CYUSB2014-BZXI datasheet(19/82 Pages) INFINEON

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Datasheet

001-52136 Rev. *Y

2022-08-11

EZ-USB FX3

SuperSpeed USB Controller

Clocking

FX3 allows either a crystal to be connected between the XTALIN and XTALOUT pins or an external clock to be

connected at the CLKIN pin. The XTALIN, XTALOUT, CLKIN, and CLKIN_32 pins can be left unconnected if they are

not used.

Crystal frequency supported is 19.2 MHz, while the external clock frequencies supported are 19.2, 26, 38.4, and

52 MHz.

FX3 has an on-chip oscillator circuit that uses an external 19.2-MHz (±100 ppm) crystal (when the crystal option

is used). An appropriate load capacitance is required with a crystal. Refer to the specification of the crystal used

to determine the appropriate load capacitance. The FSLC[2:0] pins must be configured appropriately to select

the crystal- or clock-frequency option. The configuration options are shown in Table 3.

Clock inputs to FX3 must meet the phase noise and jitter requirements specified in Table 4.

The input clock frequency is independent of the clock and data rate of the FX3 core or any of the device interfaces.

The internal PLL applies the appropriate clock multiply option depending on the input frequency.

Table 3

Crystal/clock frequency selection

FSLC[2]

FSLC[1]

FSLC[0]

Crystal/clock frequency

19.2-MHz crystal

19.2-MHz input CLK

26-MHz input CLK

38.4-MHz input CLK

52-MHz input CLK

Table 4

FX3 input clock specifications

Parameter

Description

Specification

Units

Min

Max

Phase noise

100-Hz offset

–

–75

1-kHz offset

–

–104

10-kHz offset

–

–120

100-kHz offset

–

–128

1-MHz offset

–

–130

Maximum frequency

deviation

–

150

ppm

Duty cycle

–

Overshoot

–

Undershoot

–

–3

Rise time/fall time

–

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