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PSRDA15-4-T13 Datasheet(PDF) 4 Page - Protek Devices |
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PSRDA15-4-T13 Datasheet(HTML) 4 Page - Protek Devices |
4 / 5 page PSRDA3.3-4 thru PSRDA15-4 4 05096.R8 3/07 www.protekdevices.com APPLICATION NOTE The PSRDAxx-4 Series are low capacitance, unidirectional TVS arrays that are designed to protect I/O or high speed data lines from the damaging effects of ESD or EFT. This product series has a surge capability of 500 Watts P PP per line for an 8/20µs waveshape and offers ESD protection > 40kV. DIFFERENTIAL-MODE CONFIGURATION (Figure 1) Ideal for use in USB applications, the PSRDAxx-4 Series provides up to four (4) lines of protection in a differential-mode configuration as depicted in Figure 1. Circuit connectivity is as follows: ✔ Pins 1, 4, 6 and 7 are connected to the data lines. ✔ Pins 5 and 8 are connected to ground. ✔ Pins 2 and 3 are connected to the databus. DIFFERENTIAL-MODE CONFIGURATION (Figure 2) The PSRDAxx-4 Series also provides up to four (4) lines of protection in a differential-mode configuration as depicted in Figure 2 for T1/E1 applications. Circuit connectivity is as follows: ✔ Pins 1, 4, 6 and 7 are connected to the data lines. ✔ Pins 5 and 8 are connected to ground. ✔ Pins 2 and 3 are connected to the databus. CIRCUIT BOARD LAYOUT RECOMMENDATIONS Circuit board layout is critical for Electromagnetic Compat- ibility (EMC) protection. The following guidelines are recommended: ✔ The protection device should be placed near the input terminals or connectors, the device will divert the transient current immediately before it can be coupled into the nearby traces. ✔ The path length between the TVS device and the protected line should be minimized. ✔ All conductive loops including power and ground loops should be minimized. ✔ The transient current return path to ground should be kept as short as possible to reduce parasitic induc- tance. ✔ Ground planes should be used whenever possible. For multilayer PCBs, use ground vias. Figure 2. Typical Differential-Mode T1/E1 Protection 4 1 2 8 7 6 5 3 PTC PTC PTC PTC PLC01- 6 PLC01- 6 GND GND TRING TTIP RTIP RRING 4 1 2 8 7 6 5 3 Figure 1. Typical Differential-Mode USB Protection USB PORT V BUS GND D+ D- USB PORT V BUS GND D+ D- V BUS GND GND |
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