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EDD2504AKTA-E Datasheet(PDF) 8 Page - Elpida Memory

Part No. EDD2504AKTA-E
Description  256M bits DDR SDRAM (64M words x 4 bits)
Download  49 Pages
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Manufacturer  ELPIDA [Elpida Memory]
Direct Link  http://www.elpida.com/en
Logo ELPIDA - Elpida Memory

EDD2504AKTA-E Datasheet(HTML) 8 Page - Elpida Memory

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EDD2504AKTA-E
Data Sheet E0610E10 (Ver. 1.0)
8
13. tDAL = (tWR/tCK)+(tRP/tCK)
For each of the terms above, if not already an integer, round to the next highest integer.
Example: For –7A Speed at CL = 2.5, tCK = 7.5ns, tWR = 15ns and tRP= 20ns,
tDAL = (15ns/7.5ns) + (20ns/7.5ns) = (2) + (3)
tDAL = 5 clocks
Test Conditions
Parameter
Symbol
Value
Unit
Input reference voltage
VREF
VDDQ/2
V
Termination voltage
VTT
VREF
V
Input high voltage
VIH (AC)
VREF
+ 0.31
V
Input low voltage
VIL (AC)
VREF
− 0.31
V
Input differential voltage, CK and /CK
inputs
VID (AC)
0.62
V
Input differential cross point voltage,
CK and /CK inputs
VIX (AC)
VREF
V
Input signal slew rate
SLEW
1
V/ns
VTT
VREF
/CK
CK
VREF
VSS
SLEW = (VIH (AC) – VIL (AC))/
∆t
Measurement point
VIH
VIL
VDD
VDD
VSS
DQ
RT = 50
CL = 30pF
VIX
∆t
tCL
tCK
tCH
VID
Input Waveforms and Output Load


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