Patent ID: 6803283
Filing Date: 2004-10-12
Classification: H01L

Abstract:
A method to form ROM devices in the manufacture of an integrated circuit device comprising:providing a semiconductor substrate; forming MOS gates overlying said substrate wherein said MOS gates comprise Flash gates each comprising a floating gate and a control gate; implanting ions into said substrate to form lightly doped drains for said MOS gates wherein a masking layer is used to offset said lightly doped drains from selected said MOS gates to thereby form constant-OFF MOS gates; thereafter forming spacers on sidewalls of said MOS gates; and thereafter implanting ions into said substrate to form source and drain regions for said MOS gates to thereby complete said ROM devices in the manufacture of said integrated circuit device wherein a second masking layer is used to offset said sources and drains from selective said spacers on said constant-OFF MOS gates and wherein said second masking layer is patterned using the same mask as used for said masking layer.