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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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HYB18T512400B2C Scheda tecnica(PDF) 59 Page - Qimonda AG |
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HYB18T512400B2C Scheda tecnica(HTML) 59 Page - Qimonda AG |
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59 / 69 page  Internet Data Sheet Rev. 1.12, 2007-05 59 10062006-YPTZ-CDR7 HY[B/I]18T512[40/80/16]0B2[C/F](L) 512-Mbit Double-Data-Rate-Two SDRAM TABLE 50 Absolute Jitter Value Definitions Example: for DDR2-667, t CH.ABS.MIN = (0.48 x 3000ps) – 125 ps = 1315 ps = 0.438 x 3000 ps. Table 51 shows clock-jitter specifications. TABLE 51 Clock-Jitter Specifications for –667 and –800 Symbol Parameter Min. Max. Unit t CK.ABS Clock period t CK.AVG(Min) + tJIT.PER(Min) t CK.AVG(Max) + tJIT.PER(Max) ps t CH.ABS Clock high-pulse width t CH.AVG(Min) x tCK.AVG(Min) + tJIT.DUTY(Min) t CH.AVG(Max) x tCK.AVG(Max) + t JIT.DUTY(Max) ps t CL.ABS Clock low-pulse width t CL.AVG(Min) x tCK.AVG(Min) + tJIT.DUTY(Min) t CL.AVG(Max) x tCK.AVG(Max) + t JIT.DUTY(Max) ps Symbol Parameter DDR2 -667 DDR2 -800 Unit Min. Max. Min. Max. t CK.AVG Average clock period nominal w/o jitter 3000 8000 2500 8000 ps t JIT.PER Clock-period jitter –125 +125 –100 +100 ps t JIT(PER,LCK) Clock-period jitter during DLL locking period –100 +100 –80 +80 ps t JIT.CC Cycle-to-cycle clock-period jitter –250 +250 –200 +200 ps t JIT(CC,LCK) Cycle-to-cycle clock-period jitter during DLL- locking period –200 +200 –160 +160 ps t ERR.2PER Cumulative error across 2 cycles –175 +175 –150 +150 ps t ERR.3PER Cumulative error across 3 cycles –225 +225 –175 +175 ps t ERR.4PER Cumulative error across 4 cycles –250 +250 –200 +200 ps t ERR.5PER Cumulative error across 5 cycles –250 +250 –200 +200 ps t ERR(6-10PER) Cumulative error across n cycles with n = 6 .. 10, inclusive –350 +350 –300 +300 ps t ERR(11-50PER) Cumulative error across n cycles with n = 11 .. 50, inclusive –450 +450 –450 +450 ps t CH.AVG Average high-pulse width 0.48 0.52 0.48 0.52 t CK.AVG t CL.AVG Average low-pulse width 0.48 0.52 0.48 0.52 t CK.AVG t JIT.DUTY Duty-cycle jitter –125 +125 –100 +100 ps |
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