256MB, 512MB, 1GB, 2GB (x72, ECC, PLL, DR)
184-PIN DDR SDRAM RDIMM
DDR SDRAM
REGISTERED DIMM
Features
• 184-pin, dual in-line memory modules (DIMM)
• Fast data transfer rates: PC1600, PC2100, and
PC2700
• Registered inputs with one-clock delay
• Phase-lock loop (PLL) clock driver to reduce loading
• Utilizes 200 MT/s, 266 MT/s DDR SDRAM
components
• Supports ECC error detection and correction
• 256MB (32 Meg x 72), 512MB (64 Meg x 72), 1GB
(128 Meg x 72), and 2GB (256 Meg x 72)
• V
DD
= V
DD
Q= +2.5V
• V
DDSPD
= +2.3V to +3.6V
• 2.5V I/O (SSTL_2 compatible)
• Commands entered on each positive CK edge
• DQS edge-aligned with data for READs; center-
aligned with data for WRITEs
• Internal, pipelined double data rate (DDR)
architecture; two data accesses per clock cycle
• Bidirectional data strobe (DQS) transmitted/
received with data, i.e., source-synchronous data
capture
• Differential clock inputs (CK and CK#)
• Four internal device banks for concurrent operation
• Programmable burst lengths: 2, 4, or 8
• Auto precharge option
• Auto Refresh and Self Refresh Modes
• 15.6µs (256MB); 7.8125µs (512MB, 1GB, 2GB)
maximum average periodic refresh interval
• Serial Presence-Detect (SPD) with EEPROM
• Programmable READ CAS latency
• Gold edge contacts
For the latest data sheet, please refer to the Micron
Web
site:
www.micron.com/products/modules
MT18VDDT3272D – 256MB
MT18VDDT6472D – 512MB
MT18VDDT12872D – 1GB
MT18VDDT25672D – 2GB
Figure 1: 184-Pin DIMM (MO-206)
Standard PCB 1.7in. (43.18mm)
Low Profile PCB 1.2in. (30.48mm)
OPTIONS
MARKING
• Operating Temperature Range
Commercial
No Mark
Industrial
1
I
• Package
184-pin DIMM (standard)
G
1
184-pin DIMM (lead-free)
Y
2
• Memory Clock, Speed, CAS Latency
7.5ns (133 MHz), 266 MT/s, CL = 2
-262
1
7.5ns (133 MHz), 266 MT/s, CL = 2
-26A
1
7.5ns (133 MHz), 266 MT/s, CL = 2.5
-265
10ns (100 MHz), 200 MT/s, CL = 2
-202
• PCB
Standard 1.7in. (43.18mm)
See page 2 note
1
Low Profile 1.2in. (30.48mm)
See page 2 note
NOTE:
1. Contact Micron for product availability.
2. CL = Device CAS (READ) Latency; registered
mode adds one clock cycle to CL.
Table 1:
Address Table
256MB
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#)
4K
4K (A0–A11)
4 (BA0, BA1)
128Mb (16 Meg x 8)
1K (A0–A9)
2 (S0#, S1#)
Refresh Count
Row Addressing
Device Bank Addressing
Base Device Configuration
Column Addressing
Module Rank Addressing
pdf: 09005aef80e1141d, source: 09005aef80e11353
DD18C32_64_128_256x72DG.fm - Rev. C 9/04 EN
1
©2004 Micron Technology, Inc.
PRODUCTS AND SPECIFICATIONS DISCUSSED HEREIN ARE SUBJECT TO CHANGE BY MICRON WITHOUT NOTICE.
