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SRV05-4 Datasheet(PDF) 4 Page - Socay Electornics Co., Ltd. |
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SRV05-4 Datasheet(HTML) 4 Page - Socay Electornics Co., Ltd. |
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4 / 7 page  Transient Voltage Suppressors Array for ESD Protection Low Capacitance Revision January 06, 2014 4 / 7 @ SOCAY Electronics Co., Ltd. 2014 Specifications are subject to change without notice. Please refer to www.socay.com for current information. SRV05-4 SOCAY Electronics Co., Ltd. www.socay.com Figure 1. Data Line and Power Supply Protection Using VCC as reference Figure 2. Data Line Protection with Bias and Power Supply Isolation Resistor Figure 3. Data Line Protection Using Internal TVS Diode as Reference Device Connection Options for Protection of Four High-Speed Data Lines The SRV05-4 is designed to protect four data lines from transient over-voltages by clamping them to a fixed reference. When the voltage on the protected line exceeds the reference voltage (plus diode VF) the steering diodes are forward biased, conducting the transient current away from the sensitive circuitry. Data lines are connected at pins 1, 3, 4 and 6. The negative reference (REF1) is connected at pin 2. This pin should be connected directly to a ground plane on the board for best results. The path length is kept as short as possible to minimize parasitic inductance. The positive reference (REF2) is connected at pin 5. The options for connecting the positive reference are as follows: 1. To protect data lines and the power line, connect pin 5 directly to the positive supply rail (VCC). In this configuration the data lines are referenced to the supply voltage. The internal TVS diode prevents over-voltage on the supply rail (See Figure1). 2. The SRV05-4 can be isolated from the power supply by adding a series resistor between pin 5 and VCC. A value of 100k Ω is recommended. The internal TVS and steering diodes remain biased, providing the advantage of lower capacitance (See Figure2). 3. In applications where no positive supply reference is available, or complete supply isolation is desired, the internal TVS may be used as the reference. In this case, pin 5 is not connected. The steering diodes will begin to conduct when the voltage on the protected line exceeds the working voltage of the TVS (plus one diode drop) (See Figure3). Applications Information |
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