EMI滤波器和ESD保护顺流USB端口 EMI Filter & ESD Protection for Down Stream USB Ports
Key Features: Bi-directional EMI/RFI Low-Pass Filter Line Termination with Integrated ESD Protection Low TVS Operating Voltage 5.25V Low Leakage Current Integrated Single Die Construction Available With 15 or 22? Series Resistance Crosses from Semtech STF201 Description: The LX7201 is an integrated Universal Serial Bus USB line termination device with an EMI filter and ESD protection diodes. This device offers a cost effective and compact solution for one USB downstream port. The USB v1.1 specification requires line termination resistors on both the D+ and D- lines. These resistors ensure signal integrity by matching the cable impedance to that of the differential driver. The 15K? pull-down resistors identify the line as a downstream connection. The 47 pF capacitor completes the high frequency filter and controls the edge rate of the USB signals. The LX7201 protects both D+ and D- data lines and the voltage bus from ESD. The TVS protection diodes exceed the requirements of IEC61000-4-2, level 4, 15kV air discharge and 8kV contact discharge. The integrated configuration of the LX7201 minimizes board space and allows for ideal placement near the connector. The LX7201 is ideal for use in USB hubs, peripherals and portable appliances.