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Memory Module Specification
DESCRIPTION:
This document describes ValueRAM's 64M x 72-bit (512MB) DDR400 CL3 SDRAM (Syn-
chronous DRAM) "single rank" Registered ECC memory module. The components on this
module include eighteen 64M x 4-bit (16M x 4-Bit x 4 bank) DDR400 SDRAM in FBGA
packages. This 184-pin DIMM uses gold contact fingers and requires +2.6V. The electrical
and mechanical specifications are as follows:
FEATURES:
Clock Cycle Time (tCK) 5ns (min.) / 10ns (max.)
Row Cycle Time (tRC) 55ns (min.)
Refresh Row Cycle Time (tRFC) 70ns (min.)
Row Active Time (tRAS) 40ns (min.) / 70,000ns (max.)
Single Power Supply of +2.6V (+/- .1V)
Power 5.850 W operating
UL Rating 94 V - 0
Document No. VALUERAM0418-001.A00
05/13/05
Figure 1: KVR400S4R3A/512 184-Pin DIMM
KVR400S4R3A/512
512MB 64M x 72-Bit DDR400 Registered
CL3 ECC 184-Pin DIMM
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 1.200" (30.48mm).
A B
5.25 ± 0.005
5.171
(131.350)
(133.350 ± 0.13)
(30.48)
1.2
5.077
(128.950)
0.393
(10.00)
0.100 Min
(2.50 Min)
(19.80)
0.78
(17.80)
0.7
R (2.00)
0.0787
(3.00)
0.118
(2.30 Min)
A B
0.157 Max
0.050 ± 0.0039
(1.270 ± 0.10)
(3.99 Max)
(4.00)
(0.157)
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