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DATA STROBE INDUCTOR FOR ELECTROSTATIC DISCHARGE INTERFERENCE ELIMINATION

IP.com Disclosure Number: IPCOM000026170D
Original Publication Date: 1990-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 68K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a xerographic printing device coupled to a computer terminal output port, the potential exists for the transfer of an electrostatic discharge spike from an operator to the computer terminal or surrounding equipment and furniture. Subsequently, this type of electrostatic discharge may become electromagnetically coupled to the communications cable passing between the computer terminal and the printing device. Furthermore, should the printing device utilize a data strobe line to enable synchronous data transmission, the electromagnetic voltage spike that is produced may cause the communications hardware to interpret the electromagnetic spike as a data strobe pulse. This would result in the communications controller of the printing device latching whatever data last remained on the parallel data line.

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XEROX DISCLOSURE JOURNAL

DATA STROBE INDUCTOR FOR ELECTROSTATIC DISCHARGE U.S. C1.375/099 INTERFERENCE ELIMINATION
John T. Buzzelli
Merrick E. Shaw

Proposed Classification

Int. C1. H03d 1/04

In a xerographic printing device coupled to a computer terminal output port, the potential exists for the transfer of an electrostatic discharge spike from an operator to the computer terminal or surrounding equipment and furniture. Subsequently, this type of electrostatic discharge may become electromagnetically coupled to the communications cable passing between the computer terminal and the printing device. Furthermore, should the printing device utilize a data strobe line to enable synchronous data transmission, the electromagnetic voltage spike that is produced may cause the communications hardware to interpret the electromagnetic spike as a data strobe pulse. This would result in the communications controller of the printing device latching whatever data last remained on the parallel data line.

The present invention utilizes an inductor, placed in series with the data strobe line to eliminate the electromagnetic spikes caused by propagation of the electrostatic discharge. Specifically, on a data strobe line nominally held at + 5Vdc with an active low (OVdc) strobe pulse, an 82 pH inductor was placed in series with the data strobe line and was effective in eliminating the electrostatic spike problem. Use of the inductor in this manner is particularly valuable for compute...