256MB, 512MB, 1GB (x64, SR) 240-Pin DDR2 SDRAM UDIMM
Features
DDR2 SDRAM UDIMM
MT8HTF3264AY – 256MB
MT8HTF6464AY – 512MB
MT8HTF12864AY – 1GB
Figure 1: 240-Pin UDIMM (MO-237 R/C A and D)
Features
PCB height: 30.0mm (1.18in)
240-pin, unbuffered dual in-line memory module
•
•
Fast data transfer rates: PC2-3200, PC2-4200,
PC2-5300, PC2-6400, or PC2-8500
256MB (32 Meg x 64), 512MB (64 Meg x 64),
or 1GB (128 Meg x 64
•
VDD = VDDQ = 1.8V
•
•
•
•
•
•
Options
Marking
VDDSPD = 1.7–3.6V
Operating temperature
– Commercial (0°C ≤ TA ≤ +70°C)
– Industrial (–40°C ≤ TA ≤ +85°C)1
Package
•
JEDEC-standard 1.8V I/O (SSTL_18-compatible)
Differential data strobe (DQS, DQS#) option
4n-bit prefetch architecture
None
I
•
•
Multiple internal device banks for concurrent
operation
240-pin DIMM (lead-free)
Y
–
Frequency/CL2
•
•
•
•
•
•
•
•
•
•
1.875ns @ CL = 7 (DDR2-1066)3
2.5ns @ CL = 5 (DDR2-800)
2.5ns @ CL = 6 (DDR2-800)
3.0ns @ CL = 5 (DDR2-667)
3.75ns @ CL = 4 (DDR2-533)4
5.0ns @ CL = 3 (DDR2-400)
-1GA
-80E
-800
-667
-53E
-40E
Programmable CAS latency (CL)
Posted CAS additive latency (AL)
WRITE latency = READ latency - 1 tCK
Programmable burst lengths (BL): 4 or 8
Adjustable data-output drive strength
64ms, 8192-cycle refresh
–
–
–
–
–
–
1. Contact Micron for industrial temperature
module offerings.
Notes:
On-die termination (ODT)
Serial presence detect (SPD) with EEPROM
Gold edge contacts
2. CL = CAS (READ) latency.
3. Available only in 1GB, Rev. E devices.
4. Not recommended for new designs.
Single rank
Table 1: Key Timing Parameters
Data Rate (MT/s)
Speed
Grade
Industry
Nomenclature
tRCD
(ns)
tRP
(ns)
tRC
(ns)
CL = 7
CL = 6
CL = 5
667
800
667
667
–
CL = 4
CL = 3
400
-1GA
-80E
-800
-667
-53E
-40E
PC2-8500
PC2-6400
PC2-6400
PC2-5300
PC2-4200
PC2-3200
1066
800
800
800
–
533
533
533
553
553
400
13.125
12.5
15
13.125
12.5
15
58.125
57.5
60
400
400
400
15
15
60
400
15
15
55
–
400
15
15
55
–
–
PDF: 09005aef80e2ff8d
htf8c32_64_128x64aypdf - Rev. G 3/10 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
1
© 2003 Micron Technology, Inc. All rights reserved.
Products and specifications discussed herein are subject to change by Micron without notice.