8

Integrated Silicon Solution, Inc. — www.issi.com

Rev.  00B

06/07/2012

IS43/46DR32801B

Input DC logic level

Symbol 

Parameter

Min.

Max.

Units

Notes

VIH(dc)

dcinputlogicHIGH

VREF+0.125

VDDQ+0.3

V

VIL(dc)

dcinputlogicLOW

-0.3

VREF-0.125

V

Input AC logic level

Symbol Parameter

DDR2-400, DDR2-533

DDR2-667, DDR2-800

Units Notes

Min.

Max.

Min.

Max

VIH(ac) acinputlogicHIGH

VREF+0.250

VDDQ+Vpeak

VREF+0.200

VDDQ+Vpeak

V

1

VIL(ac) acinputlogicLOW

VSSQ-Vpeak

VREF-0.250

VSSQ-Vpeak

VREF-0.200

V

1

AC Input Test Conditions

Symbol

Condition

Value

Units

Notes

VREF

Inputreferencevoltage

0.5xVDDQ

V

1

VSWING(MAX) Inputsignalmaximumpeaktopeakswing

1.0

V

1

SLEW

Inputsignalminimumslewrate

1.0

V/ns

2,3

Notes:

1.RefertoOvershoot/undershootspecificationsforVpeakvalue:maximumpeakamplitudeallowedforovershootandundershoot.

Notes:

1.InputwaveformtimingisreferencedtotheinputsignalcrossingthroughtheVIH/IL(AC)levelappliedtothedeviceundertest.

2.TheinputsignalminimumslewrateistobemaintainedovertherangefromVREFtoVIH(ac)minforrisingedgesandtherangefromVREFto

VIL(ac)maxforfallingedgesasshowninthebelowfigure.

3.ACtimingsarereferencedwithinputwaveformsswitchingfromVIL(ac)toVIH(ac)onthepositivetransitionsandVIH(ac)toVIL(ac)onthe

negativetransitions.

AC input test signal waveform

DTR

DTF

DTF

Falling Slew =

Rising Slew =

DTR