IMX53IEC datasheet(30/173 Pages) FREESCALE

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i.MX53 Applications Processors for Industrial Products, Rev. 6

Freescale Semiconductor

Electrical Characteristics

4.3.3

Low Voltage I/O (LVIO) DC Parameters

The parameters in Table 14 are guaranteed per the operating ranges in Table 6, unless otherwise noted.

The LVIO pads operate only as inputs.

Over/undershoot peak

Vpeak

—

0.4

Over/undershoot area

(above OVDD or below OVSS)

Varea

—

0.67

V-ns

Termination Voltage

Vtt

Vtt tracking OVDD/2

0.49 x OVDD

Vref

0.51 x OVDD

Input current (no pull-up/down)

Iin

VI = 0 V

VI=OVDD

—

μA

Pull-up/Pull-down impedance mismatch

—

Minimum impedance

configuration

——

240

Ω unit calibration resolution

—

Keeper Circuit Resistance

—

1304

—k

1 OVDD— I/O power supply (1.425 V–1.575 V for DDR3)

2 Vref— DDR3 external reference voltage

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 kΩ to override this keeper.

Table 14. LVIO DC Electrical Characteristics

DC Electrical Characteristics

Symbol

Test Conditions

Min

Typ

Max

Unit

High-Level DC input voltage1, 2

Vih

Ioh = -0.8 mA

0.7

× OVDD

—

OVDD

Low-Level DC input voltage1, 2

Vil

Iol = 0.8 mA

—

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

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

—k

Table 13. DDR3 I/O DC Electrical Parameters (continued)

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