USBDFXXW5 데이터 시트보기 (PDF) - STMicroelectronics

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USBDFXXW5

EMI filter and line termination for USB downstream ports

STMicroelectronics 

Application information

USBDFxxW5

2.5

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 4 ns-20 ns stipulated USB

specification limits.

Figure 13. Typical rise and fall times: measurements configuration

Square

Pulse

Generator

+5V

74HC04

D+

+5V

D-

+5V

74HC04

USBDF

xxW5

Figure 14. Typical rise and fall times

A. Rise time

B. Fall time

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