USB251XB datasheet(45/57 Pages) MICROCHIP

部件名	USB251XB

功能描述	USB 2.0 Hi-Speed Hub Controller

PDF	57 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

标志

45 / 57 page

 2022 Microchip Technology Inc. and its subsidiaries

DS00001692D-page 45

USB251xB/xBi

7.2

External Clock

50% duty cycle

 10%, 24 MHz  350 ppm, jitter < 100 ps rms.

The external clock is recommended to conform to the signaling level designated in the JESD76-2 Specification [5] on

1.2 V CMOS Logic. XTALOUT should be treated as a weak (<1mA) buffer output.

7.2.1

SMBUS INTERFACE

The hub conforms to all voltage, power, and timing characteristics and specifications as set forth in the SMBus 1.0 Spec-

ification

[3] for slave-only devices (except as noted in Section 5.3, "SMBus," on page 33.

7.2.2

I2C EEPROM

Clock frequency is fixed at 60 kHz

 20

7.2.3

USB 2.0

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

2.0 Specification

[1].

USB251XB 数据表(PDF) 45 Page - Microchip Technology