MT40A2G4PM-083E Datasheet, PDF (126/373 Pages) Micron Technology – Programmable data strobe preambles

Table 38: V_REFDQ Settings (V_DDQ = 1.2V)
R_ON
34 ohm
48 ohm
ODT
34 ohm
40 ohm
48 ohm
60 ohm
80 ohm
120 ohm
240 ohm
34 ohm
40 ohm
48 ohm
60 ohm
80 ohm
120 ohm
240 ohm
Vx – V_IN LOW (mV)
600
550
500
435
360
265
150
700
655
600
535
450
345
200
Figure 72: V_REFDQ Equivalent Circuit
V_DDQ
R_ON
8Gb: x4, x8, x16 DDR4 SDRAM
V_REFDQ Calibration
V_REFDQ (mv)
900
875
850
815
780
732
675
950
925
900
865
825
770
700
V_DDQ
ODT
RXer
Vx
V_REFDQ
(internal)
V_REFDQ (%V_DDQ)
75%
73%
71%
68%
65%
61%
56%
79%
77%
75%
72%
69%
64%
58%
09005aef861d1d4a
8gb_ddr4_dram.pdf - Rev. G 1/17 EN
126
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