240-Pin SDRAM UDIMM Pin Out



240-Pin Memory Module Signal Assignments

Personal Computer DDR2 4200 (Non-ECC), Double Data Rate SDRAM Memory Module description. The 240-pin DIMM have 120 pins per PWB side.
The pinout for the 240-pin SDRAM is provided in the table below. The 240-Pin DDR2 uses 1.8v I/O signalling compatible with SSTL_18.
The PC2-4200 DIMM uses DDR533 DDR2 SDRAM FBGA devices on-board. Common sizes of the DIMM are 256MB, 512MB, and 1GB modules.





240-Pin SDRAM UDIMM PinOut
Pin Num Pin name Pin Num Pin name Pin Num Pin name Pin Num Pin name
1 Vref 61 A4 121 VSS 181 VDDQ
2 Vss 62 VDDQ 122 DQ4 182 A3
3 DQ0 63 A2 123 DQ5 183 A1
4 DQ1 64 VDD 124 VSS 184 VDD
5 Vss 65 VSS 125 DM0 185 CK0
6 DQSO# 66 VSS 126 NC 186 CK0#
7 DQS0 67 VDD 127 VSS 187 VDD
8 Vss 68 NC 128 DQ6 188 A0
9 DQ2 69 VDD 129 DQ7 189 VDD
10 DQ3 70 A10 130 VSS 190 BA1
11 Vss 71 BA0 131 DQ12 191 VDDQ
12 DQ8 72 VDDQ 132 DQ13 192 RAS#
13 DQ9 73 WE# 133 VSS 193 S0#
14 Vss 74 CAS# 134 DM1 194 VDDQ
15 DQS1# 75 VDDQ 135 NC 195 ODT0
16 DQS1 76 NC 136 VSS 196 A13
17 Vss 77 NC 137 CK1 197 VDD
18 NC 78 VDDQ 138 CK1# 198 VSS
19 NC 79 VSS 139 VSS 199 DQ36
20 Vss 80 DQ32 140 DQ14 200 DQ37
21 DQ10 81 DQ33 141 DQ15 201 VSS
22 DQ11 82 VSS 142 VSS 202 DM4
23 Vss 83 DQS4# 143 DQ20 203 NC
24 DQ16 84 DQS4 144 DQ21 204 VSS
25 DQ17 85 VSS 145 VSS 205 DQ38
26 Vss 86 DQ34 146 DM2 206 DQ39
27 DQS2# 87 DQ35 147 NC 207 VSS
28 DQS2 88 VSS 148 VSS 208 DQ44
29 Vss 89 DQ40 149 DQ22 209 DQ45
30 DQ18 90 DQ41 150 DQ23 210 VSS
31 DQ19 91 VSS 151 VSS 211 DM5
32 Vss 92 DQS5# 152 DQ28 212 NC
33 DQ24 93 DQS5 153 DQ29 213 VSS
34 DQ25 94 VSS 154 VSS 214 DQ46
35 Vss 95 DQ42 155 DM3 215 DQ47
36 DQS3# 96 DQ43 156 NC 216 VSS
37 DQS3 97 VSS 157 VSS 217 DQ52
38 Vss 98 DQ48 158 DQ30 218 DQ53
39 Dq26 99 DQ49 159 DQ31 219 VSS
40 Dq27 100 VSS 160 VSS 220 CK2
41 Vss 101 SA2 161 NC 221 CK2#
42 NC 102 NC 162 NC 222 VSS
43 NC 103 VSS 163 VSS 223 DM6
44 Vss 104 DQS6# 164 NC 224 NC
45 NC 105 DQS6 165 NC 225 VSS
46 NC 106 VSS 166 VSS 226 DQ54
47 Vss 107 DQ50 167 NC 227 DQ55
48 NC 108 DQ51 168 NC 228 VSS
49 NC 109 VSS 169 VSS 229 DQ60
50 Vss 110 DQ56 170 VDDQ 230 DQ61
51 VDDQ 111 DQ57 171 NC 231 VSS
52 CKE0 112 VSS 172 VDD 232 DM7
53 VDD 113 DQS7# 173 NC 233 NC
54 BA2 114 DQS7 174 NC 234 VSS
55 NC 115 VSS 175 VDDQ 235 DQ62
56 VDDQ 116 DQ58 176 A12 236 DQ63
57 A11 117 DQ59 177 A9 237 VSS
58 A7 118 VSS 178 VDD 238 VDDSPD
59 VDD 119 SDA 179 A8 239 SA0
60 A5 120 SCL 180 A6 240 SA1




Graphic of the general shape of 240 Pin SDRAM DIMM Memory Module
The approximate board size. 5.250" x 1.181" x 0.07

NC stands for not connected.
Vss stands for the ground pin.
Vdd stands for the main power pin, or power to the internal memory logic.
Vddq stands for the I/O power pin [which supplies power to the output pins only].
DRAM: Dynamic Random Access Memory
SO DIMM: Small Outline Dual Inline Memory Module
SDRAM:: Synchronous DRAM (Random Access Memory), Synchronous to Positive Clock Edge.
UDIMM: Unbuffered Dual Inline Memory Module.

Back to the main Computer Memory Modules information page, or to the main DDR2 memory module page; DDR2 DIMM.
For electronic device manufacturers see one of these pages:
Memory IC manufacturers
Memory Module manufacturers
Memory Module Acronyms
IC Memory Acronyms
DIMM Sockets; DIMM/SIMM Socket Manufacturers.
Additional electronic Equipment manufacturers may be found by selecting the OEM Equipment icon below.
Component manufacturers may be found by selecting the Components icon below.




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Modified 7/16/2015
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