K4B4G0446B Datasheet, PDF (19/59 Pages) Samsung semiconductor – DDP 4Gb B-die DDR3 SDRAM Specification

K4B4G0446B
K4B4G0846B
DDP 4Gb DDR3 SDRAM
9.4 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_OLdiff(AC) and
V_OHdiff(AC) for differential signals as shown inTable 18 and figure 7.
[ Table 18 ] Differential Output slew rate definition
Description
Differential output slew rate for rising edge
Differential output slew rate for falling edge
Measured
From
To
V_OLdiff(AC)
V_OHdiff(AC)
V_OHdiff(AC)
V_OLdiff(AC)
Defined by
V_OHdiff(AC)-V_OLdiff(AC)
Delta TRdiff
V_OHdiff(AC)-V_OLdiff(AC)
Delta TFdiff
Note : Output slew rate is verified by design and characterization, and may not be subject to production test.
[ Table 19 ] Differential Output slew rate
Parameter
Differential output slew rate
Symbol
SRQse
DDR3-800
Min
Max
5
10
Description : SR : Slew Rate
Q : Query Output (like in DQ, which stands for Data-in, Query-Output
diff : Singe-ended Signals
For Ron = RZQ/7 setting
DDR3-1066
Min
Max
5
10
DDR3-1333
Min
Max
5
10
DDR3-1600
Min
Max
TBD
10
Units
V/ns
V_OHdiff(AC)
V_TT
V_OLdiff(AC)
delta TFdiff
delta TRdiff
Figure 7. Differential Output Slew Rate definition
9.5 Reference Load for AC Timing and Output Slew Rate
Figure 8 represents the effective reference load of 25 ohms used in defining the relevant AC timing parameters of the device as well as output slew rate
measurements.
It is not intended as a precise representation of any particular system environment of a depiction of the actual load presented by a production tester. Sys-
tem designers should use IBIS or other simulation tools to correlate the timing reference load to a system environment. Manufacturers correlate to their
production test conditions, generally one or more coaxial transmission lines terminated at the tester electronics.
V_DDQ
CK/CK
DUT
DQ
DQS
DQS
25Ω
V_TT = V_DDQ/2
Reference
Point
Figure 8. Reference Load for AC Timing and Output Slew Rate
Page 19 of 59
Rev. 1.0 March 2009