thank Gusse,

i replaced data address (I: in this case) by WORD . . and/or change R from 10K to 6K. ..it doesnot work.

(in the data sheet of 24lc256 dooesnot mention anything data address.

VOLTAGE drop across: R_SCL (10K or 6K) : ~5V (unchanged)
R_SDA (10K or 6K): ~2.5V

!! is it possible the EEPROM: DEATH??