GS4576C36GL-25I Datasheet, PDF(42/63 Page) GSI Technology – 576Mb CIO Low Latency DRAM (LLDRAM II)

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GS4576C36GL-25I Datasheet, PDF (42/63 Pages) GSI Technology – 576Mb CIO Low Latency DRAM (LLDRAM II)

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GS4576C09/18/36L

Input Slew Rate Derating

The Address and Command Setup and Hold Derating Values shown in the following table should be added to the default tAS/tCS/

tDS and tAH/tCH/tDH specifications when the slew rate of any of these input signals is less than the 2 V/ns.

To determine the setup and hold time needed for a given slew rate, add the tAS/tCS default specification to the âtAS/tCS VREF to

CK/CK Crossingâ and the tAH/tCH default specification to the "tAH/tCH CK/CK Crossing to VREF" derated values in the Address

and Command Setup and Hold Derating Values table. The derated data setup and hold values can be determined the same way

using the âtDS VREF to CK/CK Crossingâ and âtDH to CK/CK Crossing to VREFâ values in the Data Setup and Hold Derating

Values table. The derating values apply to all speed grades.

The setup times in the table relate to a rising signal. The time from the rising signal crossing VIH(AC)MIN to the CK/CK cross point

is static and must be maintained across all slew rates. The derated setup timing describes the point at which the rising signal crosses

VREF(DC) to the CK/CK cross point. This derated value is calculated by determining the time needed to maintain the given slew

rate and the delta between VIH(AC)MIN and the CK/CK cross point. All these same values are also valid for falling signals (with

respect to VIL(AC)MAX and the CK/ CK cross point).

The hold times in the table relate to falling signals. The time from the CK/CK cross point to when the signal crosses VIH(DC) MIN is

static and must be maintained across all slew rates. The derated hold timing describes the delta between the CK/CK cross point to

when the falling signal crosses VREF(DC). This derated value is calculated by determining the time needed to maintain the given

slew rate and the delta between the CK/CK cross point and VIH(DC). The hold values are also valid for rising signals (with respect

to VIL(DC)MAX and the CK and CK cross point).

Note: The above descriptions also pertain to data setup and hold derating when CK/CK are replaced with DK/DK.

Rev: 1.04 11/2013

42/62

Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.

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