2Gb: x4, x8 TwinDie DDR3 SDRAM
Functionality
TwinDieTM DDR3 SDRAM
MT41J512M4 – 32 Meg x 4 x 8 Banks x 2 Ranks
MT41J256M8 – 16 Meg x 8 x 8 Banks x 2 Ranks
For component data sheets, refer to Micron’s Web site: www.micron.com
Functionality
Options
The 2Gb (TwinDie™) DDR3 SDRAM uses Micron’s 1Gb
DDR3 die and has similar functionality. This data sheet
provides ball assignments, a general description, functional block diagrams, electrical specifications, and
package dimensions. Refer to Micron’s 1Gb DDR3
SDRAM data sheet for complete specifications. (Specifications for base part number MT41J256M4 correlate
to TwinDie manufacturing part number MT41J512M4;
specifications for base part number MT41J128M8 correlate to TwinDie manufacturing part number
MT41J256M8.)
• Configuration
– 32 Meg x 4 x 8 banks x 2 ranks
– 16 Meg x 8 x 8 banks x 2 ranks
• FBGA package (lead-free)
– 78-ball FBGA (9mm x 11.5mm)
– 78-ball FBGA (8mm x 11.5mm)
• Timing – cycle time1
– 1.5ns @ CL = 10 (DDR3-1333)
– 1.5ns @ CL = 9 (DDR3-1333)
– 1.87ns @ CL = 8 (DDR3-1066)
– 1.87ns @ CL = 7 (DDR3-1066)
– 2.5ns @ CL = 6 (DDR3-800)
– 2.5ns @ CL = 5 (DDR3-800)
• Self refresh
– Standard
• Operating temperature
– Commercial (0°C ≤ TC ≤ 95°C)
• Revision
Features
• Uses 1Gb Micron die
• Two ranks (includes dual CS#, ODT, CKE, and
ZQ balls)
• Each rank has 8 internal banks
• VDD = VDDQ = +1.5V ±0.075V
• 1.5V center-terminated push/pull I/O
• JEDEC-standard 78-ball ballout
• Low-profile package (1.35mm MAX thickness)
• TC of 0°C to 95°C
– 0°C to 85°C: 8192 refresh cycles in 64ms
– 85°C to 95°C: 8192 refresh cycles in 32ms
Table 1:
Marking
512M4
256M8
THR
THV
-15
-15E
-187
-187E
-25
-25E
None
None
:D/F
Notes: 1. CL = CAS (READ) latency.
Key Timing Parameters
Speed Grade
Data Rate (MT/s)
Target tRCD-tRP-CL
-15
-15E
-187
-187E
-25
-25E
1333
1333
1066
1066
800
800
10-10-10
9-9-9
8-8-8
7-7-7
6-6-6
5-5-5
PDF: 09005aef82fcca5a/Source: 09005aef82ed0bfa
MT41J512M4_32M_16M_twindie.fm - Rev. B 4/09 EN
1
t
RCD (ns)
15
13.5
15
13.1
15
12.5
t
RP (ns)
CL (ns)
15
13.5
15
13.1
15
12.5
15
13.5
15
13.1
15
12.5
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2008 Micron Technology, Inc. All rights reserved.
Products and specifications discussed herein are subject to change by Micron without notice.
