USB4604 datasheet(67/71 Pages) SMSC

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USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

SMSC USB4604

Revision 1.0 (06-17-13)

DATASHEET

9.6

Clock Specifications

The device can accept either a 24 MHz crystal or a 24 MHz single-ended clock oscillator input. If the

single-ended clock oscillator method is implemented, XTAL1 should be left unconnected and REFCLK

should be driven with a clock that adheres to the specifications outlined in Section 9.6.2, "External

Reference Clock (REFCLK)".

9.6.1

Oscillator/Crystal

It is recommended that a crystal utilizing matching parallel load capacitors be used for the crystal

input/output signals (XTAL1I/XTAL2). See Table 9.12 for the recommended crystal specifications.

Note 9.10 0oC for commercial version, -40oC for industrial version.

Note 9.11 +70oC for commercial version, +85oC for industrial version.

Table 9.11 SPI Timing Values (60 MHz Operation)

SYMBOL

DESCRIPTION

MIN

TYP

MAX

UNITS

tfc

Clock frequency

MHz

tceh

Chip enable (SPI_CE_EN) high time

tclq

Clock to input data

tdh

Input data hold time

tos

Output setup time

toh

Output hold time

tov

Clock to output valid

tcel

Chip enable (SPI_CE_EN) low to first clock

tceh

Last clock to chip enable (SPI_CE_EN) high

Table 9.12 Crystal Specifications

PARAMETER

SYMBOL

MIN

NOM

MAX

UNITS

NOTES

Crystal Cut

AT, typ

Crystal Oscillation Mode

Fundamental Mode

Crystal Calibration Mode

Parallel Resonant Mode

Frequency

Ffund

24.000

MHz

Total Allowable PPM Budget

+/-350

PPM

Operating Temperature Range

Note 9.10

Note 9.11

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