HMT451V7MFR8C Datasheet, PDF (31/67 Pages) Hynix Semiconductor – DDR3 SDRAM VLP Registered DIMM Based on 4Gb M-die

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 table below. The differential input cross point voltage VIX is measured from the actual
cross point of true and complement signals to the midlevel between of VDD and VSS
Vix Definition
Cross point voltage for differential input signals (CK, DQS)
Symbol
Parameter
DDR3-800, 1066, 1333, 1600
Min
Max
Unit Notes
V_IX(CK)
Differential Input Cross Point Voltage
relative to VDD/2 for CK, CK
-150
-175
150
mV 2
175
mV 1
V_IX(DQS)
Differential Input Cross Point Voltage
relative to VDD/2 for DQS, DQS
-150
150
mV 2
Notes:
1. Extended range for V_IX is only allowed for clock and if single-ended clock input signals CK and CK are
monotonic with a single-ended swing VSEL / VSEH of at least VDD/2 +/-250 mV, and when the differential
slew rate of CK - CK is larger than 3 V/ns.
2. The relation between Vix Min/Max and VSEL/VSEH should satisfy following.
(VDD/2) + Vix (Min) - VSEL  25mV 
VSEH - ((VDD/2) + Vix (Max))  25mV
Rev. 1.0 / Aug. 2012
31