The STMicroelectronics M24C64-FDW5TP is a 64Kbit serial EEPROM with an I²C interface, organized as 8K × 8 bits.
450 ns access time — bus timing headroom
The 450 ns access time defines the read cycle from the memory array to the I²C bus. At 1 MHz clock, this allows the host controller to clock data without wait states.
5 ms write cycle — planning page writes
The 5 ms write cycle time per word or page means the host must wait after each write command before polling the acknowledge. For systems that write calibration data at power-up, this delay is acceptable; for high-frequency data logging, a larger page buffer or a different memory technology would be needed.