EM47DM0888SBA datasheet(9/39 Pages) EOREX

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EM47DM0888SBA

May. 2011

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AC and DC Logic Input Levels for Differential Signals

Differential signals definition

Differential AC and DC Input Levels

Symbol

Parameter

Min.

Max.

Units

Note

VIHdiff

Differential input high

+0.2

See Note3

VILdiff

Differential input low

See Note3

-0.2

VIHdiff (AC)

AC Differential input high

2x(VIH(AC)-VREF)

See Note3

VILdiff (AC)

AC Differential input low

See Note3

2x(VREF-VIL(AC))

Note1.

It is used to define a differential signal slew-rate.

Note2.

For CK - /CK use VIH/VIL(AC) of address/command and VREFCA; for strobes (DQS, DQS) use VIH/VIL(AC) of

DQs and VREFDQ; if a reduced ac-high or ac-low level is used for a signal group, then the reduced level applies

also here.

Note3.

These values are not defined, however they single-ended signals CK, /CK, DQS, /DQS need to be

within the respective limits (VIH(DC) max, VIL(DC)min) for single-ended signals.

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