Datasheet

Single-ended Output Slew Rate
With the reference load for timing measurements, output slew rate for falling and rising edges is defined and
measured between V
OL(AC)
and V
OH(AC)
for single ended signals.
Table 98. Single-ended output slew rate definition
Description
Measured
Defined by
From
To
Single ended output slew rate for rising edge
V
OL(AC)
V
OH(AC)
[V
OH(AC)
-V
OL(AC)
] / Delta TRse
Single ended output slew rate for falling edge
V
OH(AC)
V
OL(AC)
[V
OH(AC)
-V
OL(AC)
] / Delta TFse
Note 1. Output slew rate is verified by design and characterization, and may not be subject to production test.
Table 99. Single-ended output slew rate
Symbol
Parameter
DDR4-2400/2666
Unit
Min.
Max.
SRQse
Single ended output slew rate
4
9
V/ns
Description:
SR: Slew Rate
Q: Query Output (like in DQ, which stands for Data-in, Query-Output)
se: Single-ended Signals
For R
ON
= RZQ/7 setting
Note 1. In two cases, a maximum slew rate of 12 V/ns applies for a single DQ signal within a byte lane.
- Case 1 is defined for a single DQ signal within a byte lane which is switching into a certain direction (either from high to low or low to
high) while all remaining DQ signals in the same byte lane are static (i.e. they stay at either high or low).
- Case 2 is defined for a single DQ signal within a byte lane which is switching into a certain direction (either from high to low or low to
high) while all remaining DQ signals in the same byte lane are switching into the opposite direction (i.e. from low to high or high to low
respectively). For the remaining DQ signal switching into the opposite direction, the regular maximum limit of 9 V/ns applies.
Differential Output Slew Rate
With the reference load for timing measurements, output slew rate for falling and rising edges is defined and
measured between V
OLdiff(AC)
and V
OHdiff(AC)
for differential signals.
Table 100. Differential output slew rate definition
Description
Measured
Defined by
From
To
Differential output slew rate for rising edge
V
OLdiff(AC)
V
OHdiff(AC)
[V
OHdiff(AC)
-V
OLdiff(AC)
] / Delta TRdiff
Differential output slew rate for falling edge
V
OHdiff(AC)
V
OLdiff(AC)
[V
OHdiff(AC)
-V
OLdiff(AC)
] / Delta TFdiff
Note 1. Output slew rate is verified by design and characterization, and may not be subject to production test.
Table 101. Differential output slew rate
Symbol
Parameter
DDR4-2400/2666
Unit
Min.
Max.
SRQdiff
Differential output slew rate
8
18
V/ns
Description:
SR: Slew Rate
Q: Query Output (like in DQ, which stands for Data-in, Query-Output)
diff: Differential Signals
For Ron = RZQ/7 setting
AS4C256M16D4
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Rev.1.0 Aug.2019