US4653025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Random access memory with high density and low power
Assignee: Hitachi Ltd
•
Filing: 1984-12-21
•
Granted: 1987-03-24
•
Expires: 2004-12-21
Abstract
Abstract A static RAM having a plurality of memory cells. Each memory cell consists of driver MOST's that are connected to each other in a crossing manner, and transfer MOST's that connect storage nodes of the memory cell to the data lines. The driver MOST's are comprised of n-channel MOST's, and the transfer MOST's are comprised of p-channel MOST's.
Inventors
- 👤 Osamu Minato
- 👤 Masakazu Aoki
- 👤 Yuji Yatsuda
- 👤 Katsuaki Takagi
- 👤 Masashi Horiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:02
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/41; G11C11/412
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
290 words
A semiconductor memory comprising: a plurality of memory cells each of which is comprised of: a first n-channel MOST and a second n-channel MOST, each of which is provided in a p-type semiconductor body, the gate of said first n-channel MOST being connected to the drain of said second n-channel type MOST, and the gate of said second n-channel type MOST being connected to the drain of said first n-channel type MOST; and a first p-channel MOST and a second p-channel MOST, each of which is provided in an n-type semiconductor body, the drain of said first p-channel MOST being coupled to the drain of said first n-channel MOST to constitute a first storage node, and the drain of said second p-channel MOST being coupled to the drain of said second n-channel MOST to constitute a second storage node; a plurality of first and second data lines each of which is coupled to the source of the first and second p-channel MOSTs in the memory cells; a plurality of word lines coupled to the gates of the first and second p-channel MOSTs in the memory cells; a first terminal region provided in said n-type body and coupled to a first power source terminal so as to bias said drains of the p-channel MOSTs in reverse and supply a current in reverse bias ILp to said drains of the p-channel MOSTs; and a second terminal region provided in said p-type body and coupled to a second power source terminal so as to bias said drains of the n-channel MOSTs in reverse, wherein said current in reverse bias ILp is greater than a current in reverse bias ILn that flows from said drains of the n-channel MOSTs into said second terminal region.
Claim 2
Dependent Claim
290 words
A semiconductor memory comprising: a plurality of memory cells each of which is comprised of: a first n-channel MOST and a second n-channel MOST, each of which is provided in a p-type semiconductor body, the gate of said first n-channel MOST being connected to the drain of said second n-channel type MOST, and the gate of said second n-channel type MOST being connected to the drain of said first n-channel type MOST; and a first p-channel MOST and a second p-channel MOST, each of which is provided in an n-type semiconductor body, the drain of said first p-channel MOST being coupled to the drain of said first n-channel MOST to constitute a first storage node, and the drain of said second p-channel MOST being coupled to the drain of said second n-channel MOST to constitute a second storage node; a plurality of first and second data lines each of which is coupled to the source of the first and second p-channel MOSTs in the memory cells; a plurality of word lines coupled to the gates of the first and second p-channel MOSTs in the memory cells; a first terminal region provided in said n-type body and coupled to a first power source terminal so as to bias said drains of the p-channel MOSTs in reverse and supply a current in reverse bias ILp to said drains of the p-channel MOSTs; and a second terminal region provided in said p-type body and coupled to a second power source terminal so as to bias said drains of the n-channel MOSTs in reverse, wherein said current in reverse bias ILp is greater than a current in reverse bias ILn that flows from said drains of the n-channel MOSTs into said second terminal region.
Claim 3
Dependent Claim
36 words
A semiconductor memory according to claim 1, wherein the ratio of mutual conductance of the first and second p-channel MOSTs to mutual conductance of the first and second n-channel MOSTs is set to be about 1:2.
Claim 4
Dependent Claim
38 words
A semiconductor memory according to claim 1, wherein the ratio of channel width/channel length of the first and second p-channel MOSTs to channel width/channel length of the first and second n-channel MOSTs is set to be about 1:2.
Claim 5
Dependent Claim
31 words
A semiconductor memory according to claim 1. further including means to select a word line by lowering the voltage of the word line from a high level to a low level.
Claim 6
Dependent Claim
37 words
A semiconductor memory according to claim 1, further comprising a trench region which is provided so as to isolate said p-type body from said n-type body, said trench region having a narrow width but a large depth.
Claim 7
Dependent Claim
17 words
A semiconductor memory according to claim 5, wherein an insulating material is provided in said trench region.
Claim 8
Dependent Claim
38 words
A semiconductor memory according to claim 5, wherein a conductive material is provided in said insulating material and is set at a certain potential so as to form a depletion layer along said trench in said n-type body.
Claim 9
Dependent Claim
29 words
A semiconductor memory according to claim 5, further comprising a p-type region which is provided under the drain of said p-channel MOST along said trench in said n-type body.
References Cited (Backward Citations)
JPS5651088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-23 | 1990-09-22 | 1991-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-23 | 1994-09-22 | 1995-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-23 | 1998-09-22 | 1999-03-24 | $7700.00 | Window Closed / Lapsed |