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Description

The USB specification requires USB downstream ports to be terminated with pull-down resistors from the D+ and D- lines to ground. 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 USBDFxxW5 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 SOT323-5L, which is a very small (50 smaller than the standard SOT23).

Features

■ Monolithic device with recommended line

termination for USB downstream ports

■ Integrated Rt series termination and Ct

bypassing capacitors.

■ Integrated ESD protection

■ Small package size

Applications

EMI Filter and line termination for USB downstream ports on:

■ Desktop computer

■ Notebooks

■ Workstations

■ USB Hubs

Benefits

■ EMI / RFI noise suppression

■ Required line termination for USB downstream ports

■ ESD protection exceeding

IEC61000-4-2 level 4

■ IPAD? technology provides high flexibility in

the design of high density boards

■ Tailored to meet USB 1.1 standard