JEDEC reveals JESD229-2 Wide I/O 2 mobile DRAM standard

JEDEC reveals JESD229-2 Wide I/O 2 mobile DRAM standard

Technology News |
By eeNews Europe

Combined, the characteristics position Wide I/O 2 to deliver the ever-increasing speed, capacity, and power efficiency demanded by mobile devices such as smartphones, tablets and handheld gaming consoles. .

Wide I/O 2 provides four times the memory bandwidth (up to 68GBps) of the previous version of the standard, but at lower power consumption (better bandwidth/Watt) with the change to 1.1V supply voltage. From a packaging standpoint, the Wide I/O 2 die is optimized to stack on top of a system on chip (SOC) to minimize power consumption and footprint.

Hung Vuong, Chairman of the JC-42.6 Subcommittee for Low Power Memories, said: “Wide I/O 2 mobile DRAM is an extension of the breakthrough technology pioneered with the publication of Wide I/O in 2012.” Just as switching to multicore processors increased overall computer speed without the need to jump to a new process node, so the vertically stacked architecture allows the Wide I/O 2 interface to deliver four times the bandwidth of LPDDR4 DRAM for around one quarter of the I/O speed.

“With the recent publication of LPDDR4, these two new standards from JEDEC offer designers a range of mobile memory solutions, allowing for maximum flexibility,” Vuong said. “Designers working with a horizontal architecture can choose LPDDR4, while those working with a vertical architecture are supported by Wide I/O 2.”

Mian Quddus, Chairman of the JEDEC Board of Directors, added, “The mobile revolution is driving an unprecedented need for storage solutions that will support the demand for high performance, responsive devices that use less power in a smaller form factor.  JEDEC’s JC-42.6 Subcommittee is dedicated to providing a range of mobile memory solutions to meet industry needs now and in the future.”

Key specifications of the standard include:

  1. Number of channels: 4 and 8;
  2. Number of banks: 32 per die;
  3. Density: 8 Gb to 32 Gb;
  4. Page size: 4 KB (4-channel die), 2 KB (8-channel die);
  5. Max bandwidth per die: 34 GB/s (4-channel die) & 68 GB/s (8-channel die) respectively;
  6. Max I/O speed: 1066 Mbps, 800 Mbps & 1066 Mbps speed bin defined;
  7. Operating Supply Voltage: 1.1 V.

JESD229-2 may be downloaded free of charge from the JEDEC website at

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