Semiconductor memory device including a flash memory cell...

Details Semiconductor memory device including a flash memory cell... Semiconductor memory device including a flash memory cell...

2007-06-12

2007-06-12

Vu, David (Department: 2818)

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Having insulated electrode

C365S230030

Reexamination Certificate

active

10875720

ABSTRACT:
A semiconductor memory device included in a system-on-chip (SOC) or a microcomputer chip. The semiconductor memory device may include a flash memory cell array unit and a mask read-only memory (ROM) cell array unit which are formed in a single memory block without an isolation layer for separating the two units. Transistors included in the flash memory unit and the mask ROM unit are the same type and may have two threshold voltages. The transistor in each memory cell unit may be a split gate transistor, a metal-oxide-nitride-oxide-silicon, or silicon-oxide-nitride-oxide-silicon transistor. Further, the transistor included in the mask ROM unit in the semiconductor memory device may include enhancement transistors or depletion transistors in which a dopant ion-implanted region is formed at channel portions.

REFERENCES:
patent: 4532594 (1985-07-01), Hosaka et al.
patent: 5406514 (1995-04-01), Yoneda
patent: 5879992 (1999-03-01), Hsieh et al.
patent: 6523083 (2003-02-01), Lin et al.
patent: 6590253 (2003-07-01), Chen
patent: 6839278 (2005-01-01), Lee et al.
patent: 1 345 273 (2003-09-01), None
patent: 5-304277 (1993-11-01), None
patent: WO 02/43158 (2002-05-01), None

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