# 168 pin DRAM DIMM (Unbuffered)

DIMM=Dual Inline Memory Module

(at the computer)

168 PIN DIMM at the computer.

    Front Side (left side 1-42, right side 43-84)
    Back Side (left side 85-126, right side 127-168)

## Front, Left

Pin | Non-Parity? | Parity? | 72 ECC? | 80 ECC? | Description
--- | --- | --- | --- | --- | ---
1 | VSS | VSS | VSS | VSS | Ground
2 | DQ0 | DQ0 | DQ0 | DQ0 | Data 0
3 | DQ1 | DQ1 | DQ1 | DQ1 | Data 1
4 | DQ2 | DQ2 | DQ2 | DQ2 | Data 2
5 | DQ3 | DQ3 | DQ3 | DQ3 | Data 3
6 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
7 | DQ4 | DQ4 | DQ4 | DQ4 | Data 4
8 | DQ5 | DQ5 | DQ5 | DQ5 | Data 5
9 | DQ6 | DQ6 | DQ6 | DQ6 | Data 6
10 | DQ7 | DQ7 | DQ7 | DQ7 | Data 7
11 | DQ8 | DQ8 | DQ8 | DQ8 | Data 8
12 | VSS | VSS | VSS | VSS | Ground
13 | DQ9 | DQ9 | DQ9 | DQ9 | Data 9
14 | DQ10 | DQ10 | DQ10 | DQ10 | Data 10
15 | DQ11 | DQ11 | DQ11 | DQ11 | Data 11
16 | DQ12 | DQ12 | DQ12 | DQ12 | Data 12
17 | DQ13 | DQ13 | DQ13 | DQ13 | Data 13
18 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
19 | DQ14 | DQ14 | DQ14 | DQ14 | Data 14
20 | DQ15 | DQ15 | DQ15 | DQ15 | Data 15
21 | n/c | CB0 | CB0 | CB0 | Parity/Check Bit Input/Output 0
22 | n/c | CB1 | CB1 | CB1 | Parity/Check Bit Input/Output 1
23 | VSS | VSS | VSS | VSS | Ground
24 | n/c | n/c | n/c | CB8 | Parity/Check Bit Input/Output 8
25 | n/c | n/c | n/c | CB9 | Parity/Check Bit Input/Output 9
26 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
27 | /WE0 | /WE0 | /WE0 | /WE0 | Read/Write Input
28 | /CAS0 | /CAS0 | /CAS0 | /CAS0 | Column Address Strobe 0
29 | /CAS1 | /CAS1 | /CAS1 | /CAS1 | Column Address Strobe 1
30 | /RAS0 | /RAS0 | /RAS0 | /RAS0 | Row Address Strobe 0
31 | /OE0 | /OE0 | /OE0 | /OE0 | Output Enable
32 | VSS | VSS | VSS | VSS | Ground
33 | A0 | A0 | A0 | A0 | Address 0
34 | A2 | A2 | A2 | A2 | Address 2
35 | A4 | A4 | A4 | A4 | Address 4
36 | A6 | A6 | A6 | A6 | Address 6
37 | A8 | A8 | A8 | A8 | Address 8
38 | A10 | A10 | A10 | A10 | Address 10
39 | A12 | A12 | A12 | A12 | Address 12
40 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
41 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
42 | DU | DU | DU | DU | Don't Use

