DDR2 SDRAM UDIMM
MT8HTF3264AY – 256MB
MT8HTF6464AY – 512MB
MT8HTF12864AY – 1GB
Features
•
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
•
V
DD
= V
DDQ
= 1.8V
•
V
DDSPD
= 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
t
CK
•
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
Figure 1: 240-Pin UDIMM (MO-237 R/C A and D)
PCB height: 30.0mm (1.18in)
Options Marking
•
Operating temperature
– Commercial (0°C ≤ T
A
≤ +70°C)
None
– Industrial (–40°C ≤ T
A
≤ +85°C)
1
I
•
Package
–
240-pin DIMM (lead-free) Y
•
Frequency/CL
2
–
1.875ns @ CL = 7 (DDR2-1066)
3
-1GA
–
2.5ns @ CL = 5 (DDR2-800) -80E
–
2.5ns @ CL = 6 (DDR2-800) -800
–
3.0ns @ CL = 5 (DDR2-667) -667
–
3.75ns @ CL = 4 (DDR2-533)
4
-53E
–
5.0ns @ CL = 3 (DDR2-400) -40E
Notes:
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
Speed
Grade
Industry
Nomenclature
Data Rate (MT/s) t
RCD
(ns)
t
RP
(ns)
t
RC
(ns)CL = 7 CL = 6 CL = 5 CL = 4 CL = 3
-1GA PC2-8500 1066 800 667 533 400 13.125 13.125 58.125
-80E PC2-6400 800 800 533 400 12.5 12.5 57.5
-800 PC2-6400 800 667 533 400 15 15 60
-667 PC2-5300
–
667 553 400 15 15 60
-53E PC2-4200
– –
553 400 15 15 55
-40E PC2-3200
– –
400 400 15 15 55
256MB, 512MB, 1GB (x64, SR) 240-Pin DDR2 SDRAM UDIMM
Features
PDF: 09005aef80e2ff8d
htf8c32_64_128x64aypdf - Rev. G 3/10 EN
1
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.