M391B1G73BH0 SAMSUNG [Samsung semiconductor], M391B1G73BH0 Datasheet - Page 16

• Manufacturer Part Number: M391B1G73BH0
• Description: 240pin Unbuffered DIMM based on 4Gb B-die
• Manufacturer: SAMSUNG [Samsung semiconductor]

Unbuffered DIMM
12.3 AC and DC Logic Input Levels for Differential Signals
12.3.1 Differential Signals Definition
12.3.2 Differential Swing Requirement for Clock (CK - CK) and Strobe (DQS - DQS)
NOTE :
1. Used to define a differential signal slew-rate.
2. for CK - CK use V
3. These values are not defined, however they single-ended signals CK, CK, DQS, DQS, DQSL need to be within the respective limits (V
[ Table 4 ] Allowed time before ringback (tDVAC) for CK - CK and DQS - DQS.
Slew Rate [V/ns]
then the reduced level applies also here.
ended signals as well as the limitations for overshoot and undershoot. Refer to "overshoot and Undersheet Specification"
V
V
Symbol
IHdiff
ILdiff
> 4.0
< 1.0
V
V
4.0
3.0
2.0
1.8
1.6
1.4
1.2
1.0
IHdiff
ILdiff
(AC)
(AC)
IH
/V
IL
tDVAC [ps] @ |V
(AC) of ADD/CMD and V
differential input high ac
differential input low ac
min
differential input high
75
57
50
38
34
29
22
13
differential input low
0
0
Parameter
= 350mV
Figure 3. Definition of differential ac-swing and "time above ac level" tDVAC
IH/Ldiff
V
V
IL
IH
.DIFF.AC.MAX
max
.DIFF.AC.MIN
V
V
REFCA
-
-
-
-
-
-
-
-
-
-
IL
IH
(AC)|
.DIFF.MAX
.DIFF.MIN
; for DQS - DQS use V
0.0
tDVAC [ps] @ |V
datasheet
min
175
170
167
163
162
161
159
155
150
150
2 x (V
= 300mV
NOTE 3
NOTE 3
IH
+0.2
min
(AC) - V
IH
half cycle
DDR3-800/1066/1333/1600/1866
/V
IH/Ldiff
IL
(AC) of DQs and V
- 16 -
max
tDVAC
REF
-
-
-
-
-
-
-
-
-
-
(AC)|
)
tDVAC [ps] @ |V
REFDQ
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
min
2 x (V
; if a reduced ac-high or ac-low level is used for a signal group,
= 270mV
NOTE 3
NOTE 3
IL
max
(AC) - V
-0.2
tDVAC
IH/Ldiff
max
REF
-
-
-
-
-
-
-
-
-
-
(AC)|
)
time
IH
tDVAC [ps] @ |V
DDR3 SDRAM
(DC) max, V
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
min
unit
V
V
V
V
= 250mV
IL
(DC)min) for single-
IH/Ldiff
NOTE
Rev. 1.3
max
1
1
2
2
-
-
-
-
-
-
-
-
-
-
(AC)|