Datasheet
Table 63. ODT Electrical Characteristics RZQ=240Ω ±1% entire temperature operation range; after
proper ZQ calibration
R
TT
Vout
Min.
Nom.
Max.
Unit
Note
240Ω
V
OL
dc= 0.5 x V
DDQ
0.9
1
1.25
RZQ
1,2,3
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ
1,2,3
V
OH
dc= 1.1 x V
DDQ
0.8
1
1.1
RZQ
1,2,3
120Ω
V
OL
dc= 0.5 x V
DDQ
0.9
1
1.25
RZQ/2
1,2,3
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ/2
1,2,3
V
OH
dc= 1.1 x V
DDQ
0.8
1
1.1
RZQ/2
1,2,3
80Ω
V
OL
dc= 0.5 x V
DDQ
0.9
1
1.25
RZQ/3
1,2,3
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ/3
1,2,3
V
OH
dc= 1.1 x V
DDQ
0.8
1
1.1
RZQ/3
1,2,3
60Ω
V
OL
dc= 0.5 x V
DDQ
0.9
1
1.25
RZQ/4
1,2,3
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ/4
1,2,3
V
OH
dc= 1.1 x V
DDQ
0.8
1
1.1
RZQ/4
1,2,3
48Ω
V
OL
dc= 0.5 x V
DDQ
0.9
1
1.25
RZQ/5
1,2,3
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ/5
1,2,3
V
OH
dc= 1.1 x V
DDQ
0.8
1
1.1
RZQ/5
1,2,3
40Ω
V
OL
dc= 0.5 x V
DDQ
0.9
1
1.25
RZQ/6
1,2,3
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ/6
1,2,3
V
OH
dc= 1.1 x V
DDQ
0.8
1
1.1
RZQ/6
1,2,3
34Ω
V
OL
dc= 0.5 x V
DDQ
0.9
1
1.25
RZQ/7
1,2,3
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ/7
1,2,3
V
OH
dc= 1.1 x V
DDQ
0.8
1
1.1
RZQ/7
1,2,3
DQ-DQ Mismatch within byte
V
OM
dc= 0.8 x V
DDQ
0
-
10
%
1,2,4,5,6
Note 1. The tolerance limits are specified after calibration with stable voltage and temperature. For the behavior of the tolerance limits if
temperature or voltage changes after calibration, see following section on voltage and temperature sensitivity.
Note 2. Pull-up ODT resistors are recommended to be calibrated at 0.8 x V
DDQ
. Other calibration schemes may be used to achieve the
linearity spec shown above, e.g. calibration at 0.5 x V
DDQ
and 1.1 x V
DDQ
.
Note 3. The tolerance limits are specified under the condition that V
DDQ
=V
DD
and V
SSQ
=V
SS
.
Note 4. DQ to DQ mismatch within byte variation for a given component including DQS and DQS#. (characterized)
Note 5. R
TT
variance range ratio to R
TT
Nominal value in a given component, including DQS and DQS#.
DQ-DQ Mismatch in a Device =
R
TTMax
- R
TTMin
R
TTNOM
X 100
Note 6. This parameter of x16 device is specified for Upper byte and Lower byte.
AS4C256M16D4
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Rev.1.0 Aug.2019