US4665507A
Expired / Lapsed
US
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Semiconductor memory having load devices controlled by a write signal
Assignee: Hitachi Microcomputer System Ltd
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Filing: 1985-04-18
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Granted: 1987-05-12
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Expires: 2005-04-18
Abstract
Abstract To reduce the power dissipation of a static random access memory, a write enable signal is applied to the gates of load MOS transistors on bit lines which are connected to a memory cell. During the write-in time, the load MOS transistors are turned off so as to prevent as electric current from flowing from a power source into the earth through the memory cell.
Inventors
- 👤 Takafumi Gondou
- 👤 Eiichi Amada
- 👤 Kenichi Asano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:47
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/34; G11C11/40; G11C11/41; G11C11/413; G11C11/417; G11C11/419
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
257 words
A semiconductor memory device comprising: a plurality of word lines; a plurality of bit lines each connected to a power source through respective load transistors; a plurality of memory cells connected to said word lines and said bit lines; a data input circuit for receiving data and transmitting the data to the memory cells for storage; a pair of data lines connected in common to the data input circuit, the bit lines, and a sense amplifier; and a switching circuit including means to turn off all of the respective load transistors when the data is being written in the memory cells, wherein the switching circuit has a first logic circuit for generating an output signal corresponding to the logical product of a chip select signal and an inverted write cycle signal, a second logic circuit receiving the output signal from the first logic circuit and generating an output signal corresponding to variations in the output signal from the first logic circuit, a first delay circuit for delaying the output signal from the second logic circuit by a predetermined time, a second delay circuit for further delaying the delayed signal from the first delay circuit by a time determined by the time required for storing data in the memory cells, and a flip-flop circuit receiving the outputs of the first and second delay circuits as a set and a reset input, respectively, and generating a signal which is fed to the load transistors to turn off the load transistors when data is being written in the memory cells.
Claim 2
Dependent Claim
257 words
A semiconductor memory device comprising: a plurality of word lines; a plurality of bit lines each connected to a power source through respective load transistors; a plurality of memory cells connected to said word lines and said bit lines; a data input circuit for receiving data and transmitting the data to the memory cells for storage; a pair of data lines connected in common to the data input circuit, the bit lines, and a sense amplifier; and a switching circuit including means to turn off all of the respective load transistors when the data is being written in the memory cells, wherein the switching circuit has a first logic circuit for generating an output signal corresponding to the logical product of a chip select signal and an inverted write cycle signal, a second logic circuit receiving the output signal from the first logic circuit and generating an output signal corresponding to variations in the output signal from the first logic circuit, a first delay circuit for delaying the output signal from the second logic circuit by a predetermined time, a second delay circuit for further delaying the delayed signal from the first delay circuit by a time determined by the time required for storing data in the memory cells, and a flip-flop circuit receiving the outputs of the first and second delay circuits as a set and a reset input, respectively, and generating a signal which is fed to the load transistors to turn off the load transistors when data is being written in the memory cells.
Claim 3
Dependent Claim
61 words
A semiconductor memory device according to claim 1, having a plurality of pull-down transistors respectively connected to the sense amplifier and the data lines, and a circuit for generating a signal, being a logical product of said chip select signal and said write cycle signal, for turning off the pull-down transistors simultaneously with variation of input addresses during a write cycle.
Claim 4
Dependent Claim
50 words
A semiconductor memory device according to claim 1, wherein said load transistors are MOS transistors each of which has its source-drain path connected in series along said bit lines between said memory cells and said power source and its gate coupled to receive the output signal of said flip-flop circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-11 | 1990-11-10 | 1991-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-11 | 1994-11-10 | 1995-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-11 | 1998-11-10 | 1999-05-12 | $7700.00 | Window Closed / Lapsed |