K4B1G0446D Datasheet, PDF (18/60 Pages) Samsung semiconductor – 1Gb D-die DDR3 SDRAM Specification

K4B1G04(08/16)46D
1Gb DDR3 SDRAM
8.4 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 V_IX is measured from the actual
cross point of true and complement signal to the mid level between of V_DD and V_SS.
V_DD
CK, DQS
V_IX
V_IX
V_IX
V_DD/2
CK, DQS
V_SS
Figure 4. V_IX Definition
[ Table 12 ] Cross point voltage for differential input signals (CK, DQS)
Symbol
Parameter
V_IX
Differential Input Cross Point Voltage relative to V_DD/2 for CK,CK
V_IX
Differential Input Cross Point Voltage relative to V_DD/2 for DQS,DQS
DDR3-800/1066/1333/1600
Min
Max
-150
150
-175
175
-150
150
Unit Notes
mV
mV
1
mV
Note :
1. Extended range for V_IX is only allowed for clock and if single-ended clock input signals CKand CK are monotonic, have a single-ended swing V_SEL /
V_SEH of at least V_DD/2 =/-250 mV, and the differential slew rate of CK-CK is larger than 3 V/ ns. Refer to table 11 on page 17 for V_SEL and V_SEH stan-
dard values.
8.5 Slew Rate Definition for Single Ended Input Signals
See 14.3 "Address / Command Setup, Hold and Derating" for single-ended slew rate definitions for address and command signals.
See 14.4 "Data Setup, Hold and Slew Rate Derating" for single-ended slew rate definitions for data signals.tDH nominal slew rate for a falling signal is
defined as the slew rate between the last crossing of V_IH(DC)min and the first crossing of V_REF
8.6 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 Table 13 and Figure 5.
[ Table 13 ] Differential input slew rate definition
Description
Differential input slew rate for rising edge (CK-CK and DQS-DQS)
Measured
From
To
V_ILdiffmax
V_IHdiffmin
Differential input slew rate for falling edge (CK-CK and DQS-DQS)
V_IHdiffmin
V_ILdiffmax
Note : The differential signal (i.e. CK - CK and DQS - DQS) must be linear between these thresholds
Defined by
V_IHdiffmin - V_ILdiffmax
Delta TRdiff
V_IHdiffmin - V_ILdiffmax
Delta TFdiff
V_IHdiffmin
0
V_ILdiffmax
delta TFdiff
delta TRdiff
Figure 5. Differential Input Slew Rate definition for DQS, DQS and CK, CK
Page 18 of 60
Rev. 1.1 August 2008