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US4415993A
Expired / Lapsed
US
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Fast access non-volatile memory
Assignee: United States Department of the Air Force
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Filing: 1981-11-23
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Granted: 1983-11-15
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Expires: 2001-11-23
Abstract
Abstract A memory apparatus having a row and column decoder for controlling the read and write function to a transistor memory pair. A single power/chip select pad is utilized to both power the memory and select the memory chip. External control signals are applied directly to critical internal node within the memory apparatus.
Inventors
- 👤 Philip C. Smith
- 👤 John L. Fagan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:16
CPC Classifications
G; G11; G11C; G11C16/00; G11C16/02; G11C16/06; G11C16/08; G11C16/34; G11C16/3418; G11C16/3431
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
277 words
A fast access non-volatile memory apparatus comprising in combination: a memory means to store a digital bit, a row decode means operatively connected to said memory means, a column decode means operatively connected to said memory means, said row decode means and said column decode means cooperating with each other to write and read data into and from said memory means, a data input means to receive input data, said data input means providing data signals to said row decode means and said column decode means, a latch means connected to said column decode menas to activate said column decode means, a reset means to receive a reset signal, said reset means providing said reset signal to said memory means and said row decode means, a read means to receive a read signal, said read means providing said read signal to said latch means, said read means generating an isolate latch signal, said read means applying said isolate latch signal to said latch means, a write means to receive a write signal, said write means generating a first and second write signal, said write means applying said first and second write signal to said memory means, a clear means to receive a clear signal, said clear means providing said clear signal to said memory means to clear said memory means, and an input/output means connected to said latch means, said latch means during a read cycle turning said input/output means off if said memory means digital bit is a logical one, and pulling said input/output means on if said memory means digital bit is a logical zero, said input/output means providing said digital bit as an output.
Claim 2
Dependent Claim
277 words
A fast access non-volatile memory apparatus comprising in combination: a memory means to store a digital bit, a row decode means operatively connected to said memory means, a column decode means operatively connected to said memory means, said row decode means and said column decode means cooperating with each other to write and read data into and from said memory means, a data input means to receive input data, said data input means providing data signals to said row decode means and said column decode means, a latch means connected to said column decode menas to activate said column decode means, a reset means to receive a reset signal, said reset means providing said reset signal to said memory means and said row decode means, a read means to receive a read signal, said read means providing said read signal to said latch means, said read means generating an isolate latch signal, said read means applying said isolate latch signal to said latch means, a write means to receive a write signal, said write means generating a first and second write signal, said write means applying said first and second write signal to said memory means, a clear means to receive a clear signal, said clear means providing said clear signal to said memory means to clear said memory means, and an input/output means connected to said latch means, said latch means during a read cycle turning said input/output means off if said memory means digital bit is a logical one, and pulling said input/output means on if said memory means digital bit is a logical zero, said input/output means providing said digital bit as an output.
Claim 3
Dependent Claim
21 words
A memory apparatus as described in claim 1 wherein said row decode means comprises a plurality of buffer units in series.
Claim 4
Dependent Claim
23 words
A memory apparatus as described in claim 1 wherein said column decode means comprises two or more columns of buffer units in series.
Claim 5
Dependent Claim
18 words
A memory apparatus as described in claim 1 wherein said memory means comprises a pair of memory transistors.
Claim 6
Dependent Claim
34 words
A memory apparatus as described in claim 1 further including charging means for controlling the output of said row decode means, said charging pre-charging said row decode means in response to said reset signal.
Claim 7
Dependent Claim
38 words
A memory apparatus as described in claim 1 further including a power/chip select means connected to each of said means which comprises said memory apparatus, said power/chip select means providing a power/chip select signal to said memory apparatus.
References Cited (Backward Citations)
US4360900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |