US4446536A
Expired / Lapsed
US
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Complementary metal oxide semiconductors address drive circuit
Assignee: McDonnell Douglas Corp
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Filing: 1982-06-21
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Granted: 1984-05-01
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Expires: 2002-06-21
Abstract
Abstract An address drive circuit for use on programmable, nonvolatile, semiconductor memories which use either Metal Nitrite Oxide Semiconductor (MNOS) or "floating gate" transistors for Electrically Erasable Programmable Read Only Memory Storage (EEPROMS). The inventive drive circuit is based on the use of prior art high voltage Complementary Metal Oxide Semiconductors (CMOS) transistors which have junction diode breakdown limits exceeding the maximum "device drain voltage" (V DD ) to be switched. This circuit has negligible direct current power dissipation, high speed memory read/write capability, and requires minimum physical installation area.
Inventors
- 👤 Richard W. Rodgers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:13
CPC Classifications
G; G11; G11C; G11C16/00; G11C16/02; G11C16/06; G11C16/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
255 words
An address drive circuit for biasing a row of storage transistors in an electrically programmable memory during memory read and write operations, and during unselected quiescent conditions comprising: a plurality of drivers, each including first and second transistors having a gate, a source, a drain and substrate, each said driver including an addressing terminal commonly connected to the gates of said first and second transistors for receiving an addressing signal, the drain of said second transistor and the source of said first transistor commonly connected to the gates of a plurality of said storage transistors, and the drain and substrate of said first transistor connected to a ground voltage; control means for providing an output voltage to said drivers, said control means having third, fourth and fifth transistors, each of said transistors having a gate, a source, a drain, and a substrate, said control means having an input control line connected to the gates of each said transistors to receive a first, second and third control signals respectively concurrently applied thereto, having the source and substrate of said fourth transistor coupled to a first supply voltage, having the source of said fifth transistor coupled to a second supply voltage, and having the drain and substrate of said third transistor and the substrate of said fifth transistor coupled to the ground potential; and means for interconnecting the source and substrate of said second transistor of each said drivers with the source and substrate of said third transistor and the drains of said fourth and fifth transistors.
Claim 2
Dependent Claim
255 words
An address drive circuit for biasing a row of storage transistors in an electrically programmable memory during memory read and write operations, and during unselected quiescent conditions comprising: a plurality of drivers, each including first and second transistors having a gate, a source, a drain and substrate, each said driver including an addressing terminal commonly connected to the gates of said first and second transistors for receiving an addressing signal, the drain of said second transistor and the source of said first transistor commonly connected to the gates of a plurality of said storage transistors, and the drain and substrate of said first transistor connected to a ground voltage; control means for providing an output voltage to said drivers, said control means having third, fourth and fifth transistors, each of said transistors having a gate, a source, a drain, and a substrate, said control means having an input control line connected to the gates of each said transistors to receive a first, second and third control signals respectively concurrently applied thereto, having the source and substrate of said fourth transistor coupled to a first supply voltage, having the source of said fifth transistor coupled to a second supply voltage, and having the drain and substrate of said third transistor and the substrate of said fifth transistor coupled to the ground potential; and means for interconnecting the source and substrate of said second transistor of each said drivers with the source and substrate of said third transistor and the drains of said fourth and fifth transistors.
Claim 3
Dependent Claim
36 words
An address drive circuit as recited in claim 1 wherein the first supply voltage is the Device Drain Voltage (V DD ) and the second supply voltage is less in magnitude than the first supply voltage.
Claim 4
Dependent Claim
40 words
An address drive circuit as recited in claim 2, wherein said first, second, third, fourth, and fifth transistors are high voltage complementary metal oxide semiconductors (CMOS) transistors with junction diode breakdown limits exceeding the Device Drain Voltage (V DD ).
Claim 5
Dependent Claim
17 words
An address drive circuit as recited in claim 3, wherein said interconnecting means is a power rail.
