PGA257

MOSIS Ceramic Packaging Connections and Information

MOSIS offers as a standard part a 257 pin grid array package. The Kyocera KD-P8710-B or equivalent part has a 0.630" cavity (topside) and is 2.000" square. The pins of this package are arranged on a 20 x 20 pin grid at 0.1" centers. There are four full rows of pins around the outside. The following diagram depicts the bonding pad to pin connectivity as viewed from the top of the package (or the top of the socket into which the package is plugged), with the index at the upper right corner. (This view corresponds to the MOSIS layout that has pin #1 in the upper right hand corner and proceeds counterclockwise around the die.) The columns of the grid are labeled alphabetically and the rows numerically.



			     Y   W   V   U   T   R   P   N   M   L   K   J   H   G   F   E   D   C   B   A
			   +--------------------------------------------------------------------------------+
			   |                                                                                |
			1  | 65 61  57  53  49  45  41  37  35  33  31  29  27  25  21  17  13   9   5   1  | 1
			   |                                                                                |
			2  | 69 63  59  55  51  47  43  39  40  34  32  26  23  19  15  11   7   3  255 253 | 2
			   |                                                                                |
			3  | 73 67  64  60  56  52  50  46  44  38  28  22  20  16  12   8   4  256 251 249 | 3
			   |                                                                                |
			4  | 77 71  68  66  62  58  54  48  42  36  30  24  18  14  10   6   2  252 247 245 | 4
			   |                                                                                |
			5  | 81 75  72  70	         				    254 248 243 241 | 5
			   |                                                                                |
			6  | 85 79  76  74                                                  250 244 239 237 | 6
			   |                                                                                |
			7  | 89 83  80  78                                                  246 242 235 233 | 7
			   |                                                                                |
			8  | 91 87  84  82                                                  240 238 231 229 | 8
			   |                                                                                |
			9  | 93 90  86  88                                                  234 236 232 227 | 9
			   |                                                                                |
			10 | 95 96  92  94                                                  228 230 226 225 | 10
			   |                                                                                |
			11 | 97 98  102 100                                                 222 220 224 223 | 11
			   |                                                                                |
			12 | 99 104 108 106                                                 216 214 218 221 | 12
			   |                                                                                |
			13 |101 103 110 112                                                 210 212 215 219 | 13
			   |                                                                                |
			14 |105 107 114 118                                                 206 208 211 217 | 14
			   |                                                                                |
			15 |109 111 116 122                                                 202 204 207 213 | 15
			   |                                                                                |
			16 |113 115 120 126                                                 198 200 203 209 | 16
			   |                                                                                |
			17 |117 119 124 130 134 138 142 146 152 158 164 170 176 182 186 190 194 196 199 205 | 17
			   |                                                                                |
			18 |121 123 128 132 136 140 144 148 150 156 166 172 174 178 180 184 188 192 195 201 | 18
			   |                                                                                |
			19 |125 127 131 135 139 143 147 151 154 160 162 168 167 171 175 179 183 187 191 197 | 19
			   |                                                                                |
			20 |129 133 137 141 145 149 153 155 157 159 161 163 165 169 173 177 181 185 189 193 | 20
			   +--------------------------------------------------------------------------------+
			    Y   W   V   U   T   R   P   N   M   L   K   J   H   G   F   E   D   C   B   A


			                     Pad to Pin Layout -- TOP View

			


CAUTION: the pad-to-pin layout varies for different 257 pin products, even those from a single vendor. For our purposes, equivalent parts have the same pin grid, the same pad to pin layout, and the same pad to cavity (substrate) connection. Be sure to use this diagram for MOSIS-supplied parts unless or until instructed otherwise.

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