STMicroelectronics M24256E-FDW6TP, 256kB EEPROM Memory Chip, 450ns 8-Pin TSSOP8 I2C

The STMicroelectronics M24256E-F is a 256-Kbit I2C-compatible EEPROM (electrically erasable programmable read only memory)organized as 32 K x 8 bits. It offers an additional page of 64 bytes, named identification page, which can be used to store sensitive application parameters which can be (later) permanently locked in read-only mode.

Random and sequential read modes
Write protection of the whole memory array
Configurable device address
Preprogrammed device address (on demand)
Enhanced ESD or latch-up protection
More than 4 million write cycles
More than 200-year data retention