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Memory Module Specification
DESCRIPTION:
This document describes ValueRAM's 32M x 72-bit (256MB), CAS Latency 2.5 SDRAM
(Synchronous DRAM) DDR266 ECC memory module. The components on this module
include eighteen 16M x 8-bit (4M x 8-bit x 4 Bank / 133MHz, 7.5ns, CL2.5 components)
SDRAM in TSOP packages. This 184-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.) / 15ns (max.)
Row Cycle Time (tRC) 65ns (min.)
Refresh Row Cycle Time (tRFC) 75ns (min.)
Row Active Time (tRAS) 45ns (min.) / 12,000ns (max.)
Single Power Supply of +2.5V (+/- .25V)
Power 3.825 W (operating)
UL Rating 94 V - 0
Part No. VALUERAM0028-001.A00
10/13/00
Figure 1: KVR266X72C25/256 184-Pin DDR SDRAM Module
KVR266X72C25/256
DDR266 SDRAM 184-Pin ECC
Dual In-Line Memory Module (DIMM)
1.250
0.700
0.393
0.000
0.000
2.886
5.250
0.050
0.0078 ±0.006
(0.20 ±0.15)
(1.270)
0.100
(2.50 )
0.250
(6.350)
0.157
(4.00)
0.071
(1.80)
0.039 ± 0.002
(1.000 ± 0.050)
(3.80)
2.175
(6.62)
0.26
0.1496
(3.00)
0.118
(2.00)
0.0787
(4.00)
0.1575
(31.75)
(17.80)
(10.00)
(00.00)
(73.30)
(133.35)
Units : Inches (Millimeters)
1
(00.00)
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