IS43/46TR16128A, IS43/46TR16128AL,
IS43/46TR82560A, IS43/46TR82560AL
9.6.10 Data Setup, Hold and Slew Rate Derating
9.6.10.1 Nominal slew rate and tVAC for setup time tDS(left) and hold time t DH(right) - DQ with respect to strobe
DQS
DQS
VDDQ
tDS tDH
tDS tDH
tVAC
VIH(ac)MIN
VIH(dc)MIN
Setup slew Rate @
Falling signal
=
[VREF(dc)-VIL(ac)max]
/ ΔTF
VREF(dc)
Nominal
slew rate
Nominal
slew rate
VIL(dc)MAX
VIL(ac)MAX
Setup slew Rate @ Rising
signal
=
[VIH(ac)min-VREF(dc)]
/ ΔTR
tVAC
VSS
TF
TR
VDDQ
tDS tDH
tDS tDH
VIH(ac)MIN
VIH(dc)MIN
Hold slew Rate @
Rising signal
=
[VREF(dc)-VIL(dc)max]
/ ΔTR
VREF(dc)
Nominal
slew rate
Nominal
slew rate
VIL(dc)MAX
VIL(ac)MAX
VSS
tVAC
Hold slew Rate @
Falling signal
=
[VIH(dc)min-VREF(dc)]
/ ΔTF
TR
TF
9.6.10.2 Tangent line for setup time tDS(left) and hold time tDH(right) - DQ with respect to strobe
DQS#
DQS#
DQS
tDS tDH
VDDQ
tDS tDH Nominal
slew rate tVAC
VIH(ac)MIN
VIH(dc)MIN
VREF(dc)
Setup slew Rate @
Falling signal
= tangent line
[VREF(dc)-VIL(ac)max]
/ ΔTF
tangent
line
VIL(dc)MAX
VIL(ac)MAX
Nominal
slew rate
VSS
tVAC
tangent
line
Setup slew Rate @
Rising signal
= tangent line
[VIH(ac)min-VREF(dc)]
/ ΔTR
TR
TF
DQS
VDDQ
VIH(ac)MIN
VIH(dc)MIN
VREF(dc)
VIL(dc)MAX
VIL(ac)MAX
VSS
tDS tDH
Hold slew Rate @
Rising signal
= tangent line
[VREF(dc)-VIL(dc)max]
/ ΔTR
tDS tDH
Nominal
slew rate
tangent
line
tangent
line
TR
Nominal
slew rate
Hold slew Rate @
Falling signal
= tangent line
[VIH(dc)min-VREF(dc)]
/ ΔTF
TF
Integrated Silicon Solution, Inc. – www.issi.com –
81
Rev. G
09/28/2015