Claim 6
Dependent Claim
128 words
An address drive circuit as recited in claim 4, wherein said first transistor is an N-channel transistor formed in a P-type epitaxial layer grown in an N-type wafer substrate, said fourth transistor is a P-channel transistor formed in a first N-well structure formed in said epitaxial layer, said third transistor is an N-channel transistor formed in said epitaxial layer, said second transistor is a P-channel transistor formed in a second N-well structure formed in said epitaxial layer, and said fifth transistor is an N-channel transistor formed in said epitaxial layer; and wherein said wafer substrate and said first N-well structure are charged to the first supply voltage, said second N-well structure is charged to the power rail voltage and said epitaxial layer is charged to the ground potential.
Claim 7
Dependent Claim
99 words
An address drive circuit as recited in claim 5, wherein the first control signal is equal to the second supply voltage, the second control signal is equal to the first supply voltage, and the third control signal is equal to the ground potential; and wherein said control signals are applied, during memory unselected quiescent conditions, to the input control lines of said third, fourth and fifth transistors, respectively, so as to render nonconductive said fourth and fifth transistors and to render conductive said third transistor, charging the source of said third transistor and said power rail to ground potential.
Claim 8
Dependent Claim
105 words
An address drive circuit as recited in claim 5, wherein the first control input signal is equal to the ground potential, the second control input signal is equal to the first supply voltage, and the third control input signal is equal to the first supply voltage; and wherein said control input signals are applied, during a memory read operation, to the input control lines of said third, fourth and fifth transistors, respectively, so as to render nonconductive said third and fourth transistors and to render conductive said fifth transistor, charging the drain of said fifth transistor and said power rail to the second supply voltage.
Claim 9
Dependent Claim
79 words
An address drive circuit as recited in claim 5, wherein the first, second and third control signals are equal to the ground potential; and wherein said control signals are applied, during a memory write operation, to the input control lines, of said third, fourth and fifth transistors, respectively, so as to render nonconductive said fourth transistors and to render conductive said fourth transistor, charging the drain of said fourth transistor and said power rail to the first supply voltage.
Claim 10
Dependent Claim
90 words
An address drive circuit as recited in claim 6, wherein the voltage of said power rail is applied to the source and substrate of said second transistor, an addressing signal equal to the first supply voltage is applied concurrently to the control signals, to the addressing line of said drivers so that said second transistor is rendered nonconductive and said first transistor is rendered conductive, charging the source of said first transistor, the drain of said second transistor and the gates of all said storage transistors to the ground potential.
Claim 11
Dependent Claim
94 words
An address drive circuit as recited in claim 7, wherein the voltage of said power rail is applied to the source and substrate of said second transistor, an addressing signal equal to the ground potential is applied, concurrently to the control signals, to the addressing line of the addressed driver so that said second transistor is rendered conductive and said first transistor is rendered nonconductive, charging the source of said first transistor, the drain of said second transistor and the gates of the connected row of said storage transistors to the second supply voltage.
Claim 12
Dependent Claim
96 words
An address drive circuit as recited in claim 8, wherein the voltage of said power rail is applied to the source and substrate of said second transistor, an addressing input signal equal to the ground potential is applied, concurrently to said control input signals, to the addressing line of the addressed driver, so that said second transistor is rendered conductive and said first transistor is rendered nonconductive, charging the source of said first transistor, the drain of said second transistor and the gates of the connected row of said storage transistors to the first supply voltage.
Claim 13
Dependent Claim
127 words
An address drive circuit as recited in claim 4, wherein said first transistor is a P-channel transistor formed in an N-type epitaxial layer grown in a P-type wafer substrate, said fourth transistor is an N-channel transistor formed in a first P-well structure formed in said epitaxial layer, said third transistor is a P-channel transistor formed in said epitaxial layer, said second transistor is an N-channel transistor formed in a second N-well structure formed in said epitaxial layer, and said fifth transistor is a P-channel transistor formed in said epitaxial layer; wherein said wafer substrate and said first P-well structure are charged to the first supply voltage, said second P-well structure is charged to the power rail voltage and said epitaxial layer is charged to the ground potential.
References Cited (Backward Citations)
US4144587A
Cited
US4099264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |