i.MX 6UltraLite Applications Processors for Consumer Products, Rev. 2.2, 05/2017
38 NXP Semiconductors
Electrical characteristics
4.7.2 DDR I/O AC parameters
The Multi-mode DDR Controller (MMDC) is compatible with JEDEC-compliant SDRAMs. For details
on supported DDR memory configurations, see Section 4.10, “Multi-Mode DDR Controller (MMDC)".
MMDC operation with the standards stated above is contingent upon the board DDR design adherence to
the DDR design and layout requirements stated in the Hardware Development Guide for the i.MX
6UltraLite Applications Processor (IMX6ULHDG).
Table 31 shows the AC parameters for DDR I/O operating in LPDDR2 mode.
Table 29. General Purpose I/O AC Parameters 1.8 V Mode
Parameter Symbol Test Condition Min Typ Max Unit
Output Pad Transition Times, rise/fall
(Max Drive, ipp_dse=111)
tr, tf 15 pF Cload, slow slew rate
15 pF Cload, fast slew rate —— 2.72/2.79
1.51/1.54
ns
Output Pad Transition Times, rise/fall
(High Drive, ipp_dse=101)
tr, tf 15 pF Cload, slow slew rate
15 pF Cload, fast slew rate —— 3.20/3.36
1.96/2.07
Output Pad Transition Times, rise/fall
(Medium Drive, ipp_dse=100)
tr, tf 15 pF Cload, slow slew rate
15 pF Cload, fast slew rate —— 3.64/3.88
2.27/2.53
Output Pad Transition Times, rise/fall
(Low Drive. ipp_dse=011)
tr, tf 15 pF Cload, slow slew rate
15 pF Cload, fast slew rate —— 4.32/4.50
3.16/3.17
Input Transition Times1
1Hysteresis mode is recommended for inputs with transition times greater than 25 ns.
trm — — — 25 ns
Table 30. General Purpose I/O AC Parameters 3.3 V Mode
Parameter Symbol Test Condition Min Typ Max Unit
Output Pad Transition Times, rise/fall
(Max Drive, ipp_dse=101)
tr, tf 15 pF Cload, slow slew rate
15 pF Cload, fast slew rate —— 1.70/1.79
1.06/1.15
ns
ns
Output Pad Transition Times, rise/fall
(High Drive, ipp_dse=011)
tr, tf 15 pF Cload, slow slew rate
15 pF Cload, fast slew rate —— 2.35/2.43
1.74/1.77
Output Pad Transition Times, rise/fall
(Medium Drive, ipp_dse=010)
tr, tf 15 pF Cload, slow slew rate
15 pF Cload, fast slew rate —— 3.13/3.29
2.46/2.60
Output Pad Transition Times, rise/fall
(Low Drive. ipp_dse=001)
tr, tf 15 pF Cload, slow slew rate
15 pF Cload, fast slew rate —— 5.14/5.57
4.77/5.15
Input Transition Times1
1Hysteresis mode is recommended for inputs with transition times greater than 25 ns.
trm — — — 25 ns
Table 31. DDR I/O LPDDR2 Mode AC Parameters1
Parameter Symbol Test Condition Min Max Unit
AC input logic high Vih(ac) — Vref + 0.22 OVDD V
AC input logic low Vil(ac) — 0 Vref - 0.22 V
AC differential input high voltage2Vidh(ac) — 0.44 — V