USB3813 datasheet(65/68 Pages) SMSC

65 / 68 page

USB 2.0 Hi-Speed 3-Port Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3813

Revision 1.0 (06-17-13)

DATASHEET

9.6

Clock Specifications

The device can accept a 24 MHz single-ended clock oscillator input. REFCLK should be driven with a

clock that adheres to the specifications outlined in Section 9.6.1, "External Reference Clock

(REFCLK)".

9.6.1

External Reference Clock (REFCLK)

The following input clock specifications are suggested:



50% duty cycle

± 10%



± 350 PPM

The input frequency of REFCLK is user configurable. Refer to Section 8.4, "Reference Clock" for

additional information on configuring a reference clock input.

Note: The external clock is recommended to conform to the signalling levels designated in the

JEDEC specification on 1.2V CMOS Logic.

Table 9.8 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

USB3813 数据表(PDF) 65 Page - SMSC Corporation

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