DATA SHEET
2GB Registered DDR2 SDRAM DIMM
EBE21RD4AEFA-6
(256M words
×
72 bits, 2 Ranks)
Description
The EBE21RD4AEFA is a 256M words
×
72 bits, 2
ranks DDR2 SDRAM Module, mounting 36 pieces of
512M bits DDR2 SDRAM sealed in FBGA package.
Read and write operations are performed at the cross
points of the CK and the /CK. This high-speed data
transfer is realized by the 4bits prefetch-pipelined
architecture. Data strobe (DQS and /DQS) both for
read and write are available for high speed and reliable
data bus design. By setting extended mode register,
the on-chip Delay Locked Loop (DLL) can be set
enable or disable. This module provides high density
mounting without utilizing surface mount technology.
Decoupling capacitors are mounted beside each FBGA
on the module board.
Note: Do not push the cover or drop the modules in
order to avoid mechanical defects, which may
result in electrical defects.
Features
•
240-pin socket type dual in line memory module
(DIMM)
PCB height: 30.0mm
Lead pitch: 1.0mm
Lead-free (RoHS compliant)
•
Power supply: VDD
=
1.8V
±
0.1V
•
Data rate: 667Mbps (max.)
•
SSTL_18 compatible I/O
•
Double-data-rate architecture: two data transfers per
clock cycle
•
Bi-directional, data strobe (DQS and /DQS) is
transmitted /received with data, to be used in
capturing data at the receiver
•
DQS is edge aligned with data for READs; center
aligned with data for WRITEs
•
Differential clock inputs (CK and /CK)
•
DLL aligns DQ and DQS transitions with CK
transitions
•
Commands entered on each positive CK edge; data
referenced to both edges of DQS
•
Four internal banks for concurrent operation
(components)
•
Burst length: 4, 8
•
/CAS latency (CL): 3, 4, 5
•
Auto precharge option for each burst access
•
Auto refresh and self refresh modes
•
Average refresh period
7.8µs at 0°C
≤
TC
≤ +85°C
3.9µs at
+85°C <
TC
≤ +95°C
•
Posted CAS by programmable additive latency for
better command and data bus efficiency
•
Off-Chip-Driver Impedance Adjustment and On-Die-
Termination for better signal quality
•
/DQS can be disabled for single-ended Data Strobe
operation
•
1 piece of PLL clock driver, 4 piece of register driver
and 1 piece of serial EEPROM (2k bits EEPROM) for
Presence Detect (PD)
EO
Document No. E0739E11 (Ver. 1.1)
Date Published February 2006 (K) Japan
Printed in Japan
URL: http://www.elpida.com
L
This Product became EOL in November, 2006.
Elpida
Memory, Inc. 2005-2006
od
Pr
uc
t
ELPIDA [ ELPIDA MEMORY ]
