The document is the official JEDEC DDR4 SDRAM Standard , published in July 2021 . It defines the mandatory features and specifications for DDR4 memory devices, replacing previous versions like JESD79-4C . 1. Core Specification Content
The primary source for the full PDF is the JEDEC JESD79-4D Standards Page. Registration on the JEDEC site is typically required but free for individuals.
: Ball/signal assignments, package pinouts (for x4, x8, and x16 configurations), and ball pitch requirements .
: AC and DC characteristics, including a standard operating voltage of 1.2 V .
Standards aggregators like Accuris (formerly IHS Markit) and GlobalSpec provide the document for purchase or as part of a subscription.
. It provides the technical framework for manufacturers and system designers to ensure device interchangeability and operational reliability. Accuris Standards Store Key Specifications of JESD79-4D
A wide range of industries and organizations use JEDEC79-4D, including: