512MB, 1GB, 2GB (x64, DR) 184-Pin DDR SDRAM UDIMM
Features
DDR SDRAM UDIMM
MT16VDDT6464A – 512MB
MT16VDDT12864A – 1GB
MT16VDDT25664A – 2GB
For component data sheets, refer to Micron’s Web site:
www.micron.com
Features
• 184-pin, unbuffered dual in-line memory module
(UDIMM)
• Fast data transfer rates: PC-2100, PC-2700,
or PC-3200
• 512MB (64 Meg x 64), 1GB (128 Meg x 64),
or 2GB (256 Meg x 64)
• V
DD
= V
DD
Q = +2.5V
(-40B: V
DD
= V
DD
Q = +2.6V)
• V
DDSPD
= +2.3V to +3.6V
• 2.5V I/O (SSTL_2-compatible)
• Internal, pipelined double data rate (DDR)
2n-prefetch architecture
• Bidirectional data strobe (DQS) transmitted/
received with data—that is, source-synchronous
data capture
• Differential clock inputs (CK and CK#)
• Multiple internal device banks for concurrent
operation
• Dual rank
• Selectable burst lengths (BL): 2, 4, or 8
• Auto precharge option
• Auto refresh and self refresh modes: 7.8125µs
maximum average periodic refresh interval
• Serial presence-detect (SPD) with EEPROM
• Selectable CAS latency (CL) for maximum
compatibility
• Gold edge contacts
Figure 1:
184-Pin UDIMM (MO-206 R/C B)
PCB height: 31.75mm (1.25in)
Options
• Operating temperature
1
–
Commercial (0°C
≤
T
A
≤
+70°C)
–
Industrial (–40°C
≤
T
A
≤
+85°C)
• Package
–
200-pin DIMM (standard)
–
200-pin DIMM (Pb-free)
• Memory clock, speed, CAS latency
–
5.0ns (200 MHz), 400 MT/s, CL = 3
–
6.0ns (167 MHz), 333 MT/s, CL = 2.5
–
7.5ns (133 MHz), 266 MT/s, CL = 2
2
–
7.5ns (133 MHz), 266 MT/s, CL = 2
2
–
7.5ns (133 MHz), 266 MT/s, CL = 2.5
2
Marking
None
I
G
Y
-40B
-335
-262
-26A
-265
1. Contact Micron for industrial temperature
module offerings.
2. Not recommended for new designs.
Table 1:
Speed
Grade
-40B
-335
-262
-26A
-265
Key Timing Parameters
Industry
Nomenclature
PC3200
PC2700
PC2100
PC2100
PC2100
Notes:
Data Rate (MT/s)
CL = 3
400
–
–
–
–
CL = 2.5
333
333
266
266
266
CL = 2
266
266
266
266
200
t
RCD
t
RP
t
RC
(ns)
15
18
15
20
20
(ns)
15
18
15
20
20
(ns)
55
60
60
65
65
Notes
1
1. The values of
t
RCD and
t
RP for -335 modules show 18ns to align with industry specifications;
actual DDR SDRAM device specifications are 15ns.
PDF: 09005aef80739fa5/Source:09005aef807397e5
DD16C64_128_256x64A.fm - Rev. E 8/08 EN
1
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology, Inc. All rights reserved.
Products and specifications discussed herein are subject to change by Micron without notice.
512MB, 1GB, 2GB (x64, DR) 184-Pin DDR SDRAM UDIMM
Features
Table 2:
Parameter
Refresh count
Row address
Device bank address
Device configuration
Column address
Module rank address
Addressing
512MB
8K
8K (A0–A12)
4 (BA0, BA1)
256Mb (32 Meg x 8)
1K (A0–A9)
2 (S0#, S1#)
1GB
8K
8K (A0–A12)
4 (BA0, BA1)
512Mb (64 Meg x 8)
2K (A0–A9, A11)
2 (S0#, S1#)
2GB
8K
16K (A0–A13)
4 (BA0, BA1)
1Gb (128 Meg x 8)
2K (A0–A9, A11)
2 (S0#, S1#)
Table 3:
Part Numbers and Timing Parameters – 512MB Modules
Base device: MT46V32M8,
1
256Mb DDR SDRAM
Part Number
2
Module
Density
512MB
512MB
512MB
512MB
512MB
512MB
512MB
512MB
Configuration
64 Meg x 64
64 Meg x 64
64 Meg x 64
64 Meg x 64
64 Meg x 64
64 Meg x 64
64 Meg x 64
64 Meg x 64
Module
Bandwidth
3.2 GB/s
3.2 GB/s
