Shop OBEX P1 Docs P2 Docs Learn Events
Help understanding this EEPROM — Parallax Forums

Help understanding this EEPROM

bambinobambino Posts: 789
edited 2010-06-17 15:08 in General Discussion
Memory Organization AT24C512, 512K SERIAL EEPROM: The 512K is internally organized as 512 pages of
128-bytes each. Random word addressing requires a 16-bit data word address.
It says first that it is 512k eeprom, then it says 512 pages of 128 bytes which is 64k bytes. Can someone shed some light on this?

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2010-06-17 14:56
    The EEPROM manufacturer's marketing departments started, early in the development of PROMs/EPROMs/EEPROMs, to advertise these in terms of the number of bits provided. This unfortunate practice has continued to the present. You have to be very careful to separate how the EEPROMs are labelled, how the part numbers are provided, from the description of how many 8-bit bytes are provided.

    A 256K bit EEPROM contains 32K bytes
    A 512K bit EEPROM contains 64K bytes
    A 1024K bit EEPROM contains 128K bytes and, because of how I2C EEPROMs are implemented, appears like 2 - 64K EEPROMs.
  • bambinobambino Posts: 789
    edited 2010-06-17 15:08
    Thanks Mike,

    What's really bad is I remember you answering that for someone else before. I just couldn't remember what you had said!
Sign In or Register to comment.