February 2010

Doc ID 9883 Rev 7

1/9

9

USBUF01P6

IPAD™ EMI filter and line termination for USB upstream ports

Features

termination for USB upstream ports

bypassing capacitors.

Benefits

ports

IEC 61000-4-2 level 4

boards

and full speed data transmission)

Complies with the following standards:

– 15 kV (air discharge)

– 8 kV (contact discharge)

– 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:

Figure 1.

Functional diagram (top view)

Description

The USB specification requires upstream ports to

be terminated with pull-up resistors from the D+

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

SOT-666IP

3.3 V

Rp

Ct

Rt

Ct

Rt

D1

GND

D2

D4

D3

3.3 V

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