2.7 GB/s
2.7 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
Memory Clock/
Data Rate
5.0ns/400 MT/s
5.0ns/400 MT/s
6.0ns/333 MT/s
6.0ns/333 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
Clock Cycles
(CL-
t
RCD-
t
RP)
3-3-3
3-3-3
2.5-3-3
2.5-3-3
2-2-2
2-3-3
2.5-3-3
2.5-3-3
MT16VDDT6464AG-40B__
MT16VDDT6464AY-40B__
MT16VDDT6464AG-335__
MT16VDDT6464AY-335__
MT16VDDT6464AG-262__
MT16VDDT6464AG-26A__
MT16VDDT6464AG-265__
MT16VDDT6464AY-265__
Table 4:
Part Numbers and Timing Parameters – 1GB Modules
Base device: MT46V64M8,
1
512Mb DDR SDRAM
Part Number
2
MT16VDDT12864AG-40B__
MT16VDDT12864AY-40B__
MT16VDDT12864AG-335__
MT16VDDT12864AY-335__
MT16VDDT12864AG-262__
MT16VDDT12864AG-265__
MT16VDDT12864AY-265__
Notes:
Module
Density
1GB
1GB
1GB
1GB
1GB
1GB
1GB
Configuration
128 Meg x 64
128 Meg x 64
128 Meg x 64
128 Meg x 64
128 Meg x 64
128 Meg x 64
128 Meg x 64
Module
Bandwidth
3.2 GB/s
3.2 GB/s
2.7 GB/s
2.7 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
Memory Clock/
Data Rate
5.0ns/400 MT/s
5.0ns/400 MT/s
6.0ns/333 MT/s
6.0ns/333 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
Clock Cycles
(CL-
t
RCD-
t
RP)
3-3-3
3-3-3
2.5-3-3
2.5-3-3
2-2-2
2.5-3-3
2.5-3-3
1. The data sheets for the base devices can be found on Micron’s Web site.
2. All part numbers end with a two-place code (not shown) that designates component and
PCB revisions. Consult factory for current revision codes.
Example: MT16VDDT6464AY-40BG4.
PDF: 09005aef80739fa5/Source:09005aef807397e5
DD16C64_128_256x64A.fm - Rev. E 8/08 EN
2
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology, Inc. All rights reserved
512MB, 1GB, 2GB (x64, DR) 184-Pin DDR SDRAM UDIMM
Features
Table 5:
Part Numbers and Timing Parameters – 2GB Modules
Base device: MT46V128M8,
1
1Gb DDR SDRAM
Part Number
2
MT16VDDT25664AG-335__
MT16VDDT25664AY-335__
MT16VDDT25664AG-265__
MT16VDDT25664AY-265__
Notes:
Module
Density
2GB
2GB
2GB
2GB
Configuration
256 Meg x 64
256 Meg x 64
256 Meg x 64
256 Meg x 64
Module
Bandwidth
2.7 GB/s
2.7 GB/s
2.71 GB/s
2.71 GB/s
Memory Clock/
Data Rate
6.0ns/333 MT/s
6.0ns/333 MT/s
7.5ns/333 MT/s
7.5ns/333 MT/s
Clock Cycles
(CL-
t
RCD-
t
RP)
2.5-3-3
2.5-3-3
2.5-3-3
2.5-3-3
1. The data sheets for the base devices can be found on Micron’s Web site.
2. All part numbers end with a two-place code (not shown) that designates component and
PCB revisions. Consult factory for current revision codes.
Example: MT16VDDT6464AY-40BG4.
PDF: 09005aef80739fa5/Source:09005aef807397e5
DD16C64_128_256x64A.fm - Rev. E 8/08 EN
3
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology, Inc. All rights reserved
512MB, 1GB, 2GB (x64, DR) 184-Pin DDR SDRAM UDIMM
Pin Assignments and Descriptions
Pin Assignments and Descriptions
Table 6:
Pin Assignments
184-Pin DDR UDIMM Front
Pin Symbol Pin Symbol Pin Symbol Pin Symbol
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
V
REF
DQ0
V
SS
DQ1
DQS0
DQ2
V
DD
DQ3
NC
NC
V
SS
DQ8
DQ9
DQS1
V
DD
Q
CK1
CK1#
V
SS
DQ10
DQ11
CKE0
V
DD
Q
DQ16
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
DQ17
DQS2
V
SS
A9
DQ18
A7
V
DD
Q
DQ19
A5
DQ24
V
SS
DQ25
DQS3
A4
V
DD
DQ26
DQ27
A2
V
SS
A1
NC
NC
V
DD
Notes:
