EBD51RD8ABFA Datasheet, PDF (1/19 Pages) Elpida Memory – 512MB Registered DDR SDRAM DIMM

PRELIMINARY DATA SHEET
512MB Registered DDR SDRAM DIMM
EBD51RD8ABFA (64M words × 72 bits, 1 Rank) _Description
The EBD51RD8ABFA is a 64M words × 72 bits, 1 rank
Double Data Rate (DDR) SDRAM Module, mounting 9
pieces of DDR SDRAM sealed in TSOP package.
Read and write operations are performed at the cross
Epoints of the CK and the /CK. This high-speed data
transfer is realized by the 2-bit prefetch-pipelined
architecture. Data strobe (DQS) both for read and
write are available for high speed and reliable data bus
O^{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 TSOP on the
L _Product ^moduleboard.
Features
• 184-pin socket type dual in line memory module
(DIMM)
 PCB height: 30.48mm
 Lead pitch: 1.27mm
• 2.5V power supply
• Data rate: 333Mbps/266Mbps (max.)
• 2.5 V (SSTL_2 compatible) I/O
• Double Data Rate architecture; two data transfers per
clock cycle
• Bi-directional, data strobe (DQS) is transmitted
/received with data, to be used in capturing data at
the receiver
• Data inputs and outputs are synchronized with DQS
• 4 internal banks for concurrent operation
(Component)
• 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
• Data mask (DM) for write data
• Auto precharge option for each burst access
• Programmable burst length: 2, 4, 8
• Programmable /CAS latency (CL): 2, 2.5
• Refresh cycles: (8192 refresh cycles /64ms)
 7.8µs maximum average periodic refresh interval
• 2 variations of refresh
 Auto refresh
 Self refresh
• 1 piece of PLL clock driver, 2 pieces of register
drivers and 1 piece of serial EEPROM (2k bits
EEPROM) for Presence Detect (PD)
Document No. E0376E10 (Ver. 1.0) _{This product became EOL in March, 2004.}
Date Published April 2003 (K) Japan
URL: http://www.elpida.com
Elpida Memory,Inc. 2003