4Gb: x4, x8 TwinDie DDR3 SDRAM
Functionality
TwinDieTM DDR3 SDRAM
MT41J1G4 – 64 Meg x 4 x 8 Banks x 2 Ranks
MT41J512M8 – 32 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 4Gb TwinDie™ DDR3 SDRAM uses Micron’s 2Gb
DDR3 die and has similar functionality. This data sheet
includes key timing parameters, ball assignments, a
functional description, functional block diagrams,
IDD specifications, and package dimensions. Refer to
Micron’s 2Gb DDR3 SDRAM data sheet for complete
specifications. (Specifications for base part number
MT41J512M4 correlate to TwinDie manufacturing part
number MT41J1G4; specifications for base part number MT41J256M8 correlate to TwinDie manufacturing
part number MT41J512M8.)
Features
• Uses 2Gb 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 ball-out
• Low-profile package
• 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
• Configuration
– 64 Meg x 4 x 8 banks x 2 ranks
– 32 Meg x 8 x 8 banks x 2 ranks
• FBGA package (lead-free)
– 82-ball FBGA (12.5 x 15 x 1.35mm)
Rev. A
– 78-ball FBGA (9 x 11.5 x 1.2mm)
Rev. D
• 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 (82-ball FBGA)
• Revision (78-ball FBGA)
1G4
512M8
THU
THD
-15
-15E
-187
-187E
-25
-25E
None
None
:A
:D
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: 09005aef83188bab/Source: 09005aef83169de6
MT41J1G4_64M_32M_twindie.fm - Rev. D 11/09 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.
