Datasheet

i.MX 6Dual/6Quad Automotive and Infotainment Applications Processors, Rev. 6, 11/2018
46 NXP Semiconductors
Electrical Characteristics
4.7.2 DDR I/O AC Parameters
For details on supported DDR memory configurations, see Section 4.10.2, “MMDC Supported
DDR3/DDR3L/LPDDR2 Configurations.”
Table 30 shows the AC parameters for DDR I/O operating in LPDDR2 mode.
Table 31 shows the AC parameters for DDR I/O operating in DDR3/DDR3L mode.
Table 30. DDR I/O LPDDR2 Mode AC Parameters
1
1
Note that the JEDEC LPDDR2 specification (JESD209_2B) supersedes any specification in this document.
Parameter Symbol Test Condition Min Typ 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 voltage
2
2
Vid(ac) specifies the input differential voltage |Vtr – Vcp| required for switching, where Vtr is the “true” input signal and Vcp is
the “complementary” input signal. The Minimum value is equal to Vih(ac) – Vil(ac).
Vidh(ac) — 0.44 — — V
AC differential input low voltage Vidl(ac) — — — 0.44 V
Input AC differential cross point voltage
3
3
The typical value of Vix(ac) is expected to be about 0.5 × OVDD. and Vix(ac) is expected to track variation of OVDD. Vix(ac)
indicates the voltage at which differential input signal must cross.
Vix(ac) Relative to Vref -0.12 — 0.12 V
Over/undershoot peak Vpeak — — — 0.35 V
Over/undershoot area (above OVDD
or below OVSS)
Varea 400 MHz — — 0.2 V-ns
Single output slew rate, measured
between Vol(ac) and Voh(ac)
tsr 50 Ω to Vref.
5 pF load.
Drive impedance = 4 0 Ω ±30%
1.5 — 3.5 V/ns
50 Ω to Vref.
5pF load.
Drive impedance = 60 Ω ±30%
1—2.5
Skew between pad rise/fall asymmetry +
skew caused by SSN
t
SKD
clk = 400 MHz
——
0.1 ns
Table 31. DDR I/O DDR3/DDR3L Mode AC Parameters
1
Parameter Symbol Test Condition Min Typ Max Unit
AC input logic high Vih(ac) — Vref + 0.175 — OVDD V
AC input logic low Vil(ac) — 0 — Vref – 0.175 V
AC differential input voltage
2
Vid(ac) — 0.35 — — V
Input AC differential cross point voltage
3
Vix(ac) Relative to Vref Vref – 0.15 — Vref + 0.15 V
Over/undershoot peak Vpeak — — — 0.4 V
Over/undershoot area (above OVDD
or below OVSS)
Varea 533 MHz — — 0.5 V-ns