1Gb: x4, x8, x16 DDR2 SDRAM
Input Slew Rate Derating
Figure 25: Nominal Slew Rate for tIH
CK
CK#
t
t
t
t
IS
IH
IH
IS
VDDQ
VIH(AC)min
VIH(DC)min
DC to V
REF
region
Nominal
slew rate
VREF(DC)
Nominal
slew rate
DC to V
region
REF
VIL(DC)max
VIL(AC)max
VSS
ΔTF
ΔTR
Figure 26: Tangent Line for tIH
CK
CK#
t
t
t
t
IS
IH
IH
IS
V
DDQ
V
IH(AC)min
Nominal
line
V
IH(DC)min
DC to V
REF
region
Tangent
line
V
REF(DC)
Tangent
line
Nominal
line
DC to V
region
REF
V
IL(DC)max
V
IL(AC)max
V
SS
ΔTR
ΔTF
Tangent line (V
- V
)
Tangent line (V
- V
)
REF[DC]
Hold slew rate
rising signal
Hold slew rate
falling signal
REF[DC]
IL[DC]max
IH[DC]min
=
=
ΔTR
ΔTF
PDF: 09005aef821ae8bf
1GbDDR2.pdf – Rev. T 02/10 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
59
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