SRV05-4 データシートの表示（PDF） - UN Semiconducctor INC
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SRV05-4 Datasheet PDF : 7 Pages
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Transient Voltage Suppressors Array for ESD Protection
SRV05-4
Low Capacitance
Applications Information
Figure 1. Data Line and Power Supply Protection
Using VCC as reference
Figure 2. Data Line Protection with Bias and Power
Supply Isolation Resistor
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 100kΩ is recommended. The internal
TVS and steering diodes remain biased, providing the
advantage of lower capacitance (See Figure2).
Figure 3. Data Line Protection Using Internal TVS
Diode as Reference
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).
UN Semiconductor Co., Ltd.
Revision January 06, 2014
4/7
www.unsemi.com.tw
@ UN Semiconductor Co., Ltd. 2014
Specifications are subject to change without notice.
Please refer to www.unsemi.com.tw for current information.
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