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MC-4R256CEE6B Datasheet(PDF) 9 Page - NEC

Part # MC-4R256CEE6B
Description  Direct Rambus DRAM RIMM Module 256M-BYTE 128M-WORD x 16-BIT
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

MC-4R256CEE6B Datasheet(HTML) 9 Page - NEC

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Preliminary Data Sheet M14541EJ1V1DS00
9
MC-4R256CEE6B, 4R256CEE6C
AC Electrical Specifications
Symbol
Parameter and Conditions
MIN.
TYP.
MAX.
Unit
Z
Module Impedance
25.2
28
30.8
TPD
Average clock delay from finger to finger of all RSL clock nets
-845
2.06
ns
(CTM, CTMN,CFM, and CFMN)
-745
2.06
-653
2.10
∆TPD
Propagation delay variation of RSL signals with respect to TPD
Note1,2
−24
+24
ps
∆TPD-CMOS Propagation delay variation of SCK and CMD signals with respect to
an average clock delay
Note1
−100
+100
ps
Vα/VIN
Attenuation Limit
-845
25
%
-745
25
-653
21
VXF/VIN
Forward crosstalk coefficient
-845
8
%
(300ps input rise time 20% - 80%)
-745
8
-653
8
VXB/VIN
Backward crosstalk coefficient
-845
2.5
%
(300ps input rise time 20% - 80%)
-745
2.5
-653
2.5
RDC
DC Resistance Limit
-845
1.2
-745
1.2
-653
1.2
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
+/
− [24+(18*N*∆Z0)] Note
−50
+50
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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