IC FILTER USB ESD PROTECT 6TSOP

STF202-22T1G

Manufacturer Part NumberSTF202-22T1G
DescriptionIC FILTER USB ESD PROTECT 6TSOP
ManufacturerON Semiconductor
SeriesSTF202-22
STF202-22T1G datasheet
 


Specifications of STF202-22T1G

Resistance (ohms)22Capacitance68pF
Power (watts)0.2W, 1/5WPackage / CaseSC-74-6
Resistance In Ohms22.0Power Dissipation Pd225mW
Diode Case StyleTSOPNo. Of Pins6
Filter TerminalsSMDMounting TypeSurface Mount
Peak Reflow Compatible (260 C)YesLeaded Process CompatibleYes
Rohs CompliantYesLead Free Status / RoHS StatusLead free / RoHS Compliant
Tolerance-Other namesSTF202-22T1GOSTR
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What Is USB?
The USB is not a serial port, it is a serial bus, a fact that
enables a single port on the computer to be a link for a myriad
of devices, (up to 127 devices in a USB system). We can
easily chain one device to another and use one port as a
connecting point of many devices by using a hub. All these
enables us to look at the USB system as a small network of
devices.
SCANNER
PRINTER
Typically the USB system consists of one host, hubs and
devices.
The Host in the USB system, is responsible to the whole
complexity of the protocol (simplifies the designing of USB
devices). The host controls the media access, therefore, no
one can access the bus unless it got an approval required
from the host.
The Hub provides an interconnect point, which enables
many devices to connect to a single USB port. The logical
topology of the USB is a star structure, all the devices are
connected (logically) directly to the host. It is totally
transparent to the device what is its hub tier (the number of
hubs the data has to flow through). The hub is connected to
the USB host in the upstream direction (data flows “up” to
the host) and is connected to the USB device in the
downstream direction (data flows “down” from the host to
the device). The hub’s main functionality is the
responsibility of detecting an attachment and detachment of
devices, handling the power management for devices that
are bus−powered (get power from the bus), and
responsibility for bus error detection and recovery. Another
important role of the hub is to manage both full and low
speed devices. When a device is attached to the system the
hub detects the speed, which the device operates in, and
through the whole communication on the bus prevents from
full speed traffic to reach low speed device and vice versa −
prevent from low speed traffic to reach full speed device.
The Device is defined as everything in the USB system,
which is not a host (including hubs). A device provides one
APPLICATIONS BACKGROUND
The Universal Serial Bus (USB) makes connecting
devices to your computer faster, easier and virtually
limitless. High−Speed USB devices are capable of
communicating at speeds up to 12 megabits without shutting
down and without having to open your computer.
MONITOR
COMPUTER PC
HUB
CPU
KEYBOARD
Figure 5. Typical USB System
or more USB functions. Most of the devices provide only
one function but there may be some, which provides more
than one and called compound devices. We refer to two
kinds of devices − self powered or bus powered devices. A
device that gets its power from the bus is called bus powered
and on the other hand a device which supplies its own power
is called self powered. There are two kinds of devices:
Full−speed devices − operates in 12 Mb/s
Low−speed devices that work in 1.5 Mb/s
STF202 Device Information
The Universal Serial Bus (USB) specification revision 1.1
requires EMI Filtering and line termination for the USB I/O
lines. The STF202 device from ON Semiconductor
provides upstream termination, EMI Filtering and ESD
Protection to IEC6100−4−2 (Level 4) in an integrated
solution placed in a small and single package (TSOP−6,
Case 318G). The equivalent circuit of this device is shown
in the Figure 6.
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http://onsemi.com
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TELEPHONE
PLOTTER
MOUSE
R
S1
C
GROUND
C
R
S2
Figure 6.