Another advantage is the wide density range of the I²C protocol, ranging from 128 bits to 1 Mbit. An I²C device also features a smaller die size for a specific density which allows for a lower cost per density and smaller physical dimensions. Many I²C devices have a WP pin that prevents writes to the array when activated which can be used to prevent unwanted writes during power up and power down. Finally, many I²C EEPROMs include address pins as an easy way to have multiple EEPROMs on a single bus while still only using two connections to the microcontroller (MCU).