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MT40A1G8WE-075E Datasheet, PDF (295/358 Pages) Micron Technology – Refresh time of 8192-cycle at TC temperature range
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8Gb: x8, x16 Automotive DDR4 SDRAM
Electrical Characteristics – On-Die Termination Characteristics
Table 126: ODT DC Characteristics (Continued)
RTT
60 ohm
48 ohm
40 ohm
34 ohm
DQ-to-DQ mismatch
within byte
VOUT
VOL(DC) = 0.5 × VDDQ
VOM(DC) = 0.8 × VDDQ
VOH(DC) = 1.1 × VDDQ
VOL(DC) = 0.5 × VDDQ
VOM(DC) = 0.8 × VDDQ
VOH(DC) = 1.1 × VDDQ
VOL(DC) = 0.5 × VDDQ
VOM(DC) = 0.8 × VDDQ
VOH(DC) = 1.1 × VDDQ
VOL(DC) = 0.5 × VDDQ
VOM(DC) = 0.8 × VDDQ
VOH(DC) = 1.1 × VDDQ
VOM(DC) = 0.8 × VDDQ
Min
0.9
0.9
0.8
0.9
0.9
0.8
0.9
0.9
0.8
0.9
0.9
0.8
0
Nom
1
1
1
1
1
1
1
1
1
1
1
1
–
Max
1.25
1.1
1.1
1.25
1.1
1.1
1.25
1.1
1.1
1.25
1.1
1.1
10
Unit
RZQ/4
RZQ/4
RZQ/4
RZQ/5
RZQ/5
RZQ/5
RZQ/6
RZQ/6
RZQ/6
RZQ/7
RZQ/7
RZQ/7
%
Notes
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 4, 5, 6
Notes:
1. The tolerance limits are specified after calibration to 240 ohm ±1% resistor with stable
voltage and temperature. For the behavior of the tolerance limits if temperature or
voltage changes after calibration, see ODT Temperature and Voltage Sensitivity.
2. Micron recommends calibrating pull-up ODT resistors at 0.8 × VDDQ. Other calibration
schemes may be used to achieve the linearity specification shown here.
3. The tolerance limits are specified under the condition that VDDQ = VDD and VSSQ = VSS.
4. The DQ-to-DQ mismatch within byte variation for a given component including DQS_t
and DQS_c.
5. RTT variance range ratio to RTT nominal value in a given component, including DQS_t
and DQS_c.
DQ-to-DQ mismatch = RTT(MAX) - RTT(MIN) × 100
RTT(NOM)
6. DQ-to-DQ mismatch for a x16 device is treated as two separate bytes.
7. For IT, AT, and UT devices, the minimum values are derated by 9% when the device op-
erates between –40°C and 0°C (TC).
ODT Temperature and Voltage Sensitivity
If temperature and/or voltage change after calibration, the tolerance limits widen ac-
cording to the following equations and tables.
ǻT = T - T(@ calibration); ǻV = VDDQ - VDDQ(@ calibration); VDD = VDDQ
Table 127: ODT Sensitivity Definitions
Parameter
RTT@
Min
0.9 - dRTTdT × |ΔT| - dRTTdV × |ΔV|
Max
1.6 + dRTTdTH × |ΔT| + dRTTdVH × |ΔV|
Unit
RZQ/n
CCMTD-1406124318-10419
8gb_auto_ddr4_dram.pdf - Rev. C 3/17 EN
295
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