USB2517 datasheet(51/58 Pages) MICROCHIP

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 2013-2016 Microchip Technology Inc.

DS00001598B-page 51

USB2517/USB2517I

9.0

AC SPECIFICATIONS

9.1

Oscillator/Clock

Crystal: Parallel Resonant, Fundamental Mode, 24 MHz

350ppm.

External Clock: 50% Duty cycle

 10%, 24 MHz  350ppm

9.1.1

SMBUS INTERFACE

The MCHP Hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the SMBus

1.0 Specification for Slave-Only devices (except as noted in Section 7.3, "SMBus Slave Interface").

9.1.2

I2C EEPROM

Frequency is fixed at 58.6KHz

20

9.1.3

USB 2.0

The MCHP Hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the USB 2.0

Specification. Please refer to the USB 2.0 Specification for more information.

FIGURE 9-1:

TYPICAL CRYSTAL CIRCUIT

Note:

CB equals total board/trace capacitance.

FIGURE 9-2:

FORMULA TO FIND VALUE OF C1 AND C2

XT A L 1

(C S1 =

C B + C XTA L )

XT A L 2

(C S2 =

C B + C XTA L )

C 1

C 2

C L

1M e g

Cry s ta l

(C1 + CS1) x (C2 + CS2)

(C1 + CS1 + C2 + CS2)

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