Samsung M471B1G73AH0 AC & DC Output Measurement Levels, Single Ended AC and DC Output Levels

Unbuffered SODIMM

datasheet

Rev. 1.0

DDR3 SDRAM

11. AC & DC Output Measurement Levels

11.1 Single Ended AC and DC Output Levels

[ Table 7 ] Single Ended AC and DC output levels

Symbol	Parameter	DDR3-800/1066/1333/1600	Units	NOTE
VOH(DC)	DC output high measurement level (for IV curve linearity)	0.8 x VDDQ	V
VOM(DC)	DC output mid measurement level (for IV curve linearity)	0.5 x VDDQ	V
VOL(DC)	DC output low measurement level (for IV curve linearity)	0.2 x VDDQ	V
VOH(AC)	AC output high measurement level (for output SR)	VTT + 0.1 x VDDQ	V	1
VOL(AC)	AC output low measurement level (for output SR)	VTT - 0.1 x VDDQ	V	1

NOTE : 1. The swing of +/-0.1 x VDDQ is based on approximately 50% of the static single ended output high or low swing with a driver impedance of 40Ω and an effective test load of 25Ω to VTT=VDDQ/2.

11.2 Differential AC and DC Output Levels

[ Table 8 ] Differential AC and DC output levels

Symbol	Parameter	DDR3-800/1066/1333/1600	Units	NOTE
VOHdiff(AC)	AC differential output high measurement level (for output SR)	+0.2 x VDDQ	V	1
VOLdiff(AC)	AC differential output low measurement level (for output SR)	-0.2 x VDDQ	V	1

NOTE : 1. The swing of +/-0.2xVDDQis based on approximately 50% of the static single ended output high or low swing with a driver impedance of 40Ω and an effective test load of 25Ω to VTT=VDDQ/2 at each of the differential outputs.

11.3 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 VOL(AC) and VOH(AC) for single ended signals as shown in below.

[ Table 9 ] Single ended Output slew rate definition

Description	Measured		Defined by
	From	To
Single ended output slew rate for rising edge	VOL(AC)	VOH(AC)	VOH(AC)-VOL(AC)
			Delta TRse
Single ended output slew rate for falling edge	VOH(AC)	VOL(AC)	VOH(AC)-VOL(AC)
			Delta TFse

NOTE : Output slew rate is verified by design and characterization, and may not be subject to production test.

[ Table 10 ] Single ended output slew rate

Parameter	Symbol	DDR3-800		DDR3-1066		DDR3-1333		DDR3-1600		Units
		Min	Max	Min	Max	Min	Max	Min	Max
Single ended output slew rate	SRQse	2.5	5	2.5	5	2.5	5	2.5	5	V/ns

Description : SR : Slew Rate

Q : Query Output (like in DQ, which stands for Data-in, Query-Output)

se : Single-ended Signals For Ron = RZQ/7 setting

VOHdiff(AC)

VTT

VOLdiff(AC)

delta TFdiff delta TRdiff

Figure 6. Single-ended output slew rate definition

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