US4247915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Punch-through load devices in high density static memory cell
Assignee: Texas Instruments Inc
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Filing: 1979-01-02
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Granted: 1981-01-27
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Expires: 1999-01-02
Abstract
Abstract A semiconductor memory of the static type employs a pair of cross-coupled driver transistors and a pair of access transistors along with load devices which are punch-through elements resembling short channel MOS transistors without gates. The punch-through elements each have an electrode integral with the drain of one of the driver transistors, and another electrode coupled to a voltage supply. A cell layout of very small size is possible.
Inventors
- 👤 Keith G. Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:25
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/41; G11C11/412; H; H10; H10B; H10B10/00; H10B10/12; Y; Y10; Y10S; Y10S257/00; Y10S257/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
229 words
A static memory cell of the type formed in a face of a semiconductor body and having: a pair of driver transistors each having source and drain regions, a channel, and a gate, the source and drain regions being formed by heavily doped regions in the face of the semiconductor body, the gates overlying the channels and separated therefrom by a gate oxide layer; conductive means separately connecting the drain regions of each of the driver transistors to the gate of the other driver transistor to provide a cross-coupled bistable circuit, the conductive means overlying said layer of field oxide; a pair of access transistors each having a source to drain path and a gate; p1 a pair of data lines on said face with means coupling each date line separately through the source to drain path of a different one of the access transistors to the drain region of a different one of the driver transistors; and an address line on said face connected to the gate of both of the access transistors; the improvement comprising: a pair of load devices at said face of the body with each load device being a punch-through MOS short channel transistor having one electrode coupled to a voltage supply line on said face and a second electrode coupled separately to a different one of said drain regions on the driver transistors.
Claim 2
Dependent Claim
229 words
A static memory cell of the type formed in a face of a semiconductor body and having: a pair of driver transistors each having source and drain regions, a channel, and a gate, the source and drain regions being formed by heavily doped regions in the face of the semiconductor body, the gates overlying the channels and separated therefrom by a gate oxide layer; conductive means separately connecting the drain regions of each of the driver transistors to the gate of the other driver transistor to provide a cross-coupled bistable circuit, the conductive means overlying said layer of field oxide; a pair of access transistors each having a source to drain path and a gate; p1 a pair of data lines on said face with means coupling each date line separately through the source to drain path of a different one of the access transistors to the drain region of a different one of the driver transistors; and an address line on said face connected to the gate of both of the access transistors; the improvement comprising: a pair of load devices at said face of the body with each load device being a punch-through MOS short channel transistor having one electrode coupled to a voltage supply line on said face and a second electrode coupled separately to a different one of said drain regions on the driver transistors.
Claim 3
Dependent Claim
42 words
A memory cell according to claim 1 wherein the semiconductor body is predominantly P-type silicon, the heavily doped regions are N-type, the gates are polycrystalline silicon, and a layer of thick field oxide surrounds said source and drain regions and said channel.
Claim 4
Dependent Claim
29 words
A memory cell according to claim 1 wherein said second electrode of each of the short channel transistors is an N+ region contiguous with one of said drain regions.
Claim 5
Dependent Claim
31 words
A cell according to claim 3 wherein each of said short channel transistors has a channel between said one electrode and said second electrode, the channel having no polysilicon gate thereon.
Claim 6
Dependent Claim
48 words
A cell according to claim 4 wherein the source to drain paths of the access transistors include heavily doped regions in the face of the body self-aligned with the gates of the access transistors, such heavily doped regions not being covered by said layer of thermal field oxide.
Claim 7
Dependent Claim
47 words
A cell according to claim 5 wherein said voltage supply line is a conductive metal strip overlying but insulated from an elongated heavily doped region, forming a ground line contiguous with said source regions and wherein said pair of data lines are conductive strips on said face.
Claim 8
Dependent Claim
18 words
A cell according to claim 6 wherein said data lines overlie said drain regions and said access transistors.
Claim 9
Dependent Claim
19 words
A cell according to claim 7 wherein said pair of data lines separately overlie said pair of load devices.
Claim 10
Dependent Claim
26 words
A cell according to claim 8 wherein said heavily doped regions of said access transistors include regions contiguous with said drain regions of the driver transistors.
Claim 11
Dependent Claim
38 words
A cell according to claim 9 wherein said load devices include doped regions in said face spaced from said drain regions of the driver transistors, and a polysilicon strip connects such doped regions to said voltage supply line.
References Cited (Backward Citations)
US4158239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |