IMX53CEC datasheet(145/204 Pages) FREESCALE

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Electrical Characteristics

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

Freescale Semiconductor

145

4.7.19.2

USB PHY Additional Electrical Parameters

Table 103 lists the parameters for additional electrical characteristics for USB PHY.

4.7.19.3

USB PHY System Clocking (SYSCLK)

Table 104 lists the USB PHY system clocking parameters.

Table 102. USB PHY AC Timing Parameters

Parameter

Conditions

Min

Typ

Max

Unit

trise

1.5 Mbps

12 Mbps

480 Mbps

0.5

—300

tfall

1.5 Mbps

12 Mbps

480 Mbps

0.5

—300

Jitter

1.5 Mbps

12 Mbps

480 Mbps

——

0.2

Table 103. Additional Electrical Characteristics for USB PHY

Parameter

Conditions

Min

Typ

Max

Unit

Vcm DC

(dc level measured at receiver connector)

HS Mode

LS/FS Mode

–0.05

0.8

—0.5

2.5

Crossover Voltage

LS Mode

FS Mode

1.3

—2

Power supply ripple noise

(analog 3.3 V)

<160 MHz

–50

Power supply ripple noise

(analog 2.5 V)

<1.2 MHz

>1.2 MHz

–10

–50

Power supply ripple noise

(Digital 1.2 V)

All conditions

–50

Table 104. USB PHY System Clocking Parameters

Parameter

Conditions

Min

Typ

Max

Unit

Clock deviation

Reference Clock

frequency 24 MHz

–150

—

150

ppm

Rise/fall time

—

200

Jitter (peak-peak)

< 1.2 MHz

—

Jitter (peak-peak)

> 1.2 MHz

—

100

Duty-cycle

Reference Clock

frequency 24 MHz

—

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