1Gb: x4, x8, x16 DDR2 SDRAM
Input Slew Rate Derating
DDR2-667. It is not advised to operate DDR2-800 and DDR2-1066 devices with single-
ended DQS; however, Table 32 would be used with the base values.
Table 32: Single-Ended DQS Slew Rate Derating Values Using tDSb and tDHb
Reference points indicated in bold; Derating values are to be used with base tDSb- and tDHb--specified values
DQS Single-Ended Slew Rate Derated (at VREF
1.6 V/ns 1.4 V/ns 1.2 V/ns 1.0 V/ns 0.8 V/ns
)
2.0 V/ns
1.8 V/ns
0.6 V/ns
0.4 V/ns
DQ (V/ns)
tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH
2.0
1.5
1.0
130 53 130 53 130 53 130 53 130 53 145 48 155 45 165 41 175 38
97
32
97
32
97
32
97
32
97
32 112 27 122 24 132 20 142 17
30 –10 30 –10 30 –10 30 –10 30 –10
25 –24 25 –24 25 –24 25 –24 25 –24
55 –18 65 –22 75 –25
50 –32 60 –36 70 –39
45 –15
0.9
0.8
0.7
0.6
0.5
0.4
40 –29
17 –41 17 –41 17 –41 17 –41 17 –41 32 –46 42 –49 52 –53 61 –56
5
–64
5
–64
5
–64
5
–64
5
–64 20 –69 30 –72 40 –75 50 –79
–93 –98 18 –102 28 –105 38 –108
–147 17 –150
–78 –198 –78 –198 –78 –198 –78 –198 –78 –198 –63 –203 –53 –206 –43 –210 –33 –213
–7
–93
–7
–93
–7
–93
–7
–93
–7
8
–28 –135 –28 –135 –28 –135 –28 –135 –28 –135 –13 –140 –3 –143
7
Table 33: Single-Ended DQS Slew Rate Fully Derated (DQS, DQ at VREF) at DDR2-667
Reference points indicated in bold
DQS Single-Ended Slew Rate Derated (at VREF
1.6 V/ns 1.4 V/ns 1.2 V/ns 1.0 V/ns 0.8 V/ns
DQ (V/ns) tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH tDS tDH
)
2.0 V/ns
1.8 V/ns
0.6 V/ns
0.4 V/ns
2.0
1.5
1.0
330 291 330 291 330 291 330 291 330 291 345 286 355 282 365 29 375 276
330 290 330 290 330 290 330 290 330 290 345 285 355 282 365 279 375 275
330 290 330 290 330 290 330 290 330 290
347 290 347 290 347 290 347 290 347 290
355 282 365 278 375 275
372 282 382 278 392 275
345 285
0.9
0.8
0.7
0.6
0.5
0.4
362 285
367 290 367 290 367 290 367 290 367 290 382 285 392 282 402 278 412 275
391 290 391 290 391 290 391 290 391 290 406 285 416 281 426 278 436 275
426 290 426 290 426 290 426 290 426 290 441 285 451 282 461 278 471 275
472 290 472 290 472 290 472 290 472 290 487 285 497 282 507 278 517 275
522 289 522 289 522 289 522 289 522 289 537 284 547 281 557 278 567 274
PDF: 09005aef821ae8bf
1GbDDR2.pdf – Rev. T 02/10 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
62
© 2004 Micron Technology, Inc. All rights reserved.
MICRON [ MICRON TECHNOLOGY ]
