I find your problem most confusing. Your devices are obviously in working order. I can only think that there must be a conditional difference in the code for a 668 or 669.

The 24C04 and 24C16 both have 16 byte page buffers. So starting at 0x30 you should be able to consecutively write "Mahesh Joshi" without running across a page boundary.

I presume that you have tried 12 individual writes for each character.

Either post the code here, or email me the code.

David.