NT5CB128M8GP-EKB datasheet(154/160 Pages) NANYA

154 / 160 page

Version 2.2

154

Nanya Technology Cooperation ©

04/2019

NTC Proprietary

Level: Property

DDR3(L) 1Gb SDRAM

NT5CB(C)128M8GN / NT5CB(C)64M16GP

Data Setup, Hold, and Slew Rate De-rating

For all input signals the total tDS (setup time) and tDH (hold time) required is calculated by adding the data sheet tDS(base)

and tDH(base) value to the delta tDS and delta tDH derating value respectively.

Example: tDS (total setup time) = tDS(base) + delta tDS

Setup (tDS) nominal slew rate for a rising signal is defined as the slew rate between the last crossing of Vref(dc) and the

first crossing of VIH(ac)min. Setup (tDS) nominal slew rate for a falling signal is defined as the slew rate between the last

crossing of Vref(dc) and the first crossing of VIL(ac)max. If the actual signal is always earlier than the nominal slew rate line

between shaded ‘Vref(dc) to ac region’, use nominal slew rate for derating value. If the actual signal is later than the

nominal slew rate line anywhere between shaded ‘Vref(dc) to ac region’, the slew rate of the tangent line to the actual signal

from the ac level to dc level is used for derating value.

Hold (tDH) 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 Vref(dc). Hold (tDH) nominal slew rate for a falling signal is defined as the slew rate between the last

crossing of VIH(dc)min and the first crossing of Vref(dc). If the actual signal is always later than the nominal slew rate line

between shaded ‘dc level to Vref(dc) region’, use nominal slew rate for derating value. If the actual signal is earlier than the

nominal s

lew rate line anywhere between shaded ‘dc to Vref(dc) region’, the slew rate of a tangent line to the actual signal

from the dc level to Vref(dc) level is used for derating value.

For a valid transition the input signal has to remain above/below VIH/IL(ac) for some time tVAC.

Although for slow slew rates the total setup time might be negative (i.e. a valid input signal will not have reached VIH/IL(ac)

at the time of the rising clock transition) a valid input signal is still required to complete the transition and reach VIH/IL(ac).

For slew rates in between the values listed in the following tables, the derating values may be obtained by linear

interpolation. These values are typically not subject to production test. They are verified by design and characterization.

Derating values DDR3L-1066 tDS/tDH - AC/DC based AC160 Threshold

DDR3L AC160 Threshold -> VIH(AC)=VREF(DC)+160mV, VIL(AC)=VREF(DC)-160mV

DQS,

 Differential Slew Rate

4.0 V/ns

3.0 V/ns

2.0 V/ns

1.8 V/ns

1.6 V/ns

1.4 V/ns

1.2 V/ns

1.0 V/ns

△

tDS △tDH △tDS △tDH △tDS △tDH △tDS △tDH △tDS △tDH △tDS △tDH △tDS △tDH △tDS △tDH

Slew rate

V/ns

1.5

0.9

-1

-3

-1

-3

0.8

-3

-8

0.7

-5

0.6

-4

0.5

-6

0.4

-8

-11

NOTE1: Cell contents shaded in gray

are defined as ‘not supported’.

NT5CB128M8GP-EKB Datasheet(PDF) 154 Page - Nanya Technology Corporation.

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