Datasheet

Table 93. Output Driver DC Electrical Characteristics, assuming RZQ = 240ohm; entire operating
temperature range; after proper ZQ calibration
R
ON_NOM
Resistor
Vout
Min.
Nom.
Max.
Unit
Note
34Ω
R
ON
34Pd
V
OL
dc= 0.5 x V
DDQ
0.8
1
1.1
RZQ/7
1,2
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ/7
1,2
V
OH
dc= 1.1 x V
DDQ
0.9
1
1.25
RZQ/7
1,2
R
ON
34Pu
V
OL
dc= 0.5 x V
DDQ
0.9
1
1.25
RZQ/7
1,2
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ/7
1,2
V
OH
dc= 1.1 x V
DDQ
0.8
1
1.1
RZQ/7
1,2
48Ω
R
ON
48Pd
V
OL
dc= 0.5 x V
DDQ
0.8
1
1.1
RZQ/5
1,2
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ/5
1,2
V
OH
dc= 1.1 x V
DDQ
0.9
1
1.25
RZQ/5
1,2
R
ON
48Pu
V
OL
dc= 0.5 x V
DDQ
0.9
1
1.25
RZQ/5
1,2
V
OM
dc= 0.8 x V
DDQ
0.9
1
1.1
RZQ/5
1,2
V
OH
dc= 1.1 x V
DDQ
0.8
1
1.1
RZQ/5
1,2
Mismatch between pull-up
and pull-down, MMPuPd
V
OM
dc= 0.8 x V
DDQ
-10
-
10
%
1,2,3,4
Mismatch DQ-DQ within byte
variation pull-up, MMPudd
V
OM
dc= 0.8 x V
DDQ
-
-
10
%
1,2,4
Mismatch DQ-DQ within byte
variation pull-dn, MMPddd
V
OM
dc= 0.8 x V
DDQ
-
-
10
%
1,2,4
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 (TBD).
Note 2. Pull-up and pull-dn output driver impedances 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. Measurement definition for mismatch between pull-up and pull-down, MMPuPd: Measure R
ON
Pu and R
ON
Pd both at 0.8 x V
DDQ
separately; R
ON_NOM
is the nominal R
ON
value.
MMPuPd =
R
TTNOM
X 100
R
ON
Pu - R
ON
Pd
Note 4. R
ON
variance range ratio to R
ON
Nominal value in a given component, including DQS and DQS#.
MMPudd =
R
TTNOM
X 100
R
ON
PuMax - R
ON
PdMin
MMPddd =
R
TTNOM
X 100
R
ON
PdMax - R
ON
PdMin
Note 5. This parameter of x16 device is specified for Upper byte and Lower byte.
AS4C256M16D4
Confidential
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Rev.1.0 Aug.2019