DATA SHEET
512MB Registered DDR2 SDRAM DIMM
EBE51RD8AGFA (64M words
×
72 bits, 1 Rank)
Description
The EBE51RD8AGFA is a 64M words
×
72 bits, 1 rank
DDR2 SDRAM Module, mounting 9 pieces of DDR2
SDRAM sealed in FBGA (µBGA
) 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 (µBGA) on
the module board.
Note: Do not push the components 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/533Mbps/400Mbps (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)
•
Data mask (DM) for write data
•
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, 1 pieces of register driver
and 1 piece of serial EEPROM (2k bits EEPROM) for
Presence Detect (PD)
Document No. E0793E20 (Ver. 2.0)
Date Published October 2005 (K) Japan
Printed in Japan
URL: http://www.elpida.com
Elpida
Memory, Inc. 2005
ELPIDA [ ELPIDA MEMORY ]
