Datasheet

AC and DC Logic Input Levels for Differential Signals
Differential signals definition
Differential swing requirement for clock (CK - CK) and strobe (DQS - DQS)
Differential AC and DC Input Levels
NOTE :
1. Used to define a differential signal slew-rate.
2. 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.
3. These values are not defined, however the single-ended signals CK, CK, DQS, DQS need to be within the respective
limits (VIH(DC) max, VIL(DC)min) for single-ended signals as well as the limitations for overshoot and undershoot.
Refer to "Overshoot and Undershoot specification".
Symbol Parameter Min. Max. Units Notes
VIHdiff Differential input high +0.2 NOTE 3 V 1
VILdiff Differential input low NOTE 3 -0.2 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
Definition of differential ac-swing and "time above ac level" tDVAC
0.0
tDVAC
V
IH
.DIFF.MIN
half cycle
SQD-SQD .e.i( egatloV tupnI laitnereffiD
KC-KC , )
time
tDVAC
V
IH
.DIFF.AC.MIN
V
IL
.DIFF.MAX
V
IL
.DIFF.AC.MAX
AS4C256M16D3B-12BIN
AS4C256M16D3B-12BCN
Confidential
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Rev.1.1 April 2017