W3DG72256V-D2
White Electronic Designs
2GB – 256Mx72 SDRAM, REGISTER and SPD, w/PLL
FEATURES
DESCRIPTION
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Burst Mode Operation
The W3DG72256V is a 256Mx72 synchronous DRAM
module which consists of eighteen 256Mx4 stack SDRAM
components in TSOP II package, two 18 bit Drive ICs for
input control signal and one 2Kb EEPROM in an 8 pin
TSSOP package for Serial Presence Detect which are
mounted on a 168 pin DIMM multilayer FR4 Substrate.
Auto and Self Refresh capability
LVTTL compatible inputs and outputs
Serial Presence Detect with EEPROM
Fully synchronous: All signals are registered on the
positive edge of the system clock
* This product is subject to change without notice.
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Programmable Burst Lengths: 1, 2, 4, 8 or Full
Page
NOTE: Consult factory for availability of:
• RoHS compliant products
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3.3V 0.3V Power Supply
168 Pin DIMM JEDEC
• Vendor source control options
• Industrial temperature option
• PCB - D2: 37.34mm (1.47”)
PIN CONFIGURATIONS (FRONT SIDE/BACK SIDE)
PIN NAMES
A0 – A12
BA0-1
DQ0-63
CB0-7
CK0
Address Input (Multiplexed)
Select Bank
PIN FRONT PIN
BACK
DQM1
CS0#
DNU
VSS
PIN FRONT PIN
BACK
PIN
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
BACK
DQM5
CS1#
RAS#
VSS
PIN
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
BACK
DQ50
DQ51
VCC
DQ52
NC
*VREF
REGE
VSS
DQ53
DQ54
DQ55
VSS
DQ56
DQ57
DQ58
DQ59
VCC
DQ60
DQ61
DQ62
DQ63
VSS
*CK3
NC
**SA0
**SA1
**SA2
VCC
1
2
3
4
5
6
7
8
VSS
DQ0
DQ1
DQ2
DQ3
VCC
DQ4
DQ5
DQ6
DQ7
DQ8
VSS
DQ9
DQ10
DQ11
DQ12
DQ13
VCC
DQ14
DQ15
CB0
CB1
VSS
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
DQ18
DQ19
VCC
DQ20
NC
*VREF
*CKE1
VSS
DQ21
DQ22
DQ23
VSS
DQ24
DQ25
DQ26
DQ27
VCC
DQ28
DQ29
DQ30
DQ31
VSS
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
VSS
DQ32
DQ33
DQ34
DQ35
VCC
DQ36
DQ37
DQ38
DQ39
DQ40
VSS
DQ41
DQ42
DQ43
DQ44
DQ45
VCC
DQ46
DQ47
CB4
Data Input/Output
Check Bit (Data-In/Data-Out)
Clock Input
A0
A2
A4
A6
A1
A3
A5
A7
A9
BA0
A11
VCC
*CK1
A12
CKE0
Clock Enable Input
CS0#, CS3# Chip Select Input
RAS#
CAS#
WE#
DQM0-7
VCC
Row Address Strobe
Column Address Strobe
Write Enable
DQM
Power Supply (3.3V)
Ground
Power Supply for Reference
Register Enable
Serial Data I/O
Serial Clock
Address in EEPROM
Do Not Use
9
A8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
A10/AP
BA1
VCC
VCC
CK0
VSS
DNU
CS2#
DQM2
DQM3
DNU
VCC
VSS
*VREF
REGE
SDA
VSS
CKE0
CS3#
DQM6
DQM7
*A13
VCC
SCL
SA0-2
DNU
NC
No Connect
NC
NC
CB5
VSS
NC
NC
VCC
CAS#
DQM4
NC
NC
*
These pins are not used in this module.
*CK2
NC
NC
**SDA
**SCL
VCC
** These pins should be NC in the system which does
NC
NC
VCC
WE#
DQM0
CB2
CB3
VSS
DQ16
DQ17
CB6
CB7
VSS
DQ48
DQ49
not support SPD.
August 2005
Rev. 3
1
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com