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MC-4R256FKE8D-653 Datasheet(PDF) 9 Page - Elpida Memory

No. de pieza MC-4R256FKE8D-653
Descripción Electrónicos  Direct Rambus DRAM RIMM Module 256M-BYTE (128M-WORD x 18-BIT)
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Fabricante Electrónico  ELPIDA [Elpida Memory]
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MC-4R256FKE8D-653 Datasheet(HTML) 9 Page - Elpida Memory

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Data Sheet E0079N20 (Ver 2.0)
9
MC-4R256FKE8D
AC Electrical Specifications
Symbol
Parameter and Conditions
MIN.
TYP.
MAX.
Unit
Z
Module Impedance of RSL signals
25.2
28.0
30.8
Module Impedance of SCK and CMD signals
23.8
28.0
32.2
TPD
Average clock delay from finger to finger of all RSL clock nets
1.56
ns
(CTM, CTMN,CFM, and CFMN)
∆TPD
Propagation delay variation of RSL signals with respect to TPD
Note1,2
−21
+21
ps
∆TPD-CMOS
Propagation delay variation of SCK signal with respect to an average clock
delay
Note1
−250
+250
ps
∆TPD- SCK,CMD Propagation delay variation of CMD signal with respect to SCK signal
−200
+200
ps
Vα/VIN
Attenuation Limit
-845
16.0
%
-745
16.0
-653
12.5
VXF/VIN
Forward crosstalk coefficient
-845
4.0
%
(300ps input rise time 20% - 80%)
-745
4.0
-653
4.0
VXB/VIN
Backward crosstalk coefficient
-845
2.0
%
(300ps input rise time 20% - 80%)
-745
2.0
-653
2.0
RDC
DC Resistance Limit
-845
0.8
-745
0.8
-653
0.8
Notes 1. TPD or Average clock delay is defined as the average delay from finger to finger of all RSL clock nets (CTM,
CTMN, CFM, and CFMN).
2. If the RIMM module meets the following specification, then it is compliant to the specification.
If the RIMM module does not meet these specifications, then the specification can be adjusted by the
“Adjusted
∆TPD Specification” table.
Adjusted
∆∆∆∆TPD Specification
Symbol
Parameter and conditions
Adjusted MIN./MAX.
Absolute
Unit
MIN.
MAX.
∆TPD
Propagation delay variation of RSL signals with respect to TPD
+/
− [17+(18*N*∆Z0)] Note
−30
+30
ps
Note N = Number of RDRAM devices installed on the RIMM module.
∆Z0 = delta Z0% = (MAX. Z0 MIN. Z0) / (MIN. Z0)
(MAX. Z0 and MIN. Z0 are obtained from the loaded (high impedance) impedance coupons of all RSL layers
on the module.)


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