IMX53CEC datasheet(32/204 Pages) FREESCALE

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

Freescale Semiconductor

Electrical Characteristics

4.3.2.3

DDR3 Mode I/O DC Parameters

The DDR3 interface fully complies with JESD79-3D DDR3 JEDEC standard release April, 2008. The

parameters in Table 14 are guaranteed per the operating ranges in Table 7, unless otherwise noted.

Differential Input Logic High

Vih(diff)

0.26

See Note2

Differential Input Logic Low

Vil(diff)

See Note2

-0.26

Input current (no pull-up/down)

Iin

Vin = 0 V

Vin=OVDD

—

μA

Pull-up/Pull-down impedance Mismatch

-15

+15

240 Ohm unit calibration resolution

Ohm

Keeper Circuit Resistance

—

1403

—k

1 Note that the JEDEC LPDDR2 specification (JESD209_2B) supersedes any specification in this document.

2 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.

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

Ω to override this keeper.

Table 14. DDR3 I/O DC Electrical Parameters

Parameters

Symbol

Test Conditions

Min

Typ

Max

Unit

High-level output voltage

Voh

—

0.8*OVDD1

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

——

Low-level output voltage

Vol

—

0.2*OVDD

DC input Logic High

VIH(dc)

—

Vref2+0.1

2 Vref – DDR3 external reference voltage

—OVDD

DC input Logic Low

VIL(dc)

—

OVSS

—

Vref-0.1

Differential input Logic High

VIH(diff)

—

0.2

—

See Note3

Differential input Logic Low

VIL(diff)

—

See Note3

—-0.2

Over/undershoot peak

Vpeak

—

0.4

Over/undershoot area

(above OVDD or below OVSS)

Varea

—

0.67

V x

Termination Voltage

Vtt

Vtt tracking OVDD/2

0.49*OVDD

Vref

0.51*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

Table 13. LPDDR2 I/O DC Electrical Parameters1 (continued)

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