Browse Prior Art Database

ESD Protective Serpentine Block Design

IP.com Disclosure Number: IPCOM000119768D
Original Publication Date: 1991-Feb-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Related People

Soohoo, KM: AUTHOR [+3]

Abstract

Disclosed is an electrostatic discharge (ESD) protective I/O serpentine block design. This design involves the modification of the current standardized I/O interface cable mating serpentine block design to add the capability of electrostatic charge bleeding of the signal inputs, during the initial cable plugging period, with the use of an I/O cable presence detector switch through a series resistor to ground. When an I/O cable is plugged into the I/O serpentine block, electrostatic discharge across the input signal pin(s) will be bled off through the ground within a very short period of time upon contact since the normally closed switch (cable presence detection) directs the ESD current to ground through a series resistor that serves both voltage dividing and current limiting functions.

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ESD Protective Serpentine Block Design

      Disclosed is an electrostatic discharge (ESD) protective I/O
serpentine block design.  This design involves the modification of
the current standardized I/O interface cable mating serpentine block
design to add the capability of electrostatic charge bleeding of the
signal inputs, during the initial cable plugging period, with the use
of an I/O cable presence detector switch through a series resistor to
ground.  When an I/O cable is plugged into the I/O serpentine block,
electrostatic discharge across the input signal pin(s) will be bled
off through the ground within a very short period of time upon
contact since the normally closed switch (cable presence detection)
directs the ESD current to ground through a series resistor that
serves both voltage dividing and current limiting functions.  When
the I/O cable connector finally transfers the I/O presence switch via
a spring-loaded plunger, or equivalent, the normal signal path is
then reconnected and broken off from the ESD bleed path.  The figure
is a diagram briefly depicting this new design.

      Disclosed anonymously.