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1. Used to define a differential signal slew-rate.
2. For CK - CK use VIH/VIL (ac) of AADD/CMD and VREFCA; for DQS - DQS, DQSL, DQSL, DQSU, DQSU use VIH/VIL 

(ac) of DQs and VREFDQ; if a reduced ac-high or ac-low levels is used for a signal group, then the reduced level 
applies also here.

3. These values are not defined; however, the single-ended signals Ck, CK, DQS, DQS, DQSL, DQSL, DQSU, DQSU 

need to be within the respective limits (VIH (dc) max, VIL (dc) min) for single-ended signals as well as the limita-
tions for overshoot and undershoot. Refer to "Overshoot and Undershoot Specifications" on page 44.

note : Rising input signal shall become equal to or greater than VIH(ac) level and Falling input signal shall become 
equal to or less than VIL(ac) level.

VIHdiff

Differential input high

+ 0.180

Note 3

V

1

VILdiff

Differential input logic low

Note 3

- 0.180

V

1

VIHdiff (ac)

Differential input high ac

2 x (VIH (ac) - Vref)

Note 3

V

2

VILdiff (ac)

Differential input low ac

Note 3

2 x (VIL (ac) - Vref)

V

2

> 4.0

189

-

201

-

4.0

189

-

201

-

3.0

162

-

179

-

2.0

109

-

134

1.8

91

-

119

-

1.6

69

-

100

-

1.4

40

-

76

-

1.2

note

-

44

-

1.0

note

-

note

-

< 1.0

note

-

note

-