Semiconductor integrated circuit device
View Patent ↗A nonvolatile storage element of a single-layer gate type structure is arranged so that a floating gate is formed of a conductive layer which partly overlaps with a control gate, formed of a diffused layer, and is provided with a barrier layer covering a part of or the whole surface of the floating gate. Nonvolatile storage elements characterized as such are used for redundancy control of defects or change of functions.
1. A method of trimming a semiconductor integrated circuit device including an analog circuit, a nonvolatile storage element and a trimming circuit for trimming said analog circuit, comprising:
a first trimming step including storing, in said nonvolatile storage element, a first trimming data of said analog circuit of said semiconductor integrated circuit device formed on a semiconductor wafer;
a step of encapsulating said semiconductor integrated circuit device in a package; and
after said encapsulating step, a second trimming step including storing, in said nonvolatile storage element, a second, different trimming data for performing fine trimming of said analog circuit,
wherein, in said second trimming step, said storing of said second trimming data in said nonvolatile storage element is electrically performed.
2. A method of trimming a semiconductor integrated circuit device according to claim 1 ,
wherein, in said second trimming step, said second trimming data is electrically stored in said nonvolatile storage element by applying a voltage to an external terminal of said semiconductor integrated circuit device, which is encapsulated in said package, for changing states of said nonvolatile storage element.
3. A method of trimming a semiconductor integrated circuit device according to claim 1 ,
wherein said nonvolatile storage element includes a control gate electrode and a floating gate electrode which are overlapped with each other through an intervening insulating film.
4. A method of trimming a semiconductor integrated circuit device according to claim 1 ,
wherein said first trimming data includes upper bits of a trimming data, and
wherein said second trimming data includes, lower bits of said trimming data.
5. A semiconductor integrated circuit device comprising:
an analog circuit formed on a semiconductor substrate;
a nonvolatile storage element formed on said semiconductor substrate; and
a trimming circuit, formed on a semiconductor substrate, for trimming said analog circuit,
wherein said semiconductor integrated circuit device is encapsulated in a package,
said trimming circuit having a first trimming data, determined in said semiconductor integrated circuit device before said semiconductor integrated circuit device is encapsulated, for trimming said analog circuit and a second, different trimming data, determined after encapsulating said semiconductor integrated circuit device in said package, for performing a fine trimming of said analog circuit,
said trimming circuit includes a nonvolatile storage element for storing said first trimming data and said second trimming data,
wherein said second trimming data is electrically stored in said nonvolatile storage element by applying a voltage to an external terminal of said semiconductor integrated circuit device for changing states of said nonvolatile storage element.
6. A semiconductor integrated circuit device according to claim 5 , wherein said nonvolatile storage element includes a control gate electrode and a floating gate electrode which are overlapped with each other through an intervening insulating film.
7. A semiconductor integrated circuit device according to claim 5 ,
wherein said first trimming data includes upper bits of a trimming data, and
wherein said second trimming data includes lower bits of said trimming data.