IMX53CEC datasheet(41/204 Pages) FREESCALE

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Electrical Characteristics

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

Freescale Semiconductor

4.5.2

LPDDR2 I/O AC Electrical Characteristics

The DDR2/LVDDR2 interface mode fully complies with JESD79-2E DDR2 JEDEC standard release

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

April, 2008.

Table 23 shows the AC parameters for LPDDR2 I/O operating in DDR2 mode.

Output Pad Transition Times (Low Drive)

tr, tf

15 pF

35 pF

——

4.82/4.5

10.54/9.95

Output Pad Slew Rate (Max Drive)1

tps

15 pF

35 pF

0.69/0.78

0.36/0.39

——

V/ns

Output Pad Slew Rate (High Drive)1

tps

15 pF

35 pF

0.55/0.62

0.28/0.30

——

V/ns

Output Pad Slew Rate (Medium Drive)1

tps

15 pF

35 pF

0.39/0.44

0.19/0.20

——

V/ns

Output Pad Slew Rate (Low Drive)1

tps

15 pF

35 pF

0.21/0.22

0.09/0.1

——

V/ns

Output Pad di/dt (Max Drive)

tdit

—

mA/ns

Output Pad di/dt (High Drive)

tdit

—

mA/ns

Output Pad di/dt (Medium drive)

tdit

—

mA/ns

Output Pad di/dt (Low drive)

tdit

—

mA/ns

Input Transition Times2

trm

—

1 tps is measured between VIL to VIH for rising edge and between VIH to VIL for falling edge.

2 Hysteresis mode is recommended for inputs with transition time greater than 25 ns.

Table 23. LPDDR2 I/O DDR2 mode AC Characteristics1

1 Note that the JEDEC SSTL_18 specification (JESD8-15a) for class II operation supersedes any specification in this

document.

Parameter

Symbol

Test Condition

Min

Typ

Max

Unit

AC input logic high

Vih(ac)

—

Vref+0.25

——

AC input logic low

Vil(ac)

——

—

Vref-0.25

AC differential input voltage2

Vid(ac)

—

0.5

—

OVDD

Input AC differential cross point voltage3

Vix(ac)

—

Vref – 0.175

—Vref + 0.175

Output AC differential cross point voltage4

Vox(ac)

—

Vref – 0.125

—Vref + 0.125

Single output slew rate

tsr

At 25

Ω to Vref

0.4

—

V/ns

Skew between pad rise/fall asymmetry +

skew caused by SSN

tSKD

clk=266Mhz

clk=400Mhz

——

0.2

0.1

Table 22. GPIO I/O AC Parameters Fast Mode (continued)

Parameter

Symbol

Test

Condition

Min

Typ

Max

Unit

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