EDE2508AEBG Datasheet, PDF (1/77 Pages) Elpida Memory – 256M bits DDR2 SDRAM

DATA SHEET
256M bits DDR2 SDRAM
EDE2508AEBG (32M words × 8 bits)
EDE2516AEBG (16M words × 16 bits)
Specifications
• Density: 256M bits
• Organization
⎯ 8M words × 8 bits × 4 banks (EDE2508AEBG)
⎯ 4M words × 16 bits × 4 banks (EDE2516AEBG)
• Package
⎯ 60-ball FBGA (EDE2508AEBG)
⎯ 84-ball FBGA (EDE2516AEBG)
⎯ Lead-free (RoHS compliant)
• Power supply: VDD, VDDQ = 1.8V ± 0.1V
• Data rate: 800Mbps/667Mbps (max.)
• 1KB page size
⎯ Row address: A0 to A12
⎯ Column address: A0 to A9 (EDE2508AEBG)
A0 to A8 (EDE2516AEBG)
• Four internal banks for concurrent operation
• Interface: SSTL_18
• Burst lengths (BL): 4, 8
• Burst type (BT):
⎯ Sequential (4, 8)
⎯ Interleave (4, 8)
• /CAS Latency (CL): 3, 4, 5, 6
• Precharge: auto precharge option for each burst
access
• Driver strength: normal/weak
• Refresh: auto-refresh, self-refresh
• Refresh cycles: 8192 cycles/64ms
⎯ Average refresh period
7.8μs at 0°C ≤ TC ≤ +85°C
3.9μs at +85°C < TC ≤ +95°C
• Operating case temperature range
⎯ TC = 0°C to +95°C
Features
• Double-data-rate architecture; two data transfers per
clock cycle
• The high-speed data transfer is realized by the 4 bits
prefetch pipelined architecture
• Bi-directional differential data strobe (DQS and /DQS)
is transmitted/received with data for 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
• Data mask (DM) for write data
• 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 × 8
organization compatible to × 4 organization
• /DQS, (/RDQS) can be disabled for single-ended
Data Strobe operation
Document No. E1175E20 (Ver. 2.0)
Date Published January 2008 (K) Japan
Printed in Japan
URL: http://www.elpida.com
©Elpida Memory, Inc. 2007-2008