SGS Thomson Microelectronics USBUF01W6 Datasheet

®

EMI FILTER AND LINE TERMINATION

A.S.D.

APPLICATIONS

EMI Filter and line termination for USB upstream
ports on:

- USB Hubs

- PC peripherals

FEATURES

Monolithic device with recommended line termi-

■

nation for USB upstream ports
Integrated Rt series termination and Ct bypass-

■

ing capacitors.
Integrated ESD protection

■

Small package size

■

DESCRIPTION

The USBspecificationrequiresupstreamports
to be terminated withpull-up resistors from the
D+ and D- lines to Vbus. 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
computingdevicesare required to betestedfor
ESD susceptibility.

The USBUFxxW6 provides therecommended line
termination while implementing a low pass filter to
limit EMI levels and providing ESD protection
which exceeds IEC61000-4-2 level 4 standard.
The device is packaged in a SOT323-6L which is
the smallest available lead frame package (50%
smaller than the standard SOT23).

BENEFITS

■

EMI / RFI noise suppression

■

Required line termination for USB upstream
ports

■

ESDprotectionexceeding IEC61000-4-2 level4

■

High flexibility in the design of high density
boards

■

Tailored to meet USB 1.1 standard

USBUFxxW6

FOR USB UPSTREAM PORTS

SOT323-6L

FUNCTIONAL DIAGRAM

3.3V

Rt

D1

Ct

Grd

Rt

D2

Ct

Rt Rp Ct
CODE 01 33Ω 1.5kΩ 47pF
CODE 02 22Ω 1.5kΩ 47pF

Rp

D4

3.3V

D3

TM: ASDandTRANSIL are a trademarks of STMicroelectronics.

March 2002 - Ed: 3A

Tolerance ±10% ±10% ±20%

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USBUFxxW6

COMPLIES WITH THE FOLLOWING ESD
STANDARDS:

IEC61000-4-2, level 4

±15 kV (air discharge)
±8 kV (contact discharge)

MIL STD 883E, Method 3015-7
Class 3 C = 100 pF R= 1500 Ω
3positivestrikes and 3negative strikes (F=1Hz)

ABSOLUTE RATINGS (T

amb

= 25°C)

Symbol Parameter Value Unit

V

PP

ESD discharge IEC 61000-4-2, air discharge
ESD discharge IEC 61000-4-2, contact discharge
ESD discharge - MIL STD 883E - Method 3015-7

T

j

T

stg

T

L

T

op

P

r

Maximum junction temperature
Storage temperature range
Lead solder temperature (10 second duration)
Operating temperature range
Power rating per resistor

±16

±9

±25
150 °C

- 55 to +150 °C
260 °C

0to70 °C

100 mW

TECHNICAL INFORMATION
Fig. A1: USB Standard requirements

3.3V

1.5k

Full-speed or
Low-speed USB
Transceiver

Host or
Hub port

Rt

Ct

Rt

15k

Ct

15k

D+

Twisted pair shielded

D-

Zo = 90ohms

5m max

D+

D-

Rt

Full-speed USB

Ct

Rt

Transceiver

Ct

Hub 0 or
Full-speed function

kV
kV
kV

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Full-speed or
Low-speed USB
Transceiver

Host or
Hub port

FULL SPEED CONNECTION

3.3V

1.5k

Rt

Ct

Rt

15k

Ct

15k

D+

Untwisted unshielded

D-

LOW SPEED CONNECTION

3m max

D+

D-

Rt

Low-speed USB

Ct

Rt

Transceiver

Ct

Hub 0 or
Low-speed function

APPLICATION EXAMPLE
Fig. A2: Implementation of ST' solutions for USB ports

USBUFxxW6

Downstream port

D+

Gnd

D-

Host/Hub USB por transceivert

Downstream port

D+

Gnd

D-

Host/Hub USB por transceivert

D+ in

Gnd

D- in

D+ in

Gnd

D- in

USBDF01W5

Rt

Ct

Rd

Rd

Ct

Rt

USBDF01W5

Rt

Ct

Rd

Rd

Ct

Rt

CABLE

D+ out

D- out

D+

D+

D-

D-

FULL SPEED CONNECTION

CABLE

D+ out

D- out

D+

D+

D-

D-

USBUF01W6

D2

Ct

Rt

D3

USBUF01W6

D2

Ct

Rt

D3

Gnd

3.3V

Gnd

3.3V

Upstream port

D1

Ct

Rt

3.3V

Rp

D4

D1

Ct

Rt

3.3V

Rp

D4

D+

Peripheral transceiver

D-

Upstream port

D+

Peripheral transceiver

D-

LOW SPEED CONNECTION

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