White Electronic Designs
32MB – 4Mx64 SDRAM, UNBUFFERED
FEATURES
PC100 and PC133 compatible
Burst Mode Operation
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
Programmable Burst Lengths: 1, 2, 4, 8 or Full
Page
3.3V ± 0.3V Power Supply
144 Pin SO-DIMM JEDEC
• D1: 27.94 (1.10”)
WED3DG644V-D1
DESCRIPTION
The WED3DG644V is a 4Mx64 synchronous DRAM
module which consists of four 4Mx16 SDRAM components
in TSOP II package, and one 2Kb EEPROM in an 8
pin TSOP package for Serial Presence Detect which
are mounted on a 144 pin SO-DIMM multilayer FR4
Substrate.
* This product is subject to change without notice.
NOTE: Consult factory for availability of:
• RoHS compliant products
• Vendor source control options
• Industrial temperature option
PIN CONFIGURATIONS (FRONT SIDE/BACK SIDE)
Pin Front Pin Back Pin Front Pin Back
1
V
SS
2
V
SS
51 DQ14 52 DQ46
3
DQ0
4 DQ32 53 DQ15 54 DQ47
56 V
SSv
5
DQ1
6 DQ33 55
V
SS
7
DQ2
8 DQ34 57
NC
58
NC
9
DQ3 10 DQ35 59
NC
60
NC
12
V
CC
11
V
CC
13 DQ4 14 DQ36
VOLTAGE KEY
15 DQ5 16 DQ37
17 DQ6 18 DQ38 61 CLK0 62 CKE0
19 DQ7 20 DQ39 63
V
CC
64
V
CC
21
V
SS
22
V
SS
65 RAS# 66 CAS#
23 DQM0 24 DQM4 67 WE# 68 *CKE1
25 DQM1 26 DQM5 69 CS0# 70 *A12
27
V
CC
28
V
CC
71 *CS1# 72 *A13
29
A0
30
A3
73 DNU 74 *CK1
31
A1
32
A4
75
V
SS
76
V
SS
33
A2
34
A5
77
NC
78
NC
36
V
SS
79
NC
80
NC
35
V
SS
37 DQ8 38 DQ40 81
V
CC
82
V
CC
39 DQ9 40 DQ41 83 DQ16 84 DQ48
41 DQ10 42 DQ42 85 DQ17 86 DQ49
43 DQ11 44 DQ43 87 DQ18 88 DQ50
46
V
CC
89 DQ19 90 DQ51
45
V
CC
47 DQ12 48 DQ44 91
V
SS
92
V
SS
49 DQ13 50 DQ45 93 DQ20 94 DQ52
Pin
95
97
99
101
103
105
107
109
111
113
115
117
119
121
123
125
127
129
131
133
135
137
139
141
143
Back
DQ21
DQ22
DQ23
V
CC
A6
A8
V
SS
A9
A10/AP
V
CC
DQM2
DQM3
V
SS
DQ24
DQ25
DQ26
DQ27
V
CC
DQ28
DQ29
DQ30
DQ31
V
SS
**SDA
V
CC
Pin Back
96 DQ53
98 DQ54
100 DQ55
102 V
CC
104
A7
106 BA0
108 V
SS
110 BA1
112 A11
114 V
CC
116 DQM6
118 DQM7
120 VSS
122 DQ56
124 DQ57
126 DQ58
128 DQ59
130 V
CC
132 DQ60
134 DQ61
136 DQ62
138 DQ63
140 V
SS
142 **SCL
144 V
CC
A0 – A11
BA0-1
DQ0-63
CLK0
CKE0
CS0#
RAS#
CAS#
WE#
DQM0-7
V
CC
V
SS
*V
REF
SDA
SCL
DNU
NC
PIN NAMES
Address input (Multiplexed)
Select Bank
Data Input/Output
Clock input
Clock Enable input
Chip select Input
Row Address Strobe
Column Address Strobe
Write Enable
DQM
Power Supply (3.3V)
Ground
Power supply for reference
Serial data I/O
Serial clock
Do not use
No Connect
* These pins are not used in this module.
** These pins should be NC in the system
which does not support SPD.
June 2006
Rev. 3
1
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
