M34E02

The M34E02 is a 2 Kbit serial EEPROM memory able to lock permanently the data in its first half (from location 00h to 7Fh). This facility has been designed specifically for use in DRAM DIMMs (dual interline memory modules) with Serial Presence Detect. All the information concerning the DRAM module configuration (such as its access speed, its size, its organization) can be kept write protected in the first half of the memory.

This bottom half of the memory area can be writeprotected using two different software write protection mechanisms. By sending the device a specific sequence, the first 128 bytes of the memory become write protected: permanently or resetable. In addition, the device allows the entire memory area to be write protected, using the WC input (for example by tieing this input to V_CC).

These I2C-compatible electrically erasable programmable memory (EEPROM) devices are organized as 256x8 bits.