TESDS5V0ALC Datasheet, PDF (3/4 Pages) Taiwan Semiconductor Company, Ltd – Steering Diode Structure ESD Protection Array

Small Signal Diode
TESDS5V0ALC
Steering Diode Structure ESD Protection Array
Applications Information
—Designed to protect protect high speed data interfaces
—Designed to protect four data lines from transient over-voltages by clamping them to a fixed reference
—Designed to protect protect sensitive components which are connected to data and transmission lines from overvoltage caused by
electrostatic discharge (ESD), electrical fast transients (EFT), and lightning.
—TESDS5V0ALC incorporates eight surge rated, low capacitance steering diodes and a TVS diode in a single package
—During transient conditions, the steering diodes direct the transient to either the positive side of the power supply line or to ground
—The internal TVS diode prevents over-voltage on the power line, protecting any downstream components
Circuit Board Layout Recommendations
—To protect data lines and the power line, connect pin 5 directly to the VDD. In this configuration the data lines are referenced to
the supply voltage. The internal TVS diode prevents over-voltage on the supply rail.
—The TESDS5V0ALC can be isolated from the power supply by adding a series resistor between pin 5 and VDD. A value of 100kΩ is
recommended. The internal TVS and steering diodes remain biased, providing the advantage of lower capacitance.
²In 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
I/O#1
I/O#2
To
Protected
Device
I/O#1
I/O#2
VDD
To
Protected
Device
100K Ω
VDD
I/O#3
I/O#4
To
Protected
Device
I/O#3
I/O#4
—Data Line and Power Supply Protection Using Vcc as reference
To
Protected
Device
—Data Line Protection with Bias and Power Supply Isolation
I/O#1
I/O#2
To
Protected
Device
I/O#3
I/O#4
To
Protected
Device
—Data Line Protection Using Internal TVS Diode as Reference
Version : B11