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