NTC Proprietary
Level: Property
DDR3(L)-2Gb SDRAM
NT5CB(C)256M8JQ/NT5CB(C)128M16JR
DDR3 Differential AC and DC Input Levels for clock (CK - ) and strobe (DQS - )
DDR3- 1600
Symbol
Parameter
Unit
Notes
Min
+ 0.200
Max
Note 3
1
1
2
2
VIHdiff
VILdiff
Differential input high
Differential input logic low
Differential input high ac
Differential input low ac
V
V
V
V
Note 3
- 0.200
VIHdiff(ac)
VILdiff(ac)
2 x (VIH(ac) - Vref)
Note 3
Note 3
2 x (VIL(ac) - Vref)
NOTE 1. Used to define a differential signal slew-rate.
NOTE 2. For CK - use VIH/VIL(ac) of ADD/CMD and VREFCA; for DQS - , DQSL, L, DQSU ,U 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.
NOTE 3. These values are not defined; however, the single-ended signals CK, , DQS, , DQSL, L, DQSU,
U 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 Specifications”
DDR3L Differential AC and DC Input Levels for clock (CK - ) and strobe (DQS - )
DDR3L- 1600 & 1866
Symbol
Parameter
Unit
Notes
Min
+ 0.180
Max
Note 3
1
1
2
2
VIHdiff
VILdiff
Differential input high
Differential input logic low
Differential input high ac
Differential input low ac
V
V
V
V
Note 3
- 0.180
VIHdiff(ac)
VILdiff(ac)
2 x (VIH(ac) - Vref)
Note 3
Note 3
2 x (VIL(ac) - Vref)
NOTE 1 Used to define a differential signal slew-rate.
NOTE 2 For CK - use VIH/VIL(AC) of ADD/CMD and VREFCA; for DQS - , DQSL, L, DQSU , U 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.
NOTE 3 These values are not defined, however the single-ended signals CK, , DQS, , DQSL, L, DQSU, U 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 Specifications”.
Version 1.4
05/2019
91
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