TwinDie™ 1.2V DDR4 SDRAM
MT40A4G4 – 128 Meg x 4 x 16 Banks x 2 Ranks
MT40A2G8 – 64 Meg x 8 x 16 Banks x 2 Ranks
Description
The 16Gb (TwinDie™) DDR4 SDRAM uses
Micron’s 8Gb DDR4 SDRAM die (essentially two ranks
of the 8Gb DDR4 SDRAM). Refer to Micron’s 8Gb
DDR4 SDRAM data sheet for the specifications not in-
cluded in this document. Specifications for base part
number MT40A2G4 correlate to TwinDie manufactur-
ing part number MT40A4G4; specifications for base
part number MT40A1G8 correlate to TwinDie manu-
facturing part number MT40A2G8.
Features
• Uses 8Gb Micron die
• Two ranks (includes dual CS#, ODT, and CKE balls)
• Each rank has 4 groups of 4 internal banks for con-
current operation
• V
DD
= V
DDQ
= 1.2V (1.14–1.26V)
• 1.2V V
DDQ
-terminated I/O
• JEDEC-standard ball-out
• Low-profile package
• T
C
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
Options Marking
• Configuration
– 128 Meg x 4 x 16 banks x 2 ranks 4G4
– 64 Meg x 8 x 16 banks x 2 ranks 2G8
• FBGA package (Pb-free)
– 78-ball FBGA
(9.5mm x 13mm x 1.2mm) Die Rev :A
FSE
– 78-ball FBGA
(8.0mm x 12mm x 1.2mm) Die Rev :B
NRE
• Timing – cycle time
1
– 0.750ns @ CL = 18 (DDR4-2666) -075E
– 0.833ns @ CL = 16 (DDR4-2400) -083E
– 0.833ns @ CL = 17 (DDR4-2400) -083
– 0.937ns @ CL = 15 (DDR4-2133) -093E
– 0.937ns @ CL = 16 (DDR4-2133) -093
• Self refresh
– Standard None
• Operating temperature
– Commercial (0°C ≤ T
C
≤ 95°C) None
• Revision :A
:B
Note:
1. CL = CAS (READ) latency.
Table 1: Key Timing Parameters
Speed Grade
Data Rate
(MT/s) Target
t
RCD-
t
RP-CL
t
RCD (ns)
t
RP (ns) CL (ns)
-075E
1
2666 18-18-18 13.5 13.5 13.5
-083E
2
2400 16-16-16 13.32 13.32 13.32
-083
2
2400 17-17-17 14.16 14.16 14.16
-093E 2133 15-15-15 14.06 14.06 14.06
-093 2133 16-16-16 15 15 15
Notes:
1. Backward compatible to 1600, CL = 11; 1866, CL = 13; 2133, CL = 15; and 2400, CL = 17.
2. Backward compatible to 2133, CL = 15 (-093E).
16Gb: x4, x8 TwinDie DDR4 SDRAM
Description
PDF: 09005aef85fd40a1
DDR4_16Gb_x4_x8_2CS_TwinDie.pdf - Rev. D 12/16 EN
1
Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2015 Micron Technology, Inc. All rights reserved.
Products and specifications discussed herein are subject to change by Micron without notice.
