Static information storage and retrieval – Read only systems – Semiconductive
Patent
1998-07-01
1999-09-28
Mai, Son
Static information storage and retrieval
Read only systems
Semiconductive
365 94, 257390, G11C 1700, G11C 1712
Patent
active
059598778
ABSTRACT:
To realize a type of mask ROM which can minimize the increase in the area while shortening the manufacturing cycle time. Multiple ROM memory cells with memory data stored in them corresponding to the presence/absence of via contacts are set in a matrix configuration between different metal wiring layers; the memory cells of the same row are connected to the same word line, the memory cells of the same column are connected to the same bit line; in addition, on each memory cell row, the gates are connected to the word line corresponding to that row, and the diffusion layer is connected to the diffusion layer of the adjacent diffusion transistor. In the read mode, by precharging the selected bit line to the prescribed potential and by setting the selected word line in the active state, the transistors on the selected row are set in the conductive state, and, corresponding to the presence/absence of the via contact of the selected memory cell, the selected bit line potential is set, and the memory data of the selected memory cell can be read.
REFERENCES:
patent: 5426605 (1995-06-01), Van Berkel et al.
patent: 5432730 (1995-07-01), Shubat et al.
patent: 5600586 (1997-02-01), Lee
patent: 5663903 (1997-09-01), Guo
patent: 5812448 (1998-09-01), Wen
Donaldson Richard L.
Kempler William B.
Mai Son
Texas Instruments Incorporated
LandOfFree
Mask ROM does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mask ROM, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mask ROM will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-711059