USBDFXXW5 datasheet(1/11 Pages) STMICROELECTRONICS

tên linh kiện	USBDFXXW5

Giải thích chi tiết về linh kiện	EMI filter and line termination for USB downstream ports

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September 2006

Rev 3

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USBDFxxW5

EMI filter and line termination for USB downstream ports

Applications

EMI Filter and line termination for USB

downstream ports on:

■ Desktop computer

■ Notebooks

■ Workstations

■ USB Hubs

Features

■ Monolithic device with recommended line

termination for USB downstream ports

■ Integrated Rt series termination and Ct

bypassing capacitors.

■ Integrated ESD protection

■ Small package size

Description

The USB specification requires USB downstream

ports to be terminated with pull-down resistors

from the D+ and D- lines to ground. On the

implementation of USB systems, the radiated and

conducted EMI should be kept within the required

levels as stated by the FCC regulations. In

addition to the requirements of termination and

EMC compatibility, the computing devices are

required to be tested for ESD susceptibility.

The USBDFxxW5 provides the recommended line

termination while implementing a low pass filter to

limit EMI levels and providing ESD protection

which exceeds IEC 61000-4-2 level 4 standard.

The device is packaged in a SOT323-5L, which is

a very small (50% smaller than the standard

SOT23).

Complies with the following standards

Functional diagram

Order codes

Benefits

■ EMI / RFI noise suppression

■ Required line termination for USB downstream

ports

■ ESD protection exceeding

IEC61000-4-2 level 4

■ IPAD™ technology provides high flexibility in

the design of high density boards

■ Tailored to meet USB 1.1 standard

TM: IPAD is a trademark of STMicroelectronics

IEC 61000-4-2, level 4 ±15 kV (air discharge)

±8 kV (contact discharge)

MIL STD 883C, Method 3015-6

Class 3 C = 100 pF R = 1500 W

3 positive strikes and 3 negative strikes (F = 1 Hz)

Part number

Marking

USBDF01W5

UD1

USBDF02W5

UD2

SOT323-5L

D+ In

D- In

Gnd

D+ Out

D- Out

Rt

Rd

Ct

Rt

Ct

Rd

Rt

Rd

Ct

USBDF01W5

33

Ω

15 k

Ω

47 pF

USBDF02W5

15

Ω

15 k

Ω

47 pF

Tolerance

±10%

±20%

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Số phần tương tự - USBDFXXW5

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
STMicroelectronics	USBDFXXW5	103Kb / 9P	EMI FILTER AND LINE TERMINATION FOR USB DOWNSTREAM PORTS May-2000

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