HY5PS1G831LF-C4 HYNIX [Hynix Semiconductor], HY5PS1G831LF-C4 Datasheet - Page 30

• Manufacturer Part Number: HY5PS1G831LF-C4
• Description: 1Gb DDR2 SDRAM
• Manufacturer: HYNIX [Hynix Semiconductor]

Rev. 1.2 / Dec 2006
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
V
the slew rate between the last crossing of V
is always earlier than the nominal slew rate for line between shaded ‘V
slew rate for derating value(see fig a.) If the actual signal is later than the nominal slew rate line anywhere
between shaded ‘V
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 V
the slew rate between the last crossing of V
inal slew rate line between shaded ‘dc to V
Fig.c) If the actual signal is earlier than the nominal slew rate line anywhere between shaded ‘dc to
V
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
V
tion and reach V
For slew rates in between the values listed in table, the derating values may obtained by linear interpola-
tion.
REF
REF
IH/IL
(dc) and the first crossing of V
(dc) region’, the slew rate of a tangent line to the actual signal from the dc level to V
(ac) at the time of the rising clock transition) a valid input signal is still required to complete the transi-
Command /
rate(V/ns)
Address
Slew
IH/IL
REF
(ac).
0.25
0.15
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
(dc) to ac region’, the slew rate of a tangent line to the actual signal from the ac
△ tIS
-1250
+187
+179
+167
+150
+125
-100
-150
-223
-250
-500
-750
+83
-11
-25
-43
-67
+0
2.0 V/ns
IH
△ tIH
-1125
(ac)min. Setup(tIS) nominal slew rate for a falling signal is defined as
-125
-188
-292
-375
-500
-708
+94
+89
+83
+75
+45
+21
-14
-31
-54
-83
REF
0
CK, CK Differential Slew Rate
(dc). Hold(tIH) nominal slew rate for a falling signal is defined as
tIS, tIH Derating Values
REF
REF
REF
△ tIS
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
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TBD
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TBD
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TBD
(dc) region’, use nominal slew rate for derating value(see
(dc) and the first crossing of V
(dc). If the actual signal signal is always later than the nom-
1.5 V/ns
△ tIH
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
△ tIS
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
1.0 V/ns
REF
△ tIH
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
(dc) to ac region’, use nominal
IL
(ac)max. If the actual signal
1HY5PS1G431(L)F
1HY5PS1G831(L)F
Units
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REF
Notes
(dc) level is
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
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