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USBUFXXW6 Datasheet(PDF) 4 Page - STMicroelectronics |
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USBUFXXW6 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 11 page Technical information USBUFxxW6 4/11 USB connectors. Distance between the USB controller and the USB connector must be minimized. The 47 pF (Ct) capacitors are used to bypass high frequency energy to ground and for edge control, and are placed between the driver chip and the series termination resistors (Rt). Both Ct and Rt should be placed as close to the driver chip as is practicable. The USBUFxxW6 ensures a filtering protection against ElectroMagnetic and RadioFrequency Interferences thanks to its low-pass filter structure. This filter is characterized by the following parameters: ● cut-off frequency ● Insertion loss ● high frequency rejection. 2.3 ESD PROTECTION In addition to the requirements of termination and EMC compatibility, computing devices are required to be tested for ESD susceptibility. This test is described in the IEC 61000-4-2 and is already in place in Europe. This test requires that a device tolerates ESD events and remains operational without user intervention. The USBUFxxW6 is particularly optimized to perform ESD protection. ESD protection is based on the use of device which clamps at: Vcl = VBR + Rd .IPP This protection function is splitted in 2 stages. As shown in figure 6, the ESD strikes are clamped by the first stage S1 and then its remaining overvoltage is applied to the second stage through the resistor Rt. Such a configuration makes the output voltage very low at the output. Figure 4. USBUFxxW6 typical attenuation Figure 5. Measurement configuration 1 10 100 1,000 -30 -20 -10 0 Frequency (MHz) S21 (dB) TEST BOARD 50 Ω Vg 50 Ω |
Similar Part No. - USBUFXXW6_06 |
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Similar Description - USBUFXXW6_06 |
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