USBDFXXW5(2000) 查看數據表（PDF） - STMicroelectronics

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USBDFXXW5
(Rev.:2000)

EMI FILTER AND LINE TERMINATION FOR USB DOWNSTREAM PORTS

STMicroelectronics 

USBDFxxW5

TRANSITION TIMES

This low pass filter has been designed in order to meet the USB 1.1 standard requirements that implies the

signal edges are maintained within the 4ns-20ns stipulated USB specification limits.

Fig. A12: Typical rise and fall times: measurements configuration

+5V

74HC04

+5V

Square

Pulse

Generator

D+

USBDF

xxW5

D-

+5V

74HC04

Fig. A13: Typical rise and fall times

a. Rise time

8/9

b. Fall time

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