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H5PS1G83JFR Datasheet(PDF) 56 Page - Hynix Semiconductor |
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H5PS1G83JFR Datasheet(HTML) 56 Page - Hynix Semiconductor |
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56 / 62 page  Rev. 1.7 / Apr. 2012 56 Release H5PS1G83JFR Series 10. The maximum limit for this parameter is not a device limit. The device will operate with a greater value for this parameter, but system performance (bus turnaround) will degrade accordingly. 11. tDQSQ: Consists of data pin skew and output pattern effects, and p-channel to n-channel variation of the output drivers as well as output slew rate mismatch between DQS / DQS and associated DQ in any given cycle. 12. The clock frequency is allowed to change during self–refresh mode or precharge power-down mode. In case of clock frequency change during precharge power-down, a specific procedure is required as described in section Input clock frequency change during precharge power down. 13. ODT turn on time min is when the device leaves high impedance and ODT resistance begins to turn on. ODT turn on time max is when the ODT resistance is fully on. Both are measured from tAOND, which is interpreted as 2 clock cycles after the clock edge that registered a first ODT HIGH counting the actual input clock edges. 14. ODT turn off time min is when the device starts to turn off ODT resistance. ODT turn off time max is when the bus is in high impedance. Both are measured from tAOFD, which is interpreted as 0.5 x tCK(avg) [ns] after the second trailing clock edge counting from the clock edge that registered a first ODT LOW and by counting the actual input clock edges. For DDR2-1066, this is 0.9375 [ns] (= 0.5 x 1.875 [ns]) after the second trailing clock edge counting from the clock edge that registered a first ODT LOW and by counting the actual input clock edges. 15. tHZ and tLZ transitions occur in the same access time as valid data transitions. Thesed parameters are referenced to a specific voltage level which specifies when the device output is no longer driving(tHZ), or begins driving (tLZ). Below figure shows a method to calculate the point when device is no longer driving (tHZ), or begins driving (tLZ) by measuring the signal at two different voltages. The actual voltage mea- surement points are not critical as long as the calculation is consistenet. 16. 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. 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 |
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