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
NC
A0
NC
V
SS
NC
BA1
DQ32
V
DD
Q
DQ33
DQS4
DQ34
V
SS
BA0
DQ35
DQ40
V
DD
Q
WE#
DQ41
CAS#
V
SS
DQS5
DQ42
DQ43
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
V
DD
NC
DQ48
DQ49
V
SS
CK2#
CK2
V
DD
Q
DQS6
DQ50
DQ51
V
SS
NC
DQ56
DQ57
V
DD
DQS7
DQ58
DQ59
V
SS
NC
SDA
SCL
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
V
SS
DQ4
DQ5
V
DD
Q
DM0
DQ6
DQ7
V
SS
NC
NC
NC
V
DD
Q
DQ12
DQ13
DM1
V
DD
DQ14
DQ15
CKE1
V
DD
Q
NC
DQ20
A12
184-Pin DDR UDIMM Back
Pin Symbol Pin Symbol Pin Symbol
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
V
SS
DQ21
A11
DM2
V
DD
DQ22
A8
DQ23
V
SS
A6
DQ28
DQ29
V
DD
Q
DM3
A3
DQ30
V
SS
DQ31
NC
NC
V
DD
Q
CK0
CK0#
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
V
SS
NC
A10
NC
V
DD
Q
NC
V
SS
DQ36
DQ37
V
DD
DM4
DQ38
DQ39
V
SS
DQ44
RAS#
DQ45
V
DD
Q
S0#
S1#
DM5
V
SS
DQ46
Pin
162
163
164
165
166
167
1
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
Symbol
DQ47
NC
V
DD
Q
DQ52
DQ53
NC/A13
V
DD
DM6
DQ54
DQ55
V
DD
Q
NC
DQ60
DQ61
V
SS
DM7
DQ62
DQ63
V
DD
Q
SA0
SA1
SA2
V
DDSPD
1. Pin 167 is NC for 512MB and 1GB or A13 for 2GB.
PDF: 09005aef80739fa5/Source:09005aef807397e5
DD16C64_128_256x64A.fm - Rev. E 8/08 EN
4
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology, Inc. All rights reserved
512MB, 1GB, 2GB (x64, DR) 184-Pin DDR SDRAM UDIMM
Pin Assignments and Descriptions
Table 7:
Symbol
A0–A13
Pin Descriptions
Type
Input
Description
Address inputs:
Provide the row address for ACTIVE commands, and the column address
and auto precharge bit (A10) for READ/WRITE commands, to select one location out of the
memory array in the respective device bank. A10 sampled during a PRECHARGE command
determines whether the PRECHARGE applies to one device bank (A10 LOW, device bank
selected by BA0 and BA1) or all device banks (A10 HIGH). The address inputs also provide
the op-code during a MODE REGISTER SET command. BA0 and BA1 define which mode
register (mode register or extended mode register) is loaded during the LOAD MODE
REGISTER command. A0–A12 (512MB and1GB) and A0–A13 (2GB).
Bank address:
BA0 and BA1 define the device bank to which an ACTIVE, READ, WRITE, or
PRECHARGE command is being applied.
Clock:
CK and CK# are differential clock inputs. All control, command, and address input
signals are sampled on the crossing of the positive edge of CK and the negative edge of
CK#. Output data (DQ and DQS) is referenced to the crossings of CK and CK#.
Clock enable:
CKE enables (registered HIGH) and CKE disables (registered LOW) the
internal clock, input buffers, and output drivers.
Input data mask:
DM is an input mask signal for write data. Input data is masked when
DM is sampled HIGH, along with that input data, during a write access. DM is sampled on
both edges of DQS. Although the DM pins are input-only, the DM loading is designed to
match that of the DQ and DQS pins.
Command inputs:
RAS#, CAS#, and WE# (along with S#) define the command being
entered.
Chip selects:
S# enables (registered LOW) and disables (registered HIGH) the command
decoder.
Presence-detect address inputs:
These pins are used to configure the SPD EEPROM
address range on the I
2
C bus.
Serial clock for SPD EEPROM:
SCL is used to synchronize the presence-detect data
transfer to and from the module.
Data input/output:
Data bus.
Data strobe:
Output with read data. Edge-aligned with read data. Input with write data.
Center-aligned with write data. Used to capture data.
Serial data:
SDA is a bidirectional pin used to transfer addresses and data into and out of
the presence-detect portion of the module.
Power supply:
+2.5V ±0.2V (-40B: +2.6V ±0.1V).
SPD EEPROM power supply:
+2.3V to +3.6V.
SSTL_2 reference voltage (V
DD
/2).
Ground.
No connect:
These pins are not connected on the module.
BA0, BA1
CK0, CK0#,
CK1, CK1#,
CK2, CK2#
CKE0, CKE1
DM0–DM7
Input
Input
Input
Input
RAS#, CAS#, WE#
S0#, S1#
SA0–SA2
SCL
DQ0–DQ63
DQS0–DQS7
SDA
V
DD
/V
DD
Q
V
DDSPD
V
REF
V
SS
NC
Input
Input
Input
Input
I/O
I/O
I/O
Supply
Supply
Supply
Supply
–
PDF: 09005aef80739fa5/Source:09005aef807397e5
DD16C64_128_256x64A.fm - Rev. E 8/08 EN
5
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology, Inc. All rights reserved
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