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EDE2504AASE Datasheet, PDF (1/66 Pages) Elpida Memory – 256M bits DDR2 SDRAM | |||
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PRELIMINARY DATA SHEET
256M bits DDR2 SDRAM
EDE2504AASE (64M words à 4 bits)
EDE2508AASE (32M words à 8 bits)
EDE2516AASE (16M words à 16 bits)
Description
The EDE2504AA is a 256M bits DDR2 SDRAM
organized as 16,777,216 words à 4 bits à 4 banks.
The EDE2508AA is a 256M bits DDR2 SDRAM
organized as 8,388,608 words à 8 bits à 4 banks.
They are packaged in 64-ball FBGA package.
The EDE2516AA is a 256M bits DDR2 SDRAM
organized as 4,194,304 words à 16 bits à 4 banks.
It is packaged in 84-ball FBGA package.
Features
⢠1.8V power supply
⢠Double-data-rate architecture: two data transfers per
clock cycle
⢠Bi-directional, differential 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
and data mask referenced to both edges of DQS
⢠Four internal banks for concurrent operation
⢠Data mask (DM) for write data
⢠Burst lengths: 4, 8
⢠/CAS Latency (CL): 3, 4, 5
⢠Auto precharge operation for each burst access
⢠Auto refresh and self refresh modes
⢠7.8µs average periodic refresh interval
⢠1.8V (SSTL_18 compatible) I/O
⢠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
⢠Programmable RDQS, /RDQS output for making à 8
organization compatible to à 4 organization
⢠/DQS, (/RDQS) can be disabled for single-ended
Data Strobe operation.
⢠FBGA package is lead free solder (Sn-Ag-Cu)
Document No. E0427E11 (Ver. 1.1)
Date Published February 2006 (K) Japan
URL: http://www.elpida.com
Elpida Memory, Inc. 2003-2006
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