STF203-15 Datasheet, PDF (1/6 Pages) Semtech Corporation – USB Upstream Port Filter and TVS

STF203-15 THRU STF203-33
USB Upstream Port Filter and TVS
For EMI Filtering and ESD Protection
PROTECTION PRODUCTS
Description
The STF203 is a combination EMI filter and line
termination device with integrated TVS diodes for use
on upstream USB ports. It is constructed using a
proprietary technology that allows passive components
and TVS diodes to be integrated in the same package.
Each device will provide termination, filtering, and ESD
protection for one upstream USB port. The STF203 is
an easily implemented solution for meeting the
requirements of revision 1.1 of the Universal Serial Bus
specification.
Line termination is achieved with series resistors on
both the D+ and D- USB lines. The value of series
resistance added to the output impedance of the USB
driver must be as close to possible to the 45Ω
characteristic impedance of the cable (90Ω balanced)
to minimize transmission line reflections. They are
available with resistor values of 15Ω (STF203-15),
22Ω (STF203-22), and 33Ω (STF203-33). The 1.5kΩ
pull-up resistor is required by the USB specification to
identify the equipment as either a full-speed
(connected to D+ line) or low-speed (connected to D-
line) device. The 47pF capacitors are required to
bypass high frequency energy to ground and to control
the edge rate of the USB signals. The TVS diodes
provide ESD protection of both (D+ and D-) data lines
and the voltage bus (V ). The TVS diodes on the
BUS
input/output pins provide suppression of ESD voltages
in excess of ±15kV (air discharge) and ±8kV (contact
discharge) per IEC 61000-4-2, level 4. The TVS diode
on the V pin will suppress ESD discharges in excess
BUS
of 25kV per IEC 61000-4-2.
Features
‹ Bidirectional EMI/RFI filtering and line termination
with integrated ESD protection
‹ ESD protection for USB power (V_BUS) and data lines
(D+ and D-) to
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
‹ Filtering and termination for one USB port
‹ Series resistors: 15Ω, 22Ω, and 33Ω
‹ Low TVS operating voltage (5.25V)
‹ Low leakage current
‹ Small SC70-6L package
‹ Solid-state technology
Mechanical Characteristics
‹ EIAJ SC70-6L package
‹ RoHS/WEEE Compliant
‹ Molding compound flammability rating: UL 94V-0
‹ Marking : Marking Code
‹ Packaging : Tape and Reel per EIA 481
Applications
‹ USB Ports
‹ Cellular Handsets
‹ PDAs
‹ Pagers
‹ Digital Cameras
‹ PC Peripherals
‹ MP3 Players
Circuit Diagram
Schematic and PIN Configuration
6
1
D In/Out
D In/Out
.
2
5
4
3
D In/Out
D In/Out
Revision 03/22/2006
SC70-6L (Top View)
1
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