AMS73CAG01808RA
AC and DC Logic Input Levels for Differential Signals
Differential signals definition
tDVAC
VIH.DIFF.AC.MIN
VIH.DIFF.MIN
0.0
half cycle
VIL.DIFF.MAX
VIL.DIFF.AC.MAX
tDVAC
time
Definition of differential ac-swing and "time above ac level" tDVAC
Differential swing requirement for clock (CK - CK) and strobe (DQS - DQS)
Differential AC and DC Input Levels
Symbol
VIHdiff
Parameter
Min.
+0.2
Max.
NOTE 3
Units
Notes
Differential input high
Differential input low
Differential input high AC
Differential input low AC
V
V
V
V
1
1
2
2
VILdiff
NOTE 3
-0.2
VIHdiff(AC)
VILdiff(AC)
2 x (VIH(AC) - VREF)
NOTE 3
NOTE 3
2 x (VREF - VIL(AC))
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 they single-ended signals CK, CK, DQS, DQS need to be within the respec-
tive limits (VIH(DC) max, VIL(DC)min) for single-ended signals as well as the limitations for overshoot and under-
shoot. Refer to "Overshoot and Undershoot specification".
AMS73CAG01808RA Rev. 1.0 December 2010
16
AMS [ Advanced Monolithic Systems Ltd ]
