IMX53CEC datasheet(43/204 Pages) FREESCALE

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Electrical Characteristics

i.MX53xD Applications Processors for Consumer Products, Rev. 2

Freescale Semiconductor

4.5.3

LVIO I/O AC Electrical Characteristics

AC electrical characteristics for LVIO I/O in slow and fast modes are presented in the Table 26 and

Table 27, respectively. Note that the fast or slow I/O behavior is determined by the appropriate control bit

in the IOMUXC control registers.

Output AC differential cross point voltage4

Vox(ac)

—

Vref – 0.15

—

Vref + 0.15

Single output slew rate

tsr

At 25

Ω to Vref

2.5

—

V/ns

Skew between pad rise/fall asymmetry +

skew caused by SSN

tSKD

clk=266MHz

clk=400MHz

——

0.2

0.1

1 Note that the JEDEC JESD79_3C specification supersedes any specification in this document.

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).

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.

4 The typical value of Vox(ac) is expected to be about 0.5 * OVDD and Vox(ac) is expected to track variation in OVDD. Vox(ac)

indicates the voltage at which differential output signal must cross.

Table 26. LVIO I/O AC Parameters in Slow Mode

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

Input Transition Times1

1 Hysteresis mode is recommended for inputs with transition times greater than 25 ns.

trm

—

Table 25. LPDDR2 I/O DDR3 mode AC Characteristics1 (continued)

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

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