USBUF01P6_10 Datasheet, PDF (1/9 Pages) STMicroelectronics – IPAD™ EMI filter and line termination for USB upstream ports

USBUF01P6
IPAD™ EMI filter and line termination for USB upstream ports
Features
■ Monolithic device with recommended line
termination for USB upstream ports
■ Integrated R_t series termination and C_t
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 2.0 standard (low speed
and full speed data transmission)
Complies with the following standards:
■ IEC 61000-4-2 level4:
– 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, 3 negative strikes
(F = 1 Hz)
Applications
EMI Filter and line termination for USB upstream
ports on:
■ USB Hubs
■ PC peripherals
SOT-666IP
Figure 1. Functional diagram (top view)
3.3 V
Rt
Rp
D1
D4
Ct
GND
3.3 V
Rt
D2
D3
Ct
Description
The USB specification requires upstream ports to
be terminated with pull-up resistors from the D+
and D- lines to V_bus. For 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 USBUF01P6 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 SOT-666, which is
the smallest available lead-frame package (45%
smaller than the standard SOT323).
TM: IPAD is a trademeark of STMicroelectronics
February 2010
Doc ID 9883 Rev 7
1/9
www.st.com
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