## Front, Right

Pin | Non-Parity? | Parity? | 72 ECC? | 80 ECC? | Description
--- | --- | --- | --- | --- | ---
43 | VSS | VSS | VSS | VSS | Ground
44 | /OE2 | /OE2 | /OE2 | /OE2 |
45 | /RAS2 | /RAS2 | /RAS2 | /RAS2 | Row Address Strobe 2
46 | /CAS2 | /CAS2 | /CAS2 | /CAS2 | Column Address Strobe 2
47 | /CAS3 | /CAS3 | /CAS3 | /CAS3 | Column Address Strobe 3
48 | /WE2 | /WE2 | /WE2 | /WE2 | Read/Write Input
49 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
50 | n/c | n/c | n/c | CB10 | Parity/Check Bit Input/Output 10
51 | n/c | n/c | n/c | CB11 | Parity/Check Bit Input/Output 11
52 | n/c | CB2 | CB2 | CB2 | Parity/Check Bit Input/Output 2
53 | n/c | CB3 | CB3 | CB3 | Parity/Check Bit Input/Output 3
54 | VSS | VSS | VSS | VSS | Ground
55 | DQ16 | DQ16 | DQ16 | DQ16 | Data 16
56 | DQ17 | DQ17 | DQ17 | DQ17 | Data 17
57 | DQ18 | DQ18 | DQ18 | DQ18 | Data 18
58 | DQ19 | DQ19 | DQ19 | DQ19 | Data 19
59 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
60 | DQ20 | DQ20 | DQ20 | DQ20 | Data 20
61 | n/c | n/c | n/c | n/c | Not connected
62 | DU | DU | DU | DU | Don't Use
63 | n/c | n/c | n/c | n/c | Not connected
64 | VSS | VSS | VSS | VSS | Ground
65 | DQ21 | DQ21 | DQ21 | DQ21 | Data 21
66 | DQ22 | DQ22 | DQ22 | DQ22 | Data 22
67 | DQ23 | DQ23 | DQ23 | DQ23 | Data 23
68 | VSS | VSS | VSS | VSS | Ground
69 | DQ24 | DQ24 | DQ24 | DQ24 | Data 24
70 | DQ25 | DQ25 | DQ25 | DQ25 | Data 25
71 | DQ26 | DQ26 | DQ26 | DQ26 | Data 26
72 | DQ27 | DQ27 | DQ27 | DQ27 | Data 27
73 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
74 | DQ28 | DQ28 | DQ28 | DQ28 | Data 28
75 | DQ29 | DQ29 | DQ29 | DQ29 | Data 29
76 | DQ30 | DQ30 | DQ30 | DQ30 | Data 30
77 | DQ31 | DQ31 | DQ31 | DQ31 | Data 31
78 | VSS | VSS | VSS | VSS | Ground
79 | n/c | n/c | n/c | n/c | Not connected
80 | n/c | n/c | n/c | n/c | Not connected
81 | n/c | n/c | n/c | n/c | Not connected
82 | SDA | SDA | SDA | SDA | Serial Data
83 | SCL | SCL | SCL | SCL | Serial Clock
84 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC

## Back, Left

Pin | Non-Parity? | Parity? | 72 ECC? | 80 ECC? | Description
--- | --- | --- | --- | --- | ---
85 | VSS | VSS | VSS | VSS | Ground
86 | DQ32 | DQ32 | DQ32 | DQ32 | Data 32
87 | DQ33 | DQ33 | DQ33 | DQ33 | Data 33
88 | DQ34 | DQ34 | DQ34 | DQ34 | Data 34
89 | DQ35 | DQ35 | DQ35 | DQ35 | Data 35
90 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
91 | DQ36 | DQ36 | DQ36 | DQ36 | Data 36
92 | DQ37 | DQ37 | DQ37 | DQ37 | Data 37
93 | DQ38 | DQ38 | DQ38 | DQ38 | Data 38
94 | DQ39 | DQ39 | DQ39 | DQ39 | Data 39
95 | DQ40 | DQ40 | DQ40 | DQ40 | Data 40
96 | VSS | VSS | VSS | VSS | Ground
97 | DQ41 | DQ41 | DQ41 | DQ41 | Data 41
98 | DQ42 | DQ42 | DQ42 | DQ42 | Data 42
99 | DQ43 | DQ43 | DQ43 | DQ43 | Data 43
100 | DQ44 | DQ44 | DQ44 | DQ44 | Data 44
101 | DQ45 | DQ45 | DQ45 | DQ45 | Data 45
102 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
103 | DQ46 | DQ46 | DQ46 | DQ46 | Data 46
104 | DQ47 | DQ47 | DQ47 | DQ47 | Data 47
105 | n/c | CB4 | CB4 | CB4 | Parity/Check Bit Input/Output 4
106 | n/c | CB5 | CB5 | CB5 | Parity/Check Bit Input/Output 5
107 | VSS | VSS | VSS | VSS | Ground
108 | n/c | n/c | n/c | CB12 | Parity/Check Bit Input/Output 12
109 | n/c | n/c | n/c | CB13 | Parity/Check Bit Input/Output 13
110 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
111 | DU | DU | DU | DU | Don't Use
112 | /CAS4 | /CAS4 | /CAS4 | /CAS4 | Column Address Strobe 4
113 | /CAS5 | /CAS5 | /CAS5 | /CAS5 | Column Address Strobe 5
114 | /RAS1 | /RAS1 | /RAS1 | /RAS1 | Row Address Strobe 1
115 | DU | DU | DU | DU | Don't Use
116 | VSS | VSS | VSS | VSS | Ground
117 | A1 | A1 | A1 | A1 | Address 1
118 | A3 | A3 | A3 | A3 | Address 3
119 | A5 | A5 | A5 | A5 | Address 5
120 | A7 | A7 | A7 | A7 | Address 7
121 | A9 | A9 | A9 | A9 | Address 9
122 | A11 | A11 | A11 | A11 | Address 11
123 | A13 | A13 | A13 | A13 | Address 13
124 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
125 | DU | DU | DU | DU | Don't Use
126 | DU | DU | DU | DU | Don't Use

