US4649522A
Expired / Lapsed
US
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Fast column access memory
Assignee: Nokia Bell Labs
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Filing: 1985-02-11
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Granted: 1987-03-10
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Expires: 2005-02-11
Abstract
Abstract A dynamic random access memory obtains improved access time for reading data from a multiplicity of memory cells along a given selected row. This is obtained by allowing the output data line to remain active between activations of a column enable signal. An increase in data valid time at the memory output is obtained, while allowing increased latitude in memory address setup time.
Inventors
- 👤 Howard C. Kirsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:16
CPC Classifications
G; G11; G11C; G11C7/00; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/401; G11C11/4063; G11C11/407; G11C11/409; G11C11/4096; G11C7/10; G11C7/1015; G11C7/1018; G11C7/1021; G11C7/1024; G11C8/00; G11C8/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
149 words
An integrated circuit random access memory comprising: a multiplicity of memory cells; row decoding means adapted to select a desired row of memory cells when a row enable signal (RE) is applied; column decoding means adapted to accept a column address and to select a specified column of memory cells each time a column enable signal (CE) is applied; CHARACTERIZED IN THAT said integrated circuit further comprises means for providing valid output data read onto a data output line from at least two selected memory cells located on a given selected row, with said providing beginning with the first application of said column enable (CE) signal following an application of said row enable (RE) signal, and ending when both said row enable (RE) and column enable (CE) signals are terminated, and with said data output line being placed in a high impedance state at times other than said providing.
Claim 2
Dependent Claim
149 words
An integrated circuit random access memory comprising: a multiplicity of memory cells; row decoding means adapted to select a desired row of memory cells when a row enable signal (RE) is applied; column decoding means adapted to accept a column address and to select a specified column of memory cells each time a column enable signal (CE) is applied; CHARACTERIZED IN THAT said integrated circuit further comprises means for providing valid output data read onto a data output line from at least two selected memory cells located on a given selected row, with said providing beginning with the first application of said column enable (CE) signal following an application of said row enable (RE) signal, and ending when both said row enable (RE) and column enable (CE) signals are terminated, and with said data output line being placed in a high impedance state at times other than said providing.
Claim 3
Dependent Claim
23 words
The integrated circuit of claim 1 wherein an input terminal (G) is provided for placing said output line in a high impedance state.
Claim 4
Dependent Claim
19 words
The integrated circuit of claim 1 wherein one memory cell is selected per application of said column enable signal.
Claim 5
Dependent Claim
40 words
The integrated circuit of claim 1 wherein more than one memory cell is selected per application of said column enable signal, and wherein a separate output means is provided for the data output of each cell selected per said application.
Claim 6
Dependent Claim
45 words
The integrated circuit of claim 1 wherein said means for providing valid output data allows said data read in response to a given application of said column enable signal to remain valid for a given period after the next application of said column enable signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |