EM47DM1688SBB

Jun. 2012

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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

Differential input high

+0.2

See Note3

V

1

Differential input low

See Note3

-0.2

V

1

AC Differential input high

2x(VIH(AC)-VREF)

See Note3

V

2

AC Differential input low

See Note3

2x(VIL(AC)-VREF)

V

2

Note1.

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

Note2.

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.