1Gb: x4, x8, x16 DDR2 SDRAM
Input Slew Rate Derating
Figure 33: AC Input Test Signal Waveform for Data with DQS (Single-Ended)
VREF
DQS
t
t
t
t
DH
DS
DH
DS
b
b
b
b
Logic levels
VDDQ
VIH(AC)min
VIH(DC)min
VREF(DC)
VIL(DC)max
VIL(AC)max
VSSQ
VREF levels
t
t
t
DS
a
t
DH
a
DS
DH
a
a
Figure 34: AC Input Test Signal Waveform (Differential)
VDDQ
VTR
Crossing point
Vswing
VIX
VCP
VSSQ
PDF: 09005aef821ae8bf
1GbDDR2.pdf – Rev. T 02/10 EN
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