MT40A256M16GE-075EAIT Datasheet, PDF (259/359 Pages) Micron Technology – Automotive DDR4 SDRAM

4Gb: x8, x16 Automotive DDR4 SDRAM
Electrical Characteristics – AC and DC Operating Conditions
V_REFDQ Ranges
11. If the V_REF monitor is enabled, V_REF must be derated by +10ns if DQ bus load is 0pF and
an additional +15 ns/pF of DQ bus loading.
12. Only applicable for DRAM component-level test/characterization purposes. Not applica-
ble for normal mode of operation. V_REF valid qualifies the step times, which will be char-
acterized at the component level.
MR6[6] selects range 1 (60% to 92.5% of V_DDQ) or range 2 (45% to 77.5% of V_DDQ), and
MR6[5:0] sets the V_REFDQ level, as listed in the following table. The values in MR6[6:0]
will update the V_DDQ range and level independent of MR6[7] setting. It is recommended
MR6[7] be enabled when changing the settings in MR6[6:0], and it is highly recommen-
ded MR6[7] be enabled when changing the settings in MR6[6:0] multiple times during a
calibration routine.
Table 82: V_REFDQ Range and Levels
MR6[5:0]
00 0000
00 0001
00 0010
00 0011
00 0100
00 0101
00 0110
00 0111
00 1000
00 1001
00 1010
00 1011
00 1100
00 1101
00 1110
00 1111
01 0000
01 0001
01 0010
01 0011
01 0100
01 0101
01 0110
01 0111
01 1000
01 1001
MR6[6] 0 =
Range 1
60.00%
60.65%
61.30%
61.95%
62.60%
63.25%
63.90%
64.55%
65.20%
65.85%
66.50%
67.15%
67.80%
68.45%
69.10%
69.75%
70.40%
71.05%
71.70%
72.35%
73.00%
73.65%
74.30%
74.95%
75.60%
76.25%
MR6[6] 1 =
Range 2
45.00%
45.65%
46.30%
46.95%
47.60%
48.25%
48.90%
49.55%
50.20%
50.85%
51.50%
52.15%
52.80%
53.45%
54.10%
54.75%
55.40%
56.05%
56.70%
57.35%
58.00%
58.65%
59.30%
59.95%
60.60%
61.25%
MR6[5:0]
01 1010
01 1011
01 1100
01 1101
01 1110
01 1111
10 0000
10 0001
10 0010
10 0011
10 0100
10 0101
10 0110
10 0111
10 1000
10 1001
10 1010
10 1011
10 1100
10 1101
10 1110
10 1111
11 0000
11 0001
11 0010
MR6[6] 0 =
Range 1
MR6[6] 1 =
Range 2
76.90%
61.90%
77.55%
62.55%
78.20%
63.20%
78.85%
63.85%
79.50%
64.50%
80.15%
65.15%
80.80%
65.80%
81.45%
66.45%
82.10%
67.10%
82.75%
67.75%
83.40%
68.40%
84.05%
69.05%
84.70%
69.70%
85.35%
70.35%
86.00%
71.00%
86.65%
71.65%
87.30%
72.30%
87.95%
72.95%
88.60%
73.60%
89.25%
74.25%
89.90%
74.90%
90.55%
75.55%
91.20%
76.20%
91.85%
76.85%
92.50%
77.50%
11 0011 to 11 1111 are reserved
CCMTD-1725822587-10418
4gb_auto_ddr4_sdram_z90b.pdf - Rev. D 01/17 EN
259
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