EClamp2122S

EClamp2122S USB Downstream Port Filter & TVS For EMI Filtering and ESD Protection PROTECTION PRODUCTS - EMIClamp® Description The EClamp®2122S is combination EMI filter and line termination device with integrated TVS diodes for use on USB 2.0 interfaces. This device utilizes solid-state silicon-avalanche technology for superior clamping performance and DC electrical characteristics. They have been optimized for protection of USB interfaces in cellular phones and other portable electronics. USB line termination is achieved with a series 22Ω resistor on both the D+ and D- USB lines. These resistors preserve signal integrity by matching the cable impedance to that of the differential driver. The 15kΩ pull-down resistors complete the termination circuit on each line. They are required by the USB specification to identify the line as a downstream connection. The capacitors are used to bypass high frequency energy to ground and for edge rate control of the USB signals. Integrated TVS diodes provide ESD protection of both (D+ & D-) data lines and the voltage bus (VBUS). The TVS diodes provide effective suppression of ESD voltages in excess of 25kV (air discharge) and 20kV (contact discharge) per IEC 61000-4-2. The EClamp2122S is in a 6-pin SOT-23 package. The leads are finished with lead-free matte tin. It is suitable for use in USB hubs, computers, peripherals, and portable devices Features ‹ EMI/RFI filtering and line termination with integrated ESD protection ‹ ESD protection f...