W3DG648V-D1
White Electronic Designs
64MB – 2x4Mx64 SDRAM, UNBUFFERED
FEATURES
DESCRIPTION
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Burst Mode Operation
The W3DG648V is a 2x4Mx64 synchronous DRAM module
which consists of eight 4Mx16 SDRAM components in
TSOP II package, and one 2Kb EEPROM in an 8 pin
TSSOP package for Serial Presence Detect which are
mounted on a 144 pin SO-DIMM multilayer FR4 Substrate.
This module is structured as 2 ranks of 8Mx64 SDRAM.
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
Dual Rank
• Vendor source control options
• Industrial temperature option
144 pin SO-DIMM JEDEC
• D1: 27.94mm (1.10")
PIN CONFIGURATIONS (FRONT SIDE/BACK SIDE)
PIN NAMES
PINOUT
A0 – A11
BA0-1
Address Input (Multiplexed)
PIN FRONT PIN
BACK
VSS
PIN FRONT PIN
BACK
DQ45
DQ46
DQ47
VSS
PIN
97
99
BACK
DQ22
DQ23
VCC
A6
A8
PIN
98
BACK
DQ54
DQ55
VCC
A7
BA0
VSS
BA1
A11
VCC
DQMB6
DQMB7
VSS
DQ56
DQ57
DQ58
DQ59
VCC
DQ60
DQ61
DQ62
DQ63
VSS
Select Bank
1
3
5
7
VSS
DQ0
DQ1
DQ2
DQ3
VCC
2
4
6
8
49
51
53
55
57
59
61
63
65
67
69
71
73
75
77
79
81
83
85
87
89
91
93
95
DQ13
DQ14
DQ15
VSS
NC
NC
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
80
82
84
86
88
90
92
94
96
DQ0-63
Data Input/Output
Clock Input
DQ32
DQ33
DQ34
DQ35
VCC
DQ36
DQ37
DQ38
DQ39
VSS
DQMB4
DQMB5
VCC
A3
A4
100
102
104
106
108
110
112
114
116
118
120
122
124
126
128
130
132
134
136
138
140
142
144
CLK0, CLK1
101
103
105
107
109
111
113
115
117
119
121
123
125
127
129
131
133
135
137
139
141
143
CKE0, CKE1 Clock Enable Input
9
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
NC
NC
CS0#, CS1#
RAS#
CAS#
WE#
Chip Select Input
Row Address Strobe
Column Address Strobe
Write Enable
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
VSS
A9
DQ4
DQ5
DQ6
DQ7
VSS
DQMB0
DQMB1
VCC
A0
A1
A2
VSS
DQ8
DQ9
DQ10
DQ11
VCC
CLK0
VCC
CKE0
VCC
CAS#
CKE1
NC
NC
CLK1
VSS
NC
NC
VCC
DQ48
DQ49
DQ50
DQ51
VSS
A10/AP
VCC
DQMB2
DQMB3
VSS
DQ24
DQ25
DQ26
DQ27
VCC
DQ28
DQ29
DQ30
DQ31
VSS
RAS#
WE#
CS0#
CS1#
NC
VSS
NC
NC
VCC
DQ16
DQ17
DQ18
DQ19
VSS
DQMB0-7
VCC
DQMB
Power Supply (3.3V)
Ground
VSS
SDA
Serial Data I/O
Serial Clock
SCL
DNU
Do Not Use
A5
VSS
NC
No Connect
DQ40
DQ41
DQ42
DQ43
VCC
*
These pins are not used in this module.
** These pins should be NC in the system which
does not support SPD.
DQ20
DQ21
DQ52
DQ53
SDA**
VCC
SCL**
VCC
DQ12
DQ44
July 2005
Rev. 6
1
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com