USB5537B datasheet(68/79 Pages) MICROCHIP

68 / 79 page

USB5537B

DS00001682C-page 68

 2012 - 2015 Microchip Technology Inc.

7.2

External Clock

50% duty cycle

 10%, 25 MHz  30 ppm, jitter < 100 ps rms.

7.2.1

SMBUS CLOCK

The maximum frequency allowed on the SMBus clock line is 100 kHz.

7.2.2

USB 2.0

bit The Microchip hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the

USB 2.0 Specification 1.

7.3

SPI Timing

Note:

The external clock is based upon 1.2 V CMOS Logic. XTALOUT should be treated as a no connect when

an external clock is supplied.

FIGURE 7-3:

SPI TIMING

TABLE 7-2:

SPI TIMING OPERATION

Name

Parameter

MIN

MAX

Unit

TFC

Clock Frequency

MHz

TCEH

Chip Enable High Time

TCLQ

Clock to Input Data

TDH

Input Data Hold Time

TOS

Output Set up Time

TOH

Output Hold Time

TOV

Clock to Output Valid

SPI_CEN

SPI_CLK

SPI_DI

SPI_DO

TDH

Input Data

Valid

TCLQ

Output Data

Valid

TOV

TOH

Output Data

Valid

TOS

TOH

TFC

TCEH

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