TS5A21366_1 Datasheet, PDF (62/131 Pages) Texas Instruments – 0.75-Ω DUAL SPST ANALOG SWITCH WITH 1.8-V COMPATIBLE INPUT LOGIC

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 ^tDS_b and ^tDH_b
Reference points indicated in bold; Derating values are to be used with base ^tDS_b- and ^tDH_b--specified values
DQS Single-Ended Slew Rate Derated (at V_REF)
2.0 V/ns 1.8 V/ns 1.6 V/ns 1.4 V/ns 1.2 V/ns 1.0 V/ns 0.8 V/ns 0.6 V/ns
DQ (V/ns) ^tDS ^tDH ^tDS ^tDH ^tDS ^tDH ^tDS ^tDH ^tDS ^tDH ^tDS ^tDH ^tDS ^tDH ^tDS ^tDH
0.4 V/ns
t_DS t_DH
2.0
130 53 130 53 130 53 130 53 130 53 145 48 155 45 165 41 175 38
1.5
97 32 97 32 97 32 97 32 97 32 112 27 122 24 132 20 142 17
1.0
30 –10 30 –10 30 –10 30 –10 30 –10 45 –15 55 –18 65 –22 75 –25
0.9
25 –24 25 –24 25 –24 25 –24 25 –24 40 –29 50 –32 60 –36 70 –39
0.8
17 –41 17 –41 17 –41 17 –41 17 –41 32 –46 42 –49 52 –53 61 –56
0.7
5 –64 5 –64 5 –64 5 –64 5 –64 20 –69 30 –72 40 –75 50 –79
0.6
–7 –93 –7 –93 –7 –93 –7 –93 –7 –93 8 –98 18 –102 28 –105 38 –108
0.5
–28 –135 –28 –135 –28 –135 –28 –135 –28 –135 –13 –140 –3 –143 7 –147 17 –150
0.4
–78 –198 –78 –198 –78 –198 –78 –198 –78 –198 –63 –203 –53 –206 –43 –210 –33 –213
Table 33: Single-Ended DQS Slew Rate Fully Derated (DQS, DQ at V_REF) at DDR2-667
Reference points indicated in bold
DQ (V/ns)
2.0
1.5
2.0 V/ns
t_DS t_DH
330 291
330 290
1.8 V/ns
t_DS t_DH
330 291
330 290
DQS Single-Ended Slew Rate Derated (at V_REF)
1.6 V/ns 1.4 V/ns 1.2 V/ns 1.0 V/ns 0.8 V/ns
t_DS t_DH t_DS t_DH t_DS t_DH t_DS t_DH t_DS t_DH
330 291 330 291 330 291 345 286 355 282
330 290 330 290 330 290 345 285 355 282
0.6 V/ns
t_DS t_DH
365 29
365 279
0.4 V/ns
t_DS t_DH
375 276
375 275
1.0
330 290 330 290 330 290 330 290 330 290 345 285 355 282 365 278 375 275
0.9
347 290 347 290 347 290 347 290 347 290 362 285 372 282 382 278 392 275
0.8
367 290 367 290 367 290 367 290 367 290 382 285 392 282 402 278 412 275
0.7
391 290 391 290 391 290 391 290 391 290 406 285 416 281 426 278 436 275
0.6
426 290 426 290 426 290 426 290 426 290 441 285 451 282 461 278 471 275
0.5
472 290 472 290 472 290 472 290 472 290 487 285 497 282 507 278 517 275
0.4
522 289 522 289 522 289 522 289 522 289 537 284 547 281 557 278 567 274
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1GbDDR2.pdf – Rev. T 02/10 EN
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