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USBDFXXW5 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. USBDFXXW5
Description  EMI FILTER AND LINE TERMINATION FOR USB DOWNSTREAM PORTS
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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USBDFXXW5 Datasheet(HTML) 1 Page - STMicroelectronics

   
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USBDFxxW5
®
EMI FILTER AND LINE TERMINATION
FOR USB DOWNSTREAM PORTS
May 2000 Ed : 1C
A.S.D.
SOT323-5L
FUNCTIONAL DIAGRAM
TM: ASD and TRANSIL are a trademarks of STMicroelectronics.
EMI Filter and line termination for USB down-
stream ports on:
- Desktop computer
- Notebooks
- Workstations
- USB Hubs
APPLICATIONS
n
Monolithic device with recommended line termi-
nation for USB downstream ports
n
Integrated Rt series termination and Ct bypass-
ing capacitors.
n
Integrated ESD protection
n
Small package size
FEATURES
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
the smallest available lead frame package (50%
smaller than the standard SOT23).
DESCRIPTION
n
EMI / RFI noise suppression
n
Required line termination for USB downstream
ports
n
ESD protection exceeding IEC61000-4-2 level 4
n
High flexibility in the design of high density
boards
n
Tailored to meet USB 1.1 standard
BENEFITS
D+ In
D- In
Gnd
D+ Out
D- Out
Rt
Rd
Ct
Rt
Ct
Rd
Rt
Rd
Ct
Code 01
33
15k
47pF
Code 02
15
15k
47pF
Tolerance
±10%
±10%
±20%


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