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The AT24C256 EEPROM is an 8-pin, 32-Kbyte Electrically Erasable Programmable Read-Only Memory Integrated Chip that stores data and information even when the power is turned off. It functions similarly to a pen drive. If necessary, the information on this IC can be rewritten or retrieved.
The wide range of operating voltage of AT24C256 EEPROM is from 1.7 Volts to 5.5 Volts, which can be used as an ideal EEPROM in both 3.3 Volts and 5 Volts systems. The storage space of this IC is 32 Kbyte Or 256Kbit and it is possible to cascade 8 similar EEPROM chips for expansion.
More specs:https://www.utmel.com/componen....ts/at24c256-two-wire