JEDEC SOLID STATE TECHNOLOGY ASSOCIATION
JESD79E
May 2005
JEDEC
STANDARD
Double Data Rate (DDR)
SDRAM Specification
(Revision of JESD79D)
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JEDEC Standard No. 79E
-i-
DOUBLE DATA RATE (DDR) SDRAM SPECIFICATION
(From JEDEC Board Ballot JCB-99-70, and modified by numerous other Board Ballots,
formulated under the cognizance of Committee JC-42.3 on DRAM Parametrics.)
Standard No. 79 Revision Log.
Release 1, June 2000
Release 2, May 2002
Release C, March 2003
Release D, January 2004
Release E, May 2004
Scope
This comprehensive standard defines all required aspects of 64Mb through 1Gb DDR
SDRAMs with X4/X8/X16 data interfaces, including features, functionality, ac and dc
parametrics, packages and pin assignments. This scope will subsequently be expanded
to formally apply to x32 devices, and higher density devices as well.
The purpose of this Standard is to define the minimum set of requirements for JEDEC
compliant 64Mb through 1Gb, X4/X8/X16 DDR SDRAMs. System designs based on the
required aspects of this specification will be supported by all DDR SDRAM vendors
providing JEDEC compliant devices.
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