mux Shield uses TI 74HC4067 analog multiplexers (mux’s) for input functionality and TI 74HC595 shift registers for output functionality. 

Features:

• Control up to 48 Pins from your Arduino!
• Multiple modes:
• Analog Input
• Digital Input
• Digital Output
• Solder Jumpers for Hard-Wired Mode Select
• Arduino Library and Example Code Available

Documents:

• Product Page
• User Guide
• Schmatic
• 74HC595 Data Sheet
• 74HC4067 Data Sheet 
• Arduino Library