Samsung M471B1G73AH0 specifications Slew Rate Definition for Single Ended Input Signals

Unbuffered SODIMM

datasheet

Rev. 1.0

DDR3 SDRAM

10.3.4 Differential Input Cross Point Voltage

To guarantee tight setup and hold times as well as output skew parameters with respect to clock and strobe, each cross point voltage of differential input signals (CK, CK and DQS, DQS) must meet the requirements in below table. The differential input cross point voltage VIX is measured from the actual cross point of true and complement signal to the mid level between of VDD and VSS.

VDD

CK, DQS

VIX

VDD/2

VIX

VIX

					CK, DQS
					VSS
			Figure 4. VIX Definition
[ Table 5 ] Cross point voltage for differential input signals (CK, DQS)
Symbol		Parameter		DDR3-800/1066/1333/1600			Unit	NOTE
				Min		Max
VIX				-150		150	mV
	Differential Input Cross Point Voltage relative to VDD/2 for CK,CK
				-175		175	mV	1
VIX	Differential Input Cross Point Voltage relative to VDD/2 for DQS,DQS			-150		150	mV

NOTE :

1.Extended range for VIX is only allowed for clock and if single-ended clock input signals CK and CK are monotonic, have a single-ended swing VSEL / VSEH of at least VDD/2 ±250 mV, and the differential slew rate of CK-CK is larger than 3 V/ ns.

10.4 Slew Rate Definition for Single Ended Input Signals

See "Address / Command Setup, Hold and Derating" for single-ended slew rate definitions for address and command signals. See "Data Setup, Hold and Slew Rate Derating" for single-ended slew rate definitions for data signals.

10.5 Slew rate definition for Differential Input Signals

Input slew rate for differential signals (CK, CK and DQS, DQS) are defined and measured as shown in below.

[ Table 6 ] Differential input slew rate definition

Description					Measured		Defined by
					From	To
					VILdiffmax	VIHdiffmin	VIHdiffmin - VILdiffmax
Differential input slew rate for rising edge (CK-CK and DQS-DQS)
							Delta TRdiff
					VIHdiffmin	VILdiffmax	VIHdiffmin - VILdiffmax
Differential input slew rate for falling edge (CK-CK and DQS-DQS)
							Delta TFdiff
NOTE : The differential signal (i.e. CK -		and DQS -		must be linear between these thresholds
	CK		DQS)

	VIHdiffmin
	0
	VILdiffmax
delta TFdiff	delta TRdiff

Figure 5. Differential input slew rate definition for DQS, DQS and CK, CK

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