This is information on a product in full production.
August 2015 DocID7041 Rev 8 1/13
USBUF
EMI filter and line termination for USB upstream ports
Datasheet
-
production data
Figure 1. Functional diagram
Features
• Monolithic device with recommended line
termination for USB upstream ports
• Integrated Rt series termination and Ct
bypassing capacitors.
• Integrated ESD protection
• Small package size
• Benefits
– EMI / RFI noise suppression
– Required line termination for USB
upstream ports
– ESD protection exceeding IEC 61000-4-2
level 4
– High flexibility in the design of high density
boards
– Tailored to meet USB 1.1 standard
• Complies with the following standards IEC
61000-4-2, level 4
– ± 15 kV (air discharge)
– ± 8 kV (contact discharge)
– MIL STD 883E, Method 3015-7
– Class 3 C = 100 pF; R = 1500 Ω
– 3 positive strikes and 3 negative strikes
(F = 1 Hz)
Application
EMI Filter and line termination for USB upstream
ports on:
• USB Hubs
• PC peripherals
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 USBUF 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 SOT323-6L which is
the smallest available lead frame package (50%
smaller than the standard SOT23).
3.3 V
Rp
Ct
Rt
Ct
Rt
D1
Grd
D2
D4
D3
3.3 V
Table 1. Device summary
Order codes Marking
USBUF01W6 UU1
USBUF02W6 UU2
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