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Description: Have you run out of I/O pins? This great IC allows the user to expand up to 16 I/O using only two I/O for control! The PCF8575C is controlled through an I2C interface and features 16-bits of quasi-bidirectional input/output pins. Checkout the datasheet for more info!
Dimensions: 1" x 1"
Based on 1 ratings:
Works well, used it to scan a 4x4 keypad & still have 8 I/O pins left over. Interrupt means main program does not have to constantly poll keypad.