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Memory Module Specification
DESCRIPTION:
This document describes ValueRAM's 32M x 64-bit (256MB) CL2.5 SDRAM (Synchronous
DRAM) DDR266 memory module. The components on this module include eight 16M x 16-bit
(4M x 16-bit x 4 Bank / 133MHz, 7.5ns, CL2.5) DDR266 SDRAM in TSOP packages. This
200-pin DIMM uses gold contact fingers and requires +2.5V. The electrical and mechanical
specifications are as follows:
FEATURES:
Clock Cycle Time (tCK) 7.5ns (min.) / 12ns (max.)
Row Cycle Time (tRC) 65ns (min.)
Refresh Row Cycle Time (tRFC) 75ns (min.)
Row Active Time (tRAS) 45ns (min.) / 120,000ns (max.)
Single Power Supply of +2.5V (+/- .25V)
Operating (IDD0) 2.350 W
UL Rating 94 V - 0
Document No. VALUERAM0231-001.B00
05/06/02
Figure 1: KVR266X64SC25/256 200-Pin DDR SDRAM Module
KVR266X64SC25/256
256MB 32M x 64-Bit DDR266
CL2.5 200-Pin SODIMM
Tolerances : ±.006(.15) unless otherwise specified
2.70
2.50
Units : Inches (Millimeters)
Full R 2x
0.17
(4.20)
0.456
11.40
1.896
(47.40)
0.24
(6.0)
0.086
0.79
(20.00)
2.15
(63.60)
(67.60)
2-f 0.07
(1.80)
1.25
(31.75)
0.16 ± 0.039
(4.00
± 0.10)
0.096
(2.40)
0.07
(1.8)
1
2
0.098
2.45
40 42
39 41
Z Y
199
200
Detail Z
0.16 ± 0.0039
(4.00
± 0.10)
0.04
± 0.0039
(1.00
± 0.1)
0.150 Max
0.04 ± 0.0039
(1.00 ± 0.10)
0.157 Min
(4.00 Min)
(3.80 Max)
0.157 Min
(4.00 Min)
0.024 TYP
0.018
± 0.001
0.01
(0.25)
(0.45 ± 0.03)
(0.60 TYP)
0.102 Min
(2.55 Min)
Detail Y
Note: The module defined in this data sheet is one of several configurations available under this part number. While
all configurations are compatible, the DRAM combination and/or the module height may vary from what is described
here. However, in no configuration will the module height exceed 1.250" (31.75mm).
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