EBD25UC8AKFA-5

Features:

• 184-pin socket type dual in line memory module (DIMM) 
        -PCB height:  31.75mm 
        -Lead pitch:  1.27mm
• 2.5 V power supply
• Data rate: 400Mbps (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):  3
• Programmable output driver strength: normal/weak 
• Refresh cycles:  (8192 refresh cycles /64ms) 
        -7.8µs maximum average periodic refresh interval
• 2 variations of refresh 
        -Auto refresh 
        -Self refresh 

Specifications

Parameter	Symbol	Value	Unit	Note
Voltage on any pin relative to VSS	VT	-0.5 to +3.6	V
Supply voltage relative to VSS	VDD	-0.5 to +3.6	V
Short circuit output current	IOS	50	mA
Power dissipation	PD	8	W
Operating ambient temperature	TA	0 to +70		1
Storage temperature	Tstg	–55 to +125

Description

The EBD25UC8AKFA is 32M words ×  64  bits,  1  rank Double Data Rate (DDR) SDRAM  unbuffered module, mounting 8 pieces of 256M bits DDR SDRAM sealed in TSOP  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  2  bits prefetch-pipelined  architecture.    Data  strobe  (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  EBD25UC8AKFA provides  high density  mounting  without  utilizing  surface  mount technology.    Decoupling  capacitors  are  mounted beside each TSOP on the module board.