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USBUF Datasheet

  • USBUF

  • EMI FILTER AND LINE TERMINATION FOR USB UPSTREAM PORTS

  • 9頁

  • ETC

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USBUFxxW6
EMI FILTER AND LINE TERMINATION
FOR USB UPSTREAM PORTS
A.S.D.鈩?/div>
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
s
s
s
s
SOT323-6L
DESCRIPTION
The USB specification requires upstream ports
to be terminated with pull-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
computing devices are required to be tested for
ESD susceptibility.
The USBUFxxW6 provides the recommended 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
s
s
FUNCTIONAL DIAGRAM
3.3 V
Rt
D1
Ct
Rp
D4
Grd
3.3 V
Rt
D2
Ct
D3
s
s
s
EMI / RFI noise suppression
Required line termination for USB upstream
ports
ESD protection exceeding IEC61000-4-2 level 4
High flexibility in the design of high density
boards
Tailored to meet USB 1.1 standard
Rt
CODE 01
CODE 02
Tolerance
33鈩?/div>
22鈩?/div>
鹵10%
Rp
1.5k鈩?/div>
1.5k鈩?/div>
鹵10%
Ct
47pF
47pF
鹵20%
TM: ASD and TRANSIL are a trademarks of STMicroelectronics.
March 2002 - Ed: 3A
1/9

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