k4b2g0446e Samsung Semiconductor, Inc., k4b2g0446e Datasheet - Page 14
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k4b2g0446e
Manufacturer Part Number
k4b2g0446e
Description
Ddp 2gb E-die Ddr3 Sdram
Manufacturer
Samsung Semiconductor, Inc.
Datasheet
1.K4B2G0446E.pdf
(59 pages)
- Current page: 14 of 59
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K4B2G0446E
K4B2G0846E
8.2 V
V
thermore V
which setup and hold is measured. System timing and voltage budgets need to account for V
data-eye of the input signals.
and voltage effects due to ac-noise on V
The dc-tolerance limits and ac-noise limits for the reference voltages V
The voltage levels for setup and hold time measurements V
"V
This clarifies, that dc-variations of V
This also clarifies that the DRAM setup/hold specification and derating values need to include time and voltage associated with V
V
REF
REF
REF
(t) as a function of time. (V
(DC) is the linear average of V
REF
" shall be understood as V
REF
Tolerances
(t) may temporarily deviate from V
voltage
REF
REF
Figure 1. Illustration of V
stands for V
(DC), as defined in Figure 1.
REF
REF
REF
(t) over a very long period of time (e.g. 1 sec). This average has to meet the min/max requiremts in table 7. Fur-
affect the absolute voltage a signal has to reach to achieve a valid high or low level and therefore the time to
up to the specified limit (+/-1% of V
REFCA
REF
(DC) by no more than ± 1% V
and V
IH
REFDQ
(AC), V
REF
Page 14 of 59
likewise).
(DC) tolerance and V
IH
(DC), V
REFCA
IL
and V
DD
(AC) and V
DD
) are included in DRAM timings and their associated deratings.
.
REFDQ
IL
are illustrate in Figure 1. It shows a valid reference voltage
(DC) are dependent on V
REF
REF
(DC) deviations from the optimum position within the
ac-noise limits
DDP 2Gb DDR3 SDRAM
V
V
SS
DD
time
REF
Rev. 1.0 March 2009
.
REF
ac-noise. Timing
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