The Microchip 24LC512-I/MF is a 512 Kbit serial EEPROM with an I²C interface, organized as 64K x 8 bits. The 400 kHz clock frequency is standard Fast Mode I²C, so any MCU with a hardware I²C peripheral can talk to it directly — no bit-bang needed. Access time is 900 ns, but on a 400 kHz bus the bus itself is the throughput bottleneck, not the memory array.
If you are running a battery-backed system that drops to 2.5 V, this part stays alive.
Write cycle time and memory endurance
The write cycle time is 5 ms for a word or page write.
Package and mounting — what to tell the layout engineer
The 24LC512-I/MF comes in an 8-DFN Exposed Pad package, supplier device package 8-DFN-S (6x5 mm). It is a surface-mount part.