Gate-coupled eprom cell for printhead

H - Electricity – 01 – L

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H01L 21/28 (2006.01) B41J 2/05 (2006.01) G11C 16/04 (2006.01)

Patent

CA 2641471

An EPROM cell (270) in a printhead control circuit for an inkjet printer, having exactly one polysilicon layer (256) and a conductive layer (260) disposed above the polysilicon layer, includes a control transistor (272) and an EPROM transistor (274). The control and EPROM transistors each have floating gates (280, 282) comprising a portion of the polysilicon layer (256), and an electrical interconnection, comprising a portion of the conductive layer (260), interconnects the floating gate (280) of the control transistor (272) and the floating gate (282) of the EPROM transistor (274).

L'invention concerne un boîtier EPROM (270) d'un circuit de commande de tête d'impression destiné à une imprimante à jet d'encre. Ce boîtier EPROM (270) comprend exactement une couche de polysilicium (256) et une couche conductrice (270) disposée au dessus de la couche de polysilicium. Ce boîtier (270) comprend un transistor de commande (272) et un transistor EPROM (274). Le transistor de commande et le transistor EPROM présentent chacun des grilles flottantes (280, 282) comprenant une partie de la couche de polysilicium (256), et une interconnexion électrique comprenant une partie de la couche conductrice (260), et se trouve en interconnexion avec la grille flottante (280) du transistor de commande (272) et avec la grille flottante (282) du transistor EPROM (274).

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