4Kb SPD EEPROM is suited for DDR4 SDRAM modules

14th April 2014

Nat Bowers

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Datasheet

A 4Kb I2C Serial Presence Detect (SPD) EEPROM, designated the 34AA04, has been introduced by Microchip Technology. The device is specifically designed to work with the next generation of Double Data Rate 4 (DDR4) SDRAM modules used in high-speed PCs and laptops, while also supporting older DDR2/3 platforms.

This EEPROM is designed for the price-competitive consumer products market and is capable of operation across a broad voltage range of 1.7-3.6V. The 34AA04 is JEDEC JC42.4 (EE1004-v) Serial Presence Detect (SPD) compliant and is designed to be compatible with DDR4 SDRAM modules. It includes reversible software write protection for each of four independent 128x8-bit blocks and supports an SMBus-compatible bus time out. The device also features a page-write capability of up to 16 bytes of data and three address pins allow up to eight devices on the same bus.

Backward compatible with existing DDR2 and DDR3 SPD EEPROMs, the memory array of the 34AA04 is divided into two separate 256-byte banks to overlay with the architecture of older SPD EEPROM devices. The EEPROM serves a wide range of applications in the consumer-electronic market such as PCs, laptops, graphic cards and other products.

Microchip has supported the DRAM market with SPD EEPROMs in the previous DDR1, DDR2 and DDR3 platforms and the reversible software write-protect on four individual blocks, faster data rates and SMBus compatibility provides DRAM manufacturers with added flexibility to enable new features in the high-speed PC, laptop and graphic card markets.

The 34AA04 EEPROMs are available today for sampling and volume production, in 8-pin SOIC, TDFN, UDFN, TSSOP and PDIP packages.