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Unbuffered DIMM
12.4 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
(AC) for differential signals as shown in below.
diff
[ Table 14 ] Differential Output slew rate definition
Description
Differential output slew rate for rising edge
Differential output slew rate for falling edge
NOTE : Output slew rate is verified by design and characterization, and may not be subject to production test.
[ Table 15 ] Differential Output slew rate
Parameter
Single ended output slew rate
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
datasheet
From
V
(AC)
OLdiff
V
(AC)
OHdiff
DDR3-800
Operation
Symbol
Voltage
Min
1.35V
3.5
SRQdiff
1.5V
5
TFdiff
delta
Figure 8. Differential output slew rate definition
Measured
To
V
(AC)
OHdiff
V
(AC)
OLdiff
DDR3-1066
Max
Min
Max
12
3.5
12
10
5
10
V
V
V
TRdiff
delta
- 21 -
DDR3L SDRAM
Defined by
V
(AC)-V
(AC)
OHdiff
OLdiff
Delta TRdiff
V
(AC)-V
(AC)
OHdiff
OLdiff
Delta TFdiff
DDR3-1333
DDR3-1600
Min
Max
Min
3.5
12
3.5
5
10
5
(AC)
OHdiff
TT
(AC)
OLdiff
Rev. 1.0
(AC) and V
OLdiff
OH-
Units
Max
12
V/ns
10
V/ns
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