NT5CB128M8GP-EKB datasheet(148/160 Pages) NANYA

148 / 160 page

Version 2.2

148

Nanya Technology Cooperation ©

04/2019

NTC Proprietary

Level: Property

DDR3(L) 1Gb SDRAM

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

Address / Command Setup, Hold, and Derating

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

and tIH(base) value to the delta tIS and delta tIH derating value respectively.

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

Setup (tIS) 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 (tIS) 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 (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 Vref(dc). Hold (tIH) 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 to Vref(dc) region’, use nominal slew rate for derating value. If the actual signal is earlier than the

nominal slew rate line any

where 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).

ADD/CMD Setup and Hold Base-Values for 1V/ns

Grade

Symbol

Reference

800

1066

1333

1600

1866

2133

Unit

Notes

DDR3

tIS(base) AC175

VIH/L(ac)

200

125

tIS(base) AC150

VIH/L(ac)

350

275

190

170

tIS(base) AC135

VIH/L(ac)

tIS(base) AC125

VIH/L(ac)

150

135

tIH(base) DC100

VIH/L(dc)

275

200

140

120

100

DDR3L

tIS(base) AC160

VIH/L(ac)

215

140

tIS(base) AC135

VIH/L(ac)

365

290

205

185

1,2

tIS(base) AC125

VIH/L(ac)

150

1,3

tIH(base) DC90

VIH/L(ac)

285

210

150

130

110

NOTE 1 (AC/DC referenced for 1 V/ns Address/Command slew rate and 2 V/ns differential CK-

 slew rate)

NOTE 2 The tIS(base) AC135 specifications are adjusted from the tIS(base) AC160 specification by adding an additional 125 ps for

DDR3L-800/1066 or 100 ps for DDR3L-1333/1600 of derating to accommodate for the lower alternate threshold of 135 mV and another 25 ps to

account for the earlier reference point [(160 mV - 135 mV) / 1 V/ns].

NOTE 3 The tIS(base) AC125 specifications are adjusted from the tIS(base) AC135 specification by adding an additional 75 ps for DDR3L-1866

of derating to accommodate for the lower alternate threshold of 135 mV and another 10 ps to account for the earlier reference point [(135 mV -

125 mV) / 1 V/ns].

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