256MB, 512MB, 1GB, 2GB (x72, ECC, PLL, DR)
184-PIN DDR SDRAM RDIMM
Table 2:
Part Numbers and Timing Parameters
1
PART NUMBER
MODULE
DENSITY CONFIGURATION
256MB
256MB
256MB
256MB
256MB
256MB
256MB
256MB
512MB
512MB
512MB
512MB
512MB
512MB
512MB
512MB
1GB
1GB
1GB
1GB
1GB
1GB
1GB
1GB
2GB
2GB
2GB
2GB
2GB
2GB
2GB
2GB
32 Meg x 72
32 Meg x 72
32 Meg x 72
32 Meg x 72
32 Meg x 72
32 Meg x 72
32 Meg x 72
32 Meg x 72
64 Meg x 72
64 Meg x 72
64 Meg x 72
64 Meg x 72
64 Meg x 72
64 Meg x 72
64 Meg x 72
64 Meg x 72
128 Meg x 72
128 Meg x 72
128 Meg x 72
128 Meg x 72
128 Meg x 72
128 Meg x 72
128 Meg x 72
128 Meg x 72
256 Meg x 72
256 Meg x 72
256 Meg x 72
256 Meg x 72
256 Meg x 72
256 Meg x 72
256 Meg x 72
256 Meg x 72
MODULE
BANDWIDTH
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
1.6 GB/s
1.6 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
1.6 GB/s
1.6 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
1.6 GB/s
1.6 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
2.1 GB/s
1.6 GB/s
1.6 GB/s
MEMORYCLOCK/
DATA RATE
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
10ns/200 MT/s
10ns/200 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
10ns/200 MT/s
10ns/200 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
10ns/200 MT/s
10ns/200 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
7.5ns/266 MT/s
10ns/200 MT/s
10ns/200 MT/s
LATENCY
(CL -
t
RCD -
t
RP)
2-2-2
2-2-2
2-3-3
2-3-3
2.5-3-3
2.5-3-3
2-2-2
2-2-2
2-2-2
2-2-2
2-3-3
2-3-3
2.5-3-3
2.5-3-3
2-2-2
2-2-2
2-2-2
2-2-2
2-3-3
2-3-3
2.5-3-3
2.5-3-3
2-2-2
2-2-2
2-2-2
2-2-2
2-3-3
2-3-3
2.5-3-3
2.5-3-3
2-2-2
2-2-2
MT18VDDT3272D(I)G-262__
MT18VDDT3272D(I)Y-262__
MT18VDDT3272D(I)G-26A__
MT18VDDT3272D(I)Y-26A__
MT18VDDT3272D(I)G-265__
MT18VDDT3272D(I)Y-265__
MT18VDDT3272D(I)G-202__
MT18VDDT3272D(I)Y-202__
MT18VDDT6472D(I)G-262__
MT18VDDT6472D(I)Y-262__
MT18VDDT6472D(I)G-26A__
MT18VDDT6472D(I)Y-26A__
MT18VDDT6472D(I)G-265__
MT18VDDT6472D(I)Y-265__
MT18VDDT6472D(I)G-202__
MT18VDDT6472D(I)Y-202__
MT18VDDT12872D(I)G-262__
MT18VDDT12872D(I)Y-262__
MT18VDDT12872D(I)G-26A__
MT18VDDT12872D(I)Y-26A__
MT18VDDT12872D(I)G-265__
MT18VDDT12872D(I)Y-265__
MT18VDDT12872D(I)G-202__
MT18VDDT12872D(I)Y-202__
MT18VDDT25672D(I)G-262__
2
MT18VDDT25672D(I)Y-262__
2
MT18VDDT25672D(I)G-26A__
2
MT18VDDT25672D(I)Y-26A__
2
MT18VDDT25672D(I)G-265__
2
MT18VDDT25672D(I)Y-265__
2
MT18VDDT25672D(I)G-202__
2
MT18VDDT25672D(I)Y-202__
2
NOTE:
1. All part numbers end with a two-place code (not shown), designating component and PCB revisions. Consult factory for
current revision codes. Example: MT18VDDT3272DG-265A1.
2. Contact Micron for product availability.
pdf: 09005aef80e1141d, source: 09005aef80e11353
DD18C32_64_128_256x72DG.fm - Rev. C 9/04 EN
2
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology. Inc.
