Datasheet

6
Differential AC and DC Input Levels
Parameter
Symbol
DDR4-1600/1866/2133
Unit
Note
Min
Max
differential input high DC
VIHdiff(DC)
+0.150
NOTE 3
V
1
differential input low DC
VILdiff(DC)
NOTE 3
-0.150
V
1
differential input high AC
VIHdiff(AC)
2 x (VIH(AC) - VREF)
NOTE 3
V
2
differential input low AC
VILdiff(AC)
NOTE 3
2 x (VIL(AC) -VREF)
V
2
Note:
 Used to define a differential signal slew-rate.
 For CK_t - CK_c use VIH.CA/VIL.CA(AC) of ADD/CMD and VREFCA;
 These values are not defined; however, the differential signals CK_t - CK_c, need to be within the
respective limits (VIH.CA(DC) max, VIL.CA(DC)min) for single-ended signals as well as the limitations for
overshoot and undershoot.
Single-ended AC & DC output levels
Parameter
Symbol
DDR4-1600/1866/2133
Unit
Note
DC output high measurement level
VOH(DC)
1.1 x VDDQ
V
DC output mid measurement level
VOM(DC)
0.8 x VDDQ
V
DC output low measurement level
VOL(DC)
0.5 x VDDQ
V
AC output high measurement level
VOH(AC)
(0.7 + 0.15) x VDDQ
V
1
AC output low measurement level
VOL(AC)
(0.7 - 0.15) x VDDQ
V
1
Note:
 The swing of ± 0.15 × VDDQ is based on approximately 50% of the static single-ended output
peak-to-peak swing with a driver impedance of RZQ/7Ω and an effective test load of 50Ω to VTT = VDDQ.
Differential AC & DC output levels
Parameter
Symbol
DDR4-1600/1866/2133
Unit
Note
AC differential output high
measurement level
VOHdiff(AC)
+0.3 x VDDQ
V
1
AC differential output low
measurement level
VOLdiff(AC)
-0.3 x VDDQ
V
1
Note:
 The swing of ± 0.3 × VDDQ is based on approximately 50% of the static differential output peak-to-peak
swing with a driver impedance of RZQ/7Ω and an effective test load of 50Ω to VTT = VDDQ at each of the
differential outputs.