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Dual-Level Printed Circuit Board Edge Connector

IP.com Disclosure Number: IPCOM000041103D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

McLean, JG: AUTHOR

Abstract

A technique is described whereby female printed circuit board connectors incorporate two levels of contacts, so as to eliminate the possibility of damaging of components connected to signal circuits. No change is made to the male printed circuit card connectors which plug into the board connectors.

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Dual-Level Printed Circuit Board Edge Connector

A technique is described whereby female printed circuit board connectors incorporate two levels of contacts, so as to eliminate the possibility of damaging of components connected to signal circuits. No change is made to the male printed circuit card connectors which plug into the board connectors.

In prior art, female printed circuit connector contacts were positioned on a single level plane and caused no component damage during circuit card replacement or circuit card switching, provided power supply voltage was turned off during the replace ment. However, circuit card switching often takes place with power remaining on the machine, called "Hot Card Switching". Although "Hot Card Switching" is not a recommended procedure, it is frequently performed during service or installation of features. During card switching with power on, a phenomenon called "latch-up" can occur within integrated circuit (IC) devices on the card. "Latch-up" is a potentially damaging condition which may be triggered when power supply voltages are not applied before signal voltages are applied. The technique described herein provides a dual-level of contacts in the female connector, so as to ensure that the power supply voltage and ground connections are applied to the components before the application of sensitive signal voltages. This ensures that "Latch-up" will not occur.

The female connector, as shown in Figs. 1 and 2, incorporates long c...