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