DATA SHEET
2GB DDR3 SDRAM SO-DIMM
EBJ21UE8BDS1 (256M words × 64 bits, 2 Ranks)
Specifications
Features
• Density: 2GB
• Double-data-rate architecture; two data transfers per
clock cycle
• Organization
• The high-speed data transfer is realized by the 8 bits
prefetch pipelined architecture
256M words × 64 bits, 2 ranks
• Mounting 16 pieces of 1G bits DDR3 SDRAM sealed
in FBGA
• Bi-directional differential data strobe (DQS and /DQS)
is transmitted/received with data for capturing data at
the receiver
• Package: 204-pin socket type small outline dual in
line memory module (SO-DIMM)
• DQS is edge-aligned with data for READs; center-
aligned with data for WRITEs
PCB height: 30.0mm
Lead pitch: 0.6mm
• Differential clock inputs (CK and /CK)
Lead-free (RoHS compliant) and Halogen-free
• Power supply: VDD = 1.5V ± 0.075V
• Data rate: 1333Mbps/1066Mbps (max.)
• DLL aligns DQ and DQS transitions with CK
transitions
• Commands entered on each positive CK edge; data
and data mask referenced to both edges of DQS
• Eight internal banks for concurrent operation
(components)
• Data mask (DM) for write data
• Interface: SSTL_15
• Posted /CAS by programmable additive latency for
better command and data bus efficiency
• Burst lengths (BL): 8 and 4 with Burst Chop (BC)
• /CAS Latency (CL): 5, 6, 7, 8, 9
• /CAS write latency (CWL): 5, 6, 7
• On-Die-Termination (ODT) for better signal quality
Synchronous ODT
Dynamic ODT
• Precharge: auto precharge option for each burst
access
Asynchronous ODT
• Refresh: auto-refresh, self-refresh
• Refresh cycles
• Multi Purpose Register (MPR) for temperature read
out
• ZQ calibration for DQ drive and ODT
Average refresh period
7.8µs at 0°C ≤ TC ≤ +85°C
3.9µs at +85°C < TC ≤ +95°C
• Programmable Partial Array Self-Refresh (PASR)
• /RESET pin for Power-up sequence and reset
• Operating case temperature range
TC = 0°C to +95°C
function
• SRT range:
Normal/extended
• Programmable Output driver impedance control
Document No. E1623E20 (Ver. 2.0)
Date Published April 2010 (K) Japan
Printed in Japan
URL: http://www.elpida.com
Elpida Memory, Inc. 2010
ELPIDA [ ELPIDA MEMORY ]
