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HY5PS12421F-E3 Datasheet(PDF) 31 Page - Hynix Semiconductor |
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HY5PS12421F-E3 Datasheet(HTML) 31 Page - Hynix Semiconductor |
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31 / 35 page  Rev. 1.4 / July 2006 31 1HY5PS12421(L)F HY5PS12821(L)F HY5PS121621(L)F 9. tIS and tIH (input setup and hold) derating 1) For all input signals the total tIS(setup time) and tIH(hold) time) required is calculated by adding the datasheet value to the derating value listed in above Table. Setup(tIS) nominal slew rate for a rising signal is defined as the slew rate between the last crossing of VREF(dc) and the first crossing of VIH(ac)min. Setup(tIS) nominal slew rate for a falling signal is defined as the slew rate between the last crossing of VREF(dc) and the first crossing of VIL(ac)max. If the actual signal is always earlier than the nominal slew rate for line between shaded ‘VREF(dc) to ac region’, use nominal slew rate for derating value(see fig a.) If the actual signal is later than the nominal slew rate line anywhere between shaded ‘VREF(dc) to ac region’, the slew rate of a tangent line to the actual signal from the ac level to dc level is used for derating value(see Fig b.) Hold(tIH) nominal slew rate for a rising signal is defined as the slew rate between the last crossing of VIL(dc)max and the first crossing of VREF(dc). Hold(tIH) nominal slew rate for a falling signal is defined as the slew rate between the last crossing of VREF(dc). If the actual signal is always later than the nominal slew rate line between shaded ‘dc to VREF(dc) region’, use nominal slew rate for derating value(see Fig.c) If the actual signal is earlier than the nominal slew rate line anywhere between shaded ‘dc to VREF(dc) region’, the slew rate of a tangent line to the actual signal from the dc level to VREF(dc) level is used for derating value(see Fig d.) Although for slow rates the total setup time might be negative(i.e. a valid input signal will not have reached VIH/IL(ac) at the time of the rising clock transition) a valid input signal is still required to complete the transition and reach VIH/IL(ac). For slew rates in between the values listed in table, the derating values may obtained by linear interpolation. These values are typically not subject to production test. They are verified by design and characterization. △tIS △tIH △tIS △tIH △tIS △tIH Units Notes 4.0 +187 +94 TBD TBD TBD TBD ps 1 3.5 +179 +89 TBD TBD TBD TBD ps 1 3.0 +167 +83 TBD TBD TBD TBD ps 1 2.5 +150 +75 TBD TBD TBD TBD ps 1 2.0 +125 +45 TBD TBD TBD TBD ps 1 1.5 +83 +21 TBD TBD TBD TBD ps 1 1.0 +0 0 TBDTBD TBDTBD ps 1 0.9 -11 -14 TBD TBD TBD TBD ps 1 0.8 -25 -31 TBD TBD TBD TBD ps 1 0.7 -43 -54 TBD TBD TBD TBD ps 1 0.6 -67 -83 TBD TBD TBD TBD ps 1 0.5 -100 -125 TBD TBD TBD TBD ps 1 0.4 -150 -188 TBD TBD TBD TBD ps 1 0.3 -223 -292 TBD TBD TBD TBD ps 1 0.25 -250 -375 TBD TBD TBD TBD ps 1 0.2 -500 -500 TBD TBD TBD TBD ps 1 0.15 -750 -708 TBD TBD TBD TBD ps 1 0.1 -1250 -1125 TBD TBD TBD TBD ps 1 tIS, tIH Derating Values Command / Address Slew rate(V/ns) 2.0 V/ns CK, CK Differential Slew Rate 1.5 V/ns 1.0 V/ns |
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