MT40A4G4FSE-083E Datasheet, PDF (13/21 Pages) Micron Technology – TwinDie 1.2V DDR4 SDRAM

16Gb: x4, x8 TwinDie DDR4 SDRAM
Electrical Characteristics – AC and DC Output Measurement
Levels
Table 9: Single-Ended Output Slew Rate
For R_ON = R_ZQ/7
Parameter
Single-ended output slew rate
Symbol
SRQ_se
DDR4-1333 / 1866 / 2133 / 2400 /2666
Min
Max
2
7
Unit
V/ns
Notes: 1. SR = slew rate; Q = query output; se = single-ended signals
2. In two cases a maximum slew rate of 12V/ns applies for a single DQ signal within a byte
lane:
• Case 1 is defined for a single DQ signal within a byte lane that is switching into a cer-
tain direction (either from HIGH-to-LOW or LOW-to-HIGH) while all remaining DQ sig-
nals in the same byte lane are static (they stay at either HIGH or LOW).
• Case 2 is defined for a single DQ signal within a byte lane that is switching into a cer-
tain direction (either from HIGH-to-LOW or LOW-to-HIGH) while all remaining DQ sig-
nals in the same byte lane are switching into the opposite direction (from LOW-to-
HIGH or HIGH-to-LOW, respectively). For the remaining DQ signal switching into the
opposite direction, the standard maximum limit of 7 V/ns applies.
Differential Outputs
Table 10: Differential Output Levels
Parameter
AC differential output high measurement level (for output slew
rate)
AC differential output low measurement level (for output slew
rate)
Symbol
V_OH,diff(AC)
DDR4-1600 to DDR4-3200
0.3 × V_DDQ
Unit
V
V_OL,diff(AC)
–0.3 × V_DDQ
V
Note:
1. The swing of ±0.3 × V_DDQ is based on approximately 50% of the static single-ended out-
put peak-to-peak swing with a driver impedance of RZQ/7 and an effective test load of
50Ω to V_TT = V_DDQ at each differential output.
Using the same reference load used for timing measurements, output slew rate for fall-
ing and rising edges is defined and measured between V_OL,diff(AC) and V_OH,diff(AC) for dif-
ferential signals.
Table 11: Differential Output Slew Rate Definition
Description
Differential output slew rate for rising edge
Differential output slew rate for falling edge
Measured
From
To
V_OL,diff(AC)
V_OH,diff(AC)
V_OH,diff(AC)
V_OL,diff(AC)
Defined by
[V_OH,diff(AC) - V_OL,diff(AC)]/ΔTR_diff
[V_OH,diff(AC) - V_OL,diff(AC)]/ΔTF_diff
PDF: 09005aef85fd40a1
DDR4_16Gb_x4_x8_2CS_TwinDie.pdf - Rev. D 12/16 EN
13
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