EBE51UD8AEFA

Features:

• 240-pin socket type dual in line memory module  (DIMM)  
        -PCB height:  30.0mm  
        -Lead pitch:  1.0mm  
        -Lead-free 
• Power supply:  VDD, VDDQ = 1.8V ± 0.1V 
• Data rate: 533Mbps/400Mbps (max.) 
• SSTL_18 compatible I/O 
• 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  (components) 
• 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 
• Average refresh period  
        -7.8µs at 0  T_C  +85  
        -3.9µs at +85 < T_C  +95  
• 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 


Specifications

Parameter	Symbol	Value	Unit	Note
Voltage on any pin relative to VSS	VT	-0.5 to +2.3	V	1
Supply voltage relative to VSS	VDD	-0.5 to +2.3	V
Short circuit output current	IOS	50	mA	1
Power dissipation	PD	8	W
Operating ambient temperature	TC	0 to +95		1,2
Storage temperature	Tstg	-55 to +100		1

Description

The EBE51UD8AEFA is 64M words  × 64 bits, 1 rank DDR2 SDRAM unbuffered module, mounting 8 pieces of 512M bits 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 EBE51UD8AEFA is realized by the 4 bits 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 EBE51UD8AEFA provides high density mounting  without  utilizing surface mount technology.   Decoupling  capacitors are mounted beside each FBGA (µBGA) on the module board.