512MB, 1GB, 2GB (x72, ECC, SR) 240-Pin DDR2 SDRAM RDIMM
Features
DDR2 SDRAM Registered DIMM (RDIMM)
MT18HTF6472 – 512MB
MT18HTF12872(P) – 1GB
MT18HTF25672(P) – 2GB
For component data sheets, refer to Micron's Web site: www.micron.com
Features
Figure 1:
• 240-pin, registered dual in-line memory module
• Fast data transfer rates: PC2-3200, PC2-4200, PC25300, or PC2-6400
• Supports ECC error detection and correction
• VDD = VDDQ = +1.8V
• VDDSPD = +1.7V to +3.6V
• JEDEC-standard 1.8V I/O (SSTL_18-compatible)
• Differential data strobe (DQS, DQS#) option
• 4n-bit prefetch architecture
• Single rank
• Multiple internal device banks for concurrent
operation
• Programmable CAS# latency (CL)
• Posted CAS# additive latency (AL)
• WRITE latency = READ latency - 1 tCK
• Programmable burst lengths: 4 or 8
• Adjustable data-output drive strength
• 64ms, 8,192-cycle refresh
• On-die termination (ODT)
• Serial presence-detect (SPD) with EEPROM
• Gold edge contacts
240-Pin RDIMM (MO-237
R/C C–Non-Parity, R/C H–Parity)
PCB height: 30mm (1.18in)
Options
Marking
• Parity3
• Operating temperature1
– Commercial (0°C ≤ TA ≤ +70°C)
– Industrial (–40°C ≤ TA ≤ +85°C)
• Package
– 240-pin DIMM (Pb-free)
• Frequency/CAS latency2
– 2.5ns @CL = 5 (DDR2-800)3
– 2.5ns @ CL = 6 (DDR2-800)3
– 3.0ns @ CL = 5 (DDR2-667)3
– 3.75ns @ CL = 4 (DDR2-533)
– 5.0ns @ CL = 3 (DDR2-400)
• PCB height
– 30mm (1.18in)
P
None
I
Y
-80E
-800
-667
-53E
-40E
Notes: 1. Contact Micron for industrial temperature
module offerings.
2. CL = CAS (READ) latency; registered mode
will add one clock cycle to CL.
3. Not available in 512MB density.
Table 1:
Key Timing Parameters
Data Rate (MT/s)
Speed
Grade
Industry
Nomenclature
CL = 6
CL = 5
CL = 4
CL = 3
RCD
(ns)
t
RP
(ns)
t
RC
(ns)
-80E
PC2-6400
–
800
533
–
12.5
12.5
55
-800
PC2-6400
800
667
15
15
55
PC2-5300
PC2-4200
PC2-3200
–
–
–
667
–
–
533
533
533
400
–
-667
-53E
-40E
400
400
400
15
15
15
15
15
15
55
55
55
PDF: 09005aef80e5e752/Source: 09005aef80e5e626
HTF18C64_128_256x72.fm - Rev. E 3/07 EN
1
t
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2003 Micron Technology, Inc. All rights reserved.
Products and specifications discussed herein are subject to change by Micron without notice.
