UM8511 Datasheet, PDF (5/7 Pages) Union Semiconductor, Inc. – 8 Line ESD/EMI Protections for Color LCD Interfaces

UM8511
Device Connection
The UM8511 is comprised of eight identical circuits each consisting of a low pass filter for EMI
suppression and dual TVS diodes for ESD protection. The device is in a 16-pin DFN package.
Electrical connection is made to the 16 pins located at the bottom of the device. A center tab serves as
the ground connection. The device has a flow through design for easy layout. All path lengths should
be kept as short as possible to minimize the effects of parasitic inductance in the board traces.
Ground Connection Recommendation
Parasitic inductance (L) present in the board layout will affect the filtering performance of the device.
As frequency (f) increases, the effect of the inductance becomes more dominant. This effect is given
by Equation 1.
Pin
Identification
1-8
Input Lines
9 - 16
Output Lines
Center Tab
Ground
Equation 1: The Impedance of an Inductor at
Frequency XLF
XLF(L, f ) = 2×л×f ×L
Where:
L= parasitic inductance in the PCB (H)
f = Frequency (Hz)
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