EDJ1108BABG-DG-E datasheet(9/148 Pages) ELPIDA

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EDJ1108BABG-DG-E Datasheet(PDF) 9 Page - Elpida Memory

Part #	EDJ1108BABG-DG-E

Description	1G bits DDR3 SDRAM

Download	148 Pages

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Manufacturer	ELPIDA [Elpida Memory]

Direct Link	http://www.elpida.com/en

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EDJ1108BABG, EDJ1116BABG

Data Sheet E1248E40 (Ver. 4.0)

VREF Tolerances

The dc-tolerance limits and ac-noise limits for the reference voltages VREFCA and VREFDQ are shown in Figure

VREF(DC) Tolerance and VREF AC-Noise Limits. It shows a valid reference voltage VREF(t) as a function of time.

(VREF stands for VREFCA and VREFDQ likewise).

VREF(DC) is the linear average of VREF(t) over a very long period of time (e.g. 1 sec). This average has to meet the

min/max requirements in the table of(Single-Ended AC and DC Input Levels for Command and Address).

Furthermore VREF(t) may temporarily deviate from VREF(DC) by no more than +/- 1% VDD.

VDD

VSS

VDD/2

VREF AC-noise

VREF(DC)max.

VREF(DC)min.

VREF(DC)

VREF(t)

voltage

time

VREF(DC) Tolerance and VREF AC-Noise Limits

The voltage levels for setup and hold time measurements VIH(AC), VIH(DC), VIL(AC) and VIL(DC) are dependent

on VREF.

VREF shall be understood as VREF(DC), as defined in figure above, VREF(DC) Tolerance and VREF AC-Noise

Limits.

This clarifies that DC-variations of VREF affect the absolute voltage a signal has to reach to achieve a valid high or

low level and therefore the time to which setup and hold is measured. System timing and voltage budgets need to

account for VREF(DC) deviations from the optimum position within the data-eye of the input signals.

This also clarifies that the DRAM setup/hold specification and derating values need to include time and voltage

associated with VREF AC-noise. Timing and voltage effects due to ac-noise on VREF up to the specified limit (

±1%

of VDD) are included in DRAM timings and their associated deratings.

Similar Part No. - EDJ1108BABG-DG-E

Manufacturer	Part #	Datasheet	Description
Elpida Memory	EDJ1108BASE	1Mb / 148P	1G bits DDR3 SDRAM
	EDJ1108BASE-8A-E	1Mb / 148P	1G bits DDR3 SDRAM
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Similar Description - EDJ1108BABG-DG-E

Manufacturer	Part #	Datasheet	Description
Elpida Memory	EDJ1104BDSE	1Mb / 147P	1G bits DDR3 SDRAM
	EDJ1104BFBG	1Mb / 147P	1G bits DDR3 SDRAM
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