IMX53CEC datasheet(33/204 Pages) FREESCALE

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Electrical Characteristics

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

Freescale Semiconductor

4.3.3

Low Voltage I/O (LVIO) DC Parameters

The parameters in Table 15 are guaranteed per the operating ranges in Table 7, unless otherwise noted.

The LVIO pads operate only as inputs.

3 The single-ended signals need to be within the respective limits (Vih(dc) max, Vil(dc) min) for single-ended signals as well as

the limitations for overshoot and undershoot.

4 Use an off-chip pull resistor of less than 60 k

Ω to override this keeper.

Table 15. LVIO DC Electrical Characteristics

DC Electrical Characteristics

Symbol

Test Conditions

Min

Typ

Max

Unit

High-Level DC input voltage1, 2

1 Overshoot and undershoot conditions (transitions above OVDD and below GND) on switching pads must be held below 0.6 V,

and the duration of the overshoot/undershoot must not exceed 10% of the system clock cycle. Overshoot/undershoot must be

controlled through printed circuit board layout, transmission line impedance matching, signal line termination, or other

methods. Non-compliance to this specification may affect device reliability or cause permanent damage to the device.

2 To maintain a valid level, the transition edge of the input must sustain a constant slew rate (monotonic) from the current DC

level through to the target DC level, VIL or VIH. Monotonic input transition time is from 0.1 ns to 1 s. VIL and VIH do not apply

when hysteresis is enabled.

Vih

—

0.7

× OVDD

—

OVDD

Low-Level DC input voltage1, 2

Vil

—

0.3

× OVDD

Input Hysteresis

Vhys

OVDD = 1.875 V

OVDD = 2.775 V

0.35

0.62

1.27

—V

Schmitt trigger VT+2, 3

3 Hysteresis of 350 mV is guaranteed over all operating conditions when hysteresis is enabled.

VT+

—

0.5

× OVDD

—

Schmitt trigger VT–2, 3

VT–

—

0.5

× OVDD

Input current (no pull-up/down)

Iin

Vin = OVDD or 0 V

—

μA

Input current (22 k

Ω Pull-up)

Iin

Vin = 0 V

Vin = OVDD

—

161

μA

Input current (47 k

Ω Pull-up)

Iin

Vin = 0 V

Vin = OVDD

——

μA

Input current (100 k

Ω Pull-up)

Iin

Vin = 0 V

Vin = OVDD

——

μA

Input current (100 k

Ω Pull-down)

Iin

Vin = 0 V

Vin = OVDD

——

μA

Keeper Circuit Resistance

—

1304

4 Use an off-chip pull resistor of less than 60 k

Ω to override this keeper.

—k

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