## Back, Right

Pin | Non-Parity? | Parity? | 72 ECC? | 80 ECC? | Description
--- | --- | --- | --- | --- | ---
127 | VSS | VSS | VSS | VSS | Ground
128 | DU | DU | DU | DU | Don't Use
129 | /RAS3 | /RAS3 | /RAS3 | /RAS3 | Column Address Strobe 3
130 | /CAS6 | /CAS6 | /CAS6 | /CAS6 | Column Address Strobe 6
131 | /CAS7 | /CAS7 | /CAS7 | /CAS7 | Column Address Strobe 7
132 | DU | DU | DU | DU | Don't Use
133 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
134 | n/c | n/c | n/c | CB14 | Parity/Check Bit Input/Output 14
135 | n/c | n/c | n/c | CB15 | Parity/Check Bit Input/Output 15
136 | n/c | CB6 | CB6 | CB6 | Parity/Check Bit Input/Output 6
137 | n/c | CB7 | CB7 | CB7 | Parity/Check Bit Input/Output 7
138 | VSS | VSS | VSS | VSS | Ground
139 | DQ48 | DQ48 | DQ48 | DQ48 | Data 48
140 | DQ49 | DQ49 | DQ49 | DQ49 | Data 49
141 | DQ50 | DQ50 | DQ50 | DQ50 | Data 50
142 | DQ51 | DQ51 | DQ51 | DQ51 | Data 51
143 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
144 | DQ52 | DQ52 | DQ52 | DQ52 | Data 52
145 | n/c | n/c | n/c | n/c | Not connected
146 | DU | DU | DU | DU | Don't Use
147 | n/c | n/c | n/c | n/c | Not connected
148 | VSS | VSS | VSS | VSS | Ground
149 | DQ53 | DQ53 | DQ53 | DQ53 | Data 53
150 | DQ54 | DQ54 | DQ54 | DQ54 | Data 54
151 | DQ55 | DQ55 | DQ55 | DQ55 | Data 55
152 | VSS | VSS | VSS | VSS | Ground
153 | DQ56 | DQ56 | DQ56 | DQ56 | Data 56
154 | DQ57 | DQ57 | DQ57 | DQ57 | Data 57
155 | DQ58 | DQ58 | DQ58 | DQ58 | Data 58
156 | DQ59 | DQ59 | DQ59 | DQ59 | Data 59
157 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC
158 | DQ60 | DQ60 | DQ60 | DQ60 | Data 60
159 | DQ61 | DQ61 | DQ61 | DQ61 | Data 61
160 | DQ62 | DQ62 | DQ62 | DQ62 | Data 62
161 | DQ63 | DQ63 | DQ63 | DQ63 | Data 63
162 | VSS | VSS | VSS | VSS | Ground
163 | CK3 | CK3 | CK3 | CK3 |
164 | n/c | n/c | n/c | n/c | Not connected
165 | SA0 | SA0 | SA0 | SA0 | Serial Address 0
166 | SA1 | SA1 | SA1 | SA1 | Serial Address 1
167 | SA2 | SA2 | SA2 | SA2 | Serial Address 2
168 | VCC | VCC | VCC | VCC | +5 VDC or +3.3 VDC

Contributor: | Joakim Ögren, Mark Brown

Source: | Various productsheets at IBM Memory Products

Copyright © The Hardware Book Team 1996-2004.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-10