USBDF02W5

USBDFxxW5 EMI filter and line termination for USB downstream ports Applications EMI Filter and line termination for USB downstream ports on: ■ Desktop computer ■ Notebooks ■ Workstations ■ USB Hubs 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 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). Complies with the following standards IEC 61000-4-2, level 4 ±15 kV (air discharge) ±8 kV (contact discharge) MIL STD 883C, Method 3015-6 Class 3 C = 100 pF R = 1500 W 3 positive strikes and 3 negative strikes (F = 1 Hz) SOT323-5L Functional diagram D+ In Gnd D- In Rt Ct Rd Ct Rd Rt D+ Out D- Out USBDF01W5 USBDF02W5 Tolerance Rt 33 Ω 15 Ω ±10% Rd 15 kΩ 15 kΩ ±10% Ct 47 pF ...