256MB, 512MB, 1GB, 2GB (x72, ECC, PLL, DR)
184-PIN DDR SDRAM RDIMM
Table 3:
Pin Assignment
(184-Pin DIMM Front)
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
CB0
CB1
V
DD
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
DQS8
A0
CB2
V
SS
CB3
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
DNU
DNU
V
DD
Q
DQS6
DQ50
DQ51
V
SS
NC
DQ56
DQ57
V
DD
DQS7
DQ58
DQ59
V
SS
NC
SDA
SCL
Table 4:
Pin Assignment
(184-Pin DIMM Back)
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
VSS
DQ21
A11
DM2
V
DD
DQ22
A8
DQ23
V
SS
A6
DQ28
DQ29
V
DD
Q
DM3
A3
DQ30
V
SS
DQ31
CB4
CB5
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
VSS
DM8
A10
CB6
V
DD
Q
CB7
V
SS
DQ36
DQ37
V
DD
DM4
DQ38
DQ39
V
SS
DQ44
RAS#
DQ45
V
DD
Q
S0#
S1#
DM5
V
SS
DQ46
162 DQ47
163
NC
164 V
DD
Q
165 DQ52
166 DQ53
167
2
NC/A13
168
V
DD
169 DM6
170 DQ54
171 DQ55
172 V
DD
Q
173
NC
174 DQ60
175 DQ61
176
V
SS
177 DM7
178 DQ62
179 DQ63
180 V
DD
Q
181
SA0
182
SA1
183
SA2
184 V
DDSPD
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
NOTE:
PIN SYMBOL PIN SYMBOL PIN SYMBOL PIN SYMBOL
93
VSS
94
DQ4
95
DQ5
96
V
DD
Q
97
DM0
98
DQ6
99
DQ7
100
V
SS
101
NC
102
NC
103
NC
104 V
DD
Q
105 DQ12
106 DQ13
107 DM1
108
V
DD
109 DQ14
110 DQ15
111 CKE1
112 V
DD
Q
113
NC
114 DQ20
115
1
NC/A12
V
REF
DQ0
V
SS
DQ1
DQS0
DQ2
V
DD
DQ3
NC
RESET#
V
SS
DQ8
DQ9
DQS1
V
DD
Q
DNU
DNU
V
SS
DQ10
DQ11
CKE0
V
DD
Q
DQ16
1. Pin 115 is no connect (NC) for 256MB, or A12 for 512MB, 1GB, and 2GB.
2. Pin 167 is NC for 256MB, 512MB, and 1GB, or A13 for 2GB module.
Figure 2: Pin Locations (184-Pin DIMM)
Front View
Standard 1.7in. (43.18mm)
U10
Low Profile 1.2in. (30.48mm)
Front View
U1
U2
U3
U4
U5
U6
U7
U8
U9
U11
U1
U2
U3
U4
U5
U6
U7
U8
U9
U11
U12
U13
U12
PIN 1
PIN 52
PIN 53
PIN 92
PIN 1
PIN 52
PIN 53
PIN 92
Back View
Back View
U14
U15
U16
U17
U18
U19
U20
U21
U22
U13
U14
U15
U16
U17
U18
U19
U20
U21
U22
U10
PIN 184
PIN 145
PIN 144
PIN 93
PIN 184
PIN 145
PIN 144
PIN 93
Indicates a V
DD
or V
DD
Q pin
Indicates a V
SS
pin
pdf: 09005aef80e1141d, source: 09005aef80e11353
DD18C32_64_128_256x72DG.fm - Rev. C 9/04 EN
3
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology. Inc.
256MB, 512MB, 1GB, 2GB (x72, ECC, PLL, DR)
184-PIN DDR SDRAM RDIMM
Table 5:
Pin Descriptions
SYMBOL
WE#, CAS#,
RAS#
CK0, CK0#
TYPE
Input
DESCRIPTION
Pin numbers may not correlate with symbols; refer to Pin Assignment tables on page 3 for more information
PIN NUMBERS
63, 65, 154
137, 138
21, 111
CKE0–CKE1
157, 158
S0#–S1#
52, 59
27, 29, 32, 37, 41, 43,
48, 115
(A12),
118, 122,
125, 130, 141, 167
(A13)
BA0, BA1
A0–A11
(256MB)
A0–A12
(512MB, 1GB)
A0–A13
(2GB)
10
RESET#
5, 14, 25, 36, 47, 56, 67,
78, 86, 97, 107, 119, 129,
140, 149, 159, 169, 177
44, 45, 49, 51, 134, 135,
142, 144
DQS0–DQS17
CB0–CB7
Command Inputs: RAS#, CAS#, and WE# (along with S#) define
the command being entered.
Input Clock: CK and CK# are differential clock inputs. All address and
control input signals are sampled on the crossing of the positive
edge of CK and negative edge of CK#. Output data (DQs and
DQS) is refer- enced to the crossings of CK and CK#.
