1Gb: x4, x8, x16 DDR2 SDRAM
Input Slew Rate Derating
Table 34: Single-Ended DQS Slew Rate Fully Derated (DQS, DQ at VREF) at DDR2-533
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
355 341 355 341 355 341 355 341 355 341 370 336 380 332 390 329 400 326
364 340 364 340 364 340 364 340 364 340 379 335 389 332 399 329 409 325
380 340 380 340 380 340 380 340 380 340
402 340 402 340 402 340 402 340 402 340
405 332 415 328 425 325
427 332 437 328 447 325
395 335
0.9
0.8
0.7
0.6
0.5
0.4
417 335
429 340 429 340 429 340 429 340 429 340 444 335 454 332 464 328 474 325
463 340 463 340 463 340 463 340 463 340 478 335 488 331 498 328 508 325
510 340 510 340 510 340 510 340 510 340 525 335 535 332 545 328 555 325
572 340 572 340 572 340 572 340 572 340 587 335 597 332 607 328 617 325
647 339 647 339 647 339 647 339 647 339 662 334 672 331 682 328 692 324
Table 35: Single-Ended DQS Slew Rate Fully Derated (DQS, DQ at VREF) at DDR2-400
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
405 391 405 391 405 391 405 391 405 391 420 386 430 382 440 379 450 376
414 390 414 390 414 390 414 390 414 390 429 385 439 382 449 379 459 375
430 390 430 390 430 390 430 390 430 390
452 390 452 390 452 390 452 390 452 390
455 382 465 378 475 375
477 382 487 378 497 375
445 385
0.9
0.8
0.7
0.6
0.5
0.4
467 385
479 390 479 390 479 390 479 390 479 390 494 385 504 382 514 378 524 375
513 390 513 390 513 390 513 390 513 390 528 385 538 381 548 378 558 375
560 390 560 390 560 390 560 390 560 390 575 385 585 382 595 378 605 375
622 390 622 390 622 390 622 390 622 390 637 385 647 382 657 378 667 375
697 389 697 389 697 389 697 389 697 389 712 384 722 381 732 378 742 374
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1GbDDR2.pdf – Rev. T 02/10 EN
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