Patent ID: 9276004
Filing Date: 2016-03-01
CPC Classification: H01L

Claim Text:
1. An integrated circuit (IC) comprising: a first memory cell transistor of a read only memory (ROM) array, said first memory cell transistor comprising a first metal gate including a first metal segment of a first work function, said first memory cell transistor having a first threshold voltage; a second memory cell transistor of said ROM array, said second memory cell transistor comprising a second metal gate including a second metal segment of a second work function, said second memory cell transistor having a second threshold voltage, wherein the second threshold voltage is greater than the first threshold voltage; a first logic transistor, said first logic transistor having a third metal gate including a third metal segment of said first work function, said first logic transistor having a third threshold voltage; and an overlying gate segment is situated over the first metal gate of the first memory cell transistor and the third metal gate of the first logic transistor.