Input Clock Enable: CKE HIGH activates and CKE LOW deactivates the
internal clock, input buffers, and output drivers. Taking CKE LOW
provides PRECHARGE POWER-DOWN and SELF REFRESH
operations (all device banks idle), or ACTIVE POWER-DOWN (row
ACTIVE in any device bank). CKE is synchronous for POWER-
DOWN entry and exit, and for SELF REFRESH entry. CKE is
asynchronous for SELF REFRESH exit and for disabling the outputs.
CKE must be maintained HIGH throughout read and write
accesses. Input buffers (excluding CK, CK# and CKE) are disabled
during POWER-DOWN. Input buffers (excluding CKE) are disabled
during SELF REFRESH. CKE is an SSTL_2 input but will detect an
LVCMOS LOW level after V
DD
is applied and until CKE is first
brought HIGH. After CKE is brought HIGH, it becomes an SSTL_2
input only.
Input Chip Select: S# enables (registered LOW) and disables (registered
HIGH) the command decoder. All commands are masked when S#
is registered HIGH. S# is considered part of the command code.
Input Bank Address: BA0 and BA1 define to which device bank an
ACTIVE, READ, WRITE, or PRECHARGE command is being applied.
Input 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, 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.
Input Asynchronously forces all register outputs LOW when RESET# is
LOW. This signal can be used during power-up to ensure CKE is
LOW and SDRAM DQ is High-Z.
Input/ Data Strobe: DQS0–DQS8, Output with READ data, input with
Output WRITE data. DQS is edge-aligned with READ data, centered in
WRITE data. Used to capture data. Data Mask: DQS9–DQS17
function as DM0–DM8 to mask WRITE data when when HIGH.
Input/ Check bits.
Output
pdf: 09005aef80e1141d, source: 09005aef80e11353
DD18C32_64_128_256x72DG.fm - Rev. C 9/04 EN
4
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology. Inc.
256MB, 512MB, 1GB, 2GB (x72, ECC, PLL, DR)
184-PIN DDR SDRAM RDIMM
Table 5:
Pin Descriptions
SYMBOL
DQ0–DQ63
TYPE
Input/ Data I/Os: Data bus.
Output
DESCRIPTION
Pin numbers may not correlate with symbols; refer to Pin Assignment tables on page 3 for more information
PIN NUMBERS
2, 4, 6, 8, 12, 13, 19, 20, 23,
24, 28, 31, 33, 35, 39, 40,
53, 55, 57, 60, 61, 64, 68,
69, 72, 73, 79, 80, 83, 84,
87, 88, 94, 95, 98, 99, 105,
106, 109, 110, 114, 117,
121, 123, 126, 127, 131,
133, 146, 147, 150, 151,
153, 155, 161, 162, 165,
166, 170, 171, 174, 175,
178, 179
92
181, 182, 183
91
SCL
SA0–SA2
SDA
1
15, 22, 30, 54, 62, 77, 96,
104, 112, 128, 136, 143,
156, 164, 172, 180
7, 38, 46, 70, 85, 108, 120,
148, 168
3, 11, 18, 26, 34, 42, 50, 58,
66, 74, 81, 89, 93, 100, 116,
124, 132, 139, 145, 152,
160, 176
184
9, 71, 82, 90, 101, 102, 103,
113, 115 (256MB), 163,
167 (256MB, 512MB, 1GB),
173
16, 17, 75, 76
V
REF
V
DD
Q
Serial Clock for Presence-Detect: SCL is used to synchronize the
presence-detect data transfer to and from the module.
Input Presence-Detect Address Inputs: These pins are used to configure
the presence-detect device.
Input/ Serial Presence-Detect Data: SDA is a bidirectional pin used to
Output transfer addresses and data into and out of the presence-detect
portion of the module.
Supply SSTL_2 reference voltage.
Supply DQ Power Supply: +2.5V ±0.2V.
Input
V
DD
V
SS
Supply Power Supply: +2.5V ±0.2V.
Supply Ground.
V
DDSPD
NC
Supply Serial EEPROM positive power supply: +2.3V to +3.6V.
–
No Connect: These pins should be left unconnected.
DNU
–
Do Not Use: These pins are not connected on this module but are
assigned pins on other modules in this product family.
pdf: 09005aef80e1141d, source: 09005aef80e11353
DD18C32_64_128_256x72DG.fm - Rev. C 9/04 EN
5
Micron Technology, Inc., reserves the right to change products or specifications without notice.
©2004 Micron Technology. Inc.
