Hynix HMT42GR7BFR4A-PBT8 User Manual
Rev. 1.0 / May. 2014
32
Differential swing requirements for clock (CK - CK) and strobe (DQS-DQS)
Notes:
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
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.
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 41.
tions for overshoot and undershoot. Refer to "Overshoot and Undershoot Specifications" on page 41.
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.
equal to or less than VIL(ac) level.
Differential AC and DC Input Levels
Symbol
Parameter
DDR3L-800, 1066, 1333, 1600
Unit Notes
Min
Max
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
Allowed time before ringback
(tDVAC) for CK - CK and DQS - DQS
Slew Rate
[V/ns]
DDR3L-800/1066/1333/1600
DDR3L-1866
tDVAC [ps]
@ |VIH/Ldiff
(ac)| = 320mV
tDVAC [ps]
@ |VIH/Ldiff
(ac)| = 270mV
tDVAC [ps]
@ |VIH/Ldiff
(ac)| = 270mV
tDVAC [ps]
@ |VIH/Ldiff
(ac)| = 250mV
tDVAC [ps]
@ |VIH/Ldiff
(ac)| = 260mV
min
max
min
max
min
max
min
max
min
max
> 4.0
189
-
201
-
163
-
168
-
176
-
4.0
189
-
201
-
163
-
168
-
176
-
3.0
162
-
179
-
140
-
147
-
154
-
2.0
109
-
134
95
105
111
1.8
91
-
119
-
80
-
91
-
97
-
1.6
69
-
100
-
62
-
74
-
78
-
1.4
40
-
76
-
37
-
52
-
56
-
1.2
note
-
44
-
5
-
22
-
24
-
1.0
note
-
note
-
note
-
note
-
note
-
< 1.0
note
-
note
-
note
-
note
-
note
-