Electricity: electrical systems and devices – Discharging or preventing accumulation of electric charge
Patent
1992-09-28
1995-06-27
Pellinen, A. D.
Electricity: electrical systems and devices
Discharging or preventing accumulation of electric charge
361 56, 361118, 361220, H02H 322
Patent
active
054284988
ABSTRACT:
An electrostatic discharge protection device for a connector associated with an integrated circuit chip, particularly one associated with a thermal ink-jet printhead. A MOS field effect device extends along at least one edge of the connector on the chip. A bipolar transistor, parasitic to the field effect device, conducts current from the connector to ground in response to a voltage between the connector and ground in excess of a predetermined threshold. A zone of a predetermined electrical resistance is operatively disposed between the bipolar transistor and ground. The zone may substantially encircle the bonding pad of the connector to evenly distribute local incidences of high voltage. The invention enables integrated circuits to pass ESD requirements of office products, which is 15 kV by Human Body Model testing.
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Burke Cathie J.
Hawkins William G.
Tellier Thomas A.
Vandebroek Sophie
Watrobski Thomas E.
Fleming Fritz M.
Hutter R.
Pellinen A. D.
Xerox Corporation
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