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H5PS1G83JFR Datasheet(PDF) 37 Page - Hynix Semiconductor |
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H5PS1G83JFR Datasheet(HTML) 37 Page - Hynix Semiconductor |
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37 / 62 page  Rev. 1.7 / Apr. 2012 37 Release H5PS1G83JFR Series 19. tRPST end point and tRPRE begin point are not referenced to a specific voltage level but specify when the device output is no longer driving (tRPST), or begins driving (tRPRE). Below figure shows a method to calculate these points when the device is no longer driving (tRPST), or begins driving (tRPRE). Below Fig- ure shows a method to calculate these points when the device is no longer driving (tRPST), or begins driv- ing (tRPRE) by measuring the signal at two different voltages. The actual voltage measurement points are not critical as long as the calculation is consistent. 20. Input waveform timing with differential data strobe enabled MR[bit10] =0, is referenced from the input signal crossing at the VIH(ac) level to the differential data strobe crosspoint for a rising signal, and from the input signal crossing at the VIL(ac) level to the differential data strobe crosspoint for a falling signal applied to the device under test. 21. Input waveform timing with differential data strobe enabled MR[bit10]=0, is referenced from the input signal crossing at the VIH(dc) level to the differential data strobe crosspoint for a rising signal and VIL(dc) to the differential data strobe crosspoint for a falling signal applied to the device under test. tHZ , tRPST end point = 2*T1-T2 tLZ , tRPRE begin point = 2*T1-T2 VOH + xmV VOH + 2xmV VOL + 1xmV VOL + 2xmV tHZ tRPST end point VTT + 2xmV VTT + xmV VTT -xmV VTT - 2xmV tLZ tRPRE begin point T1 T1 T2 T2 DQS VDDQ VIH(ac)min VIH(dc)min tDH tDS DQS VREF(dc) VSS VIL(dc)max VIL(ac)max tDH tDS Differential Input waveform timing |
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