hy5ps1g831alfp Hynix Semiconductor, hy5ps1g831alfp Datasheet - Page 34

• Manufacturer Part Number: hy5ps1g831alfp
• Description: 1gb Ddr2 Sdram
• Manufacturer: Hynix Semiconductor

Rev. 0.7 / Oct. 2007
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 calcu-
late these points when the device 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) 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 V
input signal crossing at the V
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 V
the differential data strobe crosspoint for a falling signal applied to the device under test.
22. Input waveform timing is referenced from the input signal crossing at the V
and V
23. Input waveform timing is referenced from the input signal crossing at the V
and V
tRPST end point
IL
IH
tHZ , tRPST end point = 2*T1-T2
(ac) for a falling signal applied to the device under test.
(dc) for a falling signal applied to the device under test.
tHZ
DQS
DQS
IH
IH
(ac) level to the differential data strobe crosspoint for a rising signal, and from the
(dc) level to the differential data strobe crosspoint for a rising signal and V
IL
(ac) level to the differential data strobe crosspoint for a falling signal applied to
Differential Input waveform timing
VOH + xmV
VOL + 1xmV
VOL + 2xmV
VOH + 2xmV
tDS
tDH
34
tDS
VTT - 2xmV
VTT + 2xmV
tDH
tLZ , tRPRE begin point = 2*T1-T2
VTT + xmV
VTT -xmV
V
V
V
V
V
V
V
IH(ac)
IH(dc)
IL(ac)
DDQ
REF
IL(dc)
HY5PS1G1631A(L)FP
SS
IH
IL
(dc)
HY5PS1G431A(L)FP
HY5PS1G831A(L)FP
max
max
min
min
(dc) level for a rising signal
(ac) level for a rising signal
tHZ
tRPRE begin point
IL
(dc) to