2GB (x72, DR) 240-Pin DDR2 SDRAM FBDIMM
Features
1.55V DDR2 SDRAM FBDIMM
MT18RTF25672FDZ 2GB
Information in the 1.8V DDR2 FBDIMM data sheet is
Features
directly applicable to this 1.55V DDR2 FBDIMM, ex-
240-pin, fully buffered DIMM (FBDIMM)
cept where stated otherwise in this data sheet.
Very low-power DDR2 operation
Figure 1: 240-Pin FBDIMM (MO-256 R/C B)
Component configuration: 256 Meg x 8
1.5V V 1.9V for DDR2 SDRAM
DD
Module height: 30.35mm (1.19in)
1.5V V 1.9V for advanced memory buffer
DD
(AMB) DRAM I/O
V = 1.55V
DD
Backward compatible with systems designed for the
standard (1.8V) FBDIMM
Dual rank
Options Marking
Halogen-free
Package
240-pin DIMM (halogen-free) Z
Functionality
1
Frequency/CL
This 1.55V FBDIMM consumes less power than a stand-
3.0ns @ CL = 5 (DDR2-667) -667
ard 1.8V FBDIMM. However, it has the same timing
Note: 1. CL = CAS (READ) latency.
and operating parameters as a standard FBDIMM.
This enables backward compatibility with systems de-
signed for use with standard FBDIMMs.
Table 1: Key Timing Parameters
Data Rate (MT/s) t t t
Speed Industry RCD RP RC
Grade Nomenclature CL = 5 CL = 4 CL = 3 (ns) (ns) (ns)
-667 PC2-5300 667 553 400 15 15 55
-53E PC2-4200 553 400 15 15 55
PDF: 09005aef84281416 Micron Technology, Inc. reserves the right to change products or specifications without notice.
1
rtf18c256x72fdz.pdf - Rev. A 9/10 EN 2010 Micron Technology, Inc. All rights reserved.
Products and specifications discussed herein are subject to change by Micron without notice.2GB (x72, DR) 240-Pin DDR2 SDRAM FBDIMM
Features
Table 2: Addressing
Parameter 2GB
Refresh count 8K
Device bank address 8 BA[2:0]
Device page size per bank 1KB
Device configuration 1Gb (256 Meg x 8)
Row address 16K A[13:0]
Column address 1K A[9:0]
Module rank address 2 S#[1:0]
Table 3: Part Numbers and Timing Parameters 2GB
1
Base device: MT47R128M8, 1Gb DDR2 SDRAM
Module Module Memory Clock/ Clock Cycles Link
2 t t
Part Number Density Configuration Bandwidth Data Rate (CL - RCD - RP) Transfer Rate
MT18RTF25672FDZ-667__ 2GB 256 Meg x 72 PC2-5300 3.0ns/667 MT/s 5-5-5 4.0 GT/s
1. Data sheets for the base devices can be found on Microns Web site.
Notes:
2. All part numbers end with a four-place code (not shown) that designates component, AMB vendor, and PCB
revisions. Consult factory for current revision codes. Example: MT18RTF25672FDZ-667H1D6.
PDF: 09005aef84281416 Micron Technology, Inc. reserves the right to change products or specifications without notice.
2
rtf18c256x72fdz.pdf - Rev. A 9/10 EN 2010 Micron Technology, Inc. All rights reserved.