SLVS729B February 2008 – March 2016 2016 TPD4E004
Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
TPD4E004 is a diode array type TVS which is typically used to provide a path to ground for dissipating ESD events on hi-speed signal lines between a human interface connector and a system. As the current from ESD passes through the TVS, only a small voltage drop is present across the diode. This is the voltage presented to the protected IC. The low RDYN of the triggered TVS holds this voltage, VCLAMP, to a tolerable level for the protected IC.
For this design example, a single TPD4E004 is used to protect all the pins of two USB2.0 connectors. Table 1 lists the design parameters for the USB application.
|Signal range on IO1, IO2, IO3, and IO4||0 V to 3.6 V|
|Signal voltage range on VCC||0 V to 5.5 V|
|Operating Frequency||240 MHz|
When placed near the USB connectors, the TPD4E004 ESD solution offers little or no signal distortion during normal operation due to low IO capacitance and ultra-low leakage current specifications. The TPD4E004 ensures that the core circuitry is protected and the system is functioning properly in the event of an ESD strike. For proper operation, see the the following layout and design guidelines should be followed:
Figure 6 is a capture of the voltage clamping waveform of TPD4E004 during an +8kV Contact IEC 61000-4-2 ESD strike.