STMicroelectronics 512-byte SPD EEPROM

The M34E04B is a 512-byte EEPROM device, operating on the SMBus in a 1.7 V - 3.6 V voltage range, with a maximum transfer rate of 1 MHz in the 2.2 V - 3.6 V range, over a JEDEC-defined ambient temperature of 0°C to 95°C. It features a 4-Kbit serial EEPROM, organized into two 256-byte pages, or 512 bytes of total memory, with each page composed of two 128-byte blocks. The device allows selective data locking in any or all of the four 128-byte blocks, designed for use in DRAM DIMMs with Serial Presence Detect. It's protocol-compatible with the previous 2-Kbit generation, M34E02, enabling commands used with legacy devices to be applied to the lower or upper pages of the EEPROM.

• 512-byte SPD EEPROM: JEDEC EE1004 compliant
• SMBus interface: Up to 1 MHz transfer rate
• EEPROM memory: 4 Kbits, two 256-byte pages, each with two 128-byte blocks
• No hardware write protection
• Software data protection per 128-byte block
• Byte Write: Within 5 ms
• Page Write: 16 bytes within 5 ms
• Schmitt trigger on bus inputs
• Noise filter on bus inputs
• Single supply voltage: 1.7 V to 3.6 V
• Operating temp range: 0°C to 95°C
• Enhanced ESD/latch-up protection
• Write cycles: Over 4 million
• Data retention: Over 200 years
• Package: RoHS-compliant, halogen-free, 8-lead ultra thin fine pitch dual flat no lead (ECOPACK2)