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Microchip delivers EEPROM for DDR4 SDRAM modules

23 Apr 2014

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Microchip Technology Inc. has unveiled a 4Kb I2C Serial Presence Detect (SPD) EEPROM device—the 34AA04. This device is specifically designed to work with Double Data Rate 4 (DDR4) SDRAM modules used in high-speed PCs and laptops, while also supporting older DDR2/3 platforms.

This device is designed for the price-competitive consumer products market and is capable of operation across a broad voltage range (1.7V to 3.6V). This device is JEDEC JC42.4 (EE1004-v) Serial Presence Detect (SPD) compliant and is designed to be compatible with DDR4 SDRAM modules. The 34AA04 includes reversible software write protection for each of four independent 128 x 8bit blocks and supports a new SMBus compatible bus time out. The device features a page write capability of up to 16B of data and three address pins allow up to eight devices on the same bus.

The 34AA04 is backward-compatible with existing DDR2 and DDR3 SPD EEPROMs. To ensure backward compatibility, the memory array of the 34AA04 is divided into two separate 256byte banks to overlay with the architecture of older SPD EEPROM devices. The 34AA04 serves a wide range of applications in the consumer electronics market (e.g., PCs, laptops, graphic cards), among others.

"The reversible software write-protect on four individual blocks, faster data rates, and SMBus compatibility offer DRAM manufacturers added flexibility to enable new features in the high-speed PC, laptop and graphic card markets," said Randy Drwinga, vice president of Microchip's Memory Products Division.

The 34AA04 devices are available for sampling and volume production, in 8pin SOIC, TDFN, UDFN, TSSOP and PDIP packages. They are supplied in 10,000 unit quantities.

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