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 

APPLICATION INFORMATION

USBDFxxW5

Fig. A1: USB Standard requirements

Rt

D+

Full-speed or

Low-speed USB Ct

Transceiver

Rt

D-

Host or

Ct 15k 15k

Hub port

Twisted pair shielded

Zo = 90ohms

5m max

+Vbus

1.5k

D+

Rt

Rt

D-

Ct Full-speed USB

Transceiver

Ct Hub 0 or

Full-speed function

FULL SPEED CONNECTION

Rt

D+

Full-speed or

Low-speed USB Ct

Transceiver

Rt

D-

Host or

Ct 15k 15k

Hub port

Untwisted unshielded

3m max

+Vbus

1.5k

D+

Rt

Rt

D-

Ct Low-speed USB

Transceiver

Ct Hub 0 or

Low-speed function

LOW SPEED CONNECTION

APPLICATION EXAMPLE

Downstream port

Upstream port

Host/Hub USB

port transceiver

D+ (1)

D+ CABLE D- (2)

USBDF

xxW5

+Vbus

USBUF

xxW6

D-

D- (1)

D+ (2)

(1) for a low-speed port

(2) for a full-speed port

Peripheral

transceiver

3/9

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