Method for writing in an EEPROM memory and corresponding device
First Claim
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1. A method, comprising:
- applying an erase voltage to a first control gate in a first erasing phase, a first transistor comprising the first control gate, a first floating gate underlying the first control gate, and a first gate dielectric underlying the first floating gate;
applying the erase voltage to a second control gate in the first erasing phase, a second transistor comprising the second control gate, a second floating gate underlying the second control gate, and a second gate dielectric underlying the second floating gate, wherein the second floating gate is coupled to the first floating gate to form a common floating gate;
applying a zero voltage to a drain of the first transistor and a drain of the second transistor in the first erasing phase;
maintaining the first control gate and the second control gate at the erase voltage in a second erasing phase;
maintaining the drain of the first transistor at the zero voltage in the second erasing phase; and
applying a first auxiliary voltage to the drain of the second transistor in the second erasing phase.
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Abstract
A method can be used for writing in a memory location of the electrically-erasable and programmable memory type. The memory location includes a first memory cell with a first transistor having a first gate dielectric underlying a first floating gate and a second memory cell with a second transistor having a second gate dielectric underlying a second floating gate that is connected to the first floating gate. In a first writing phase, an identical tunnel effect is implemented through the first gate dielectric and the second gate dielectric. In a second writing phase, a voltage across the first gate dielectric but not the second gate dielectric is increased.
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Citations
20 Claims
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1. A method, comprising:
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applying an erase voltage to a first control gate in a first erasing phase, a first transistor comprising the first control gate, a first floating gate underlying the first control gate, and a first gate dielectric underlying the first floating gate; applying the erase voltage to a second control gate in the first erasing phase, a second transistor comprising the second control gate, a second floating gate underlying the second control gate, and a second gate dielectric underlying the second floating gate, wherein the second floating gate is coupled to the first floating gate to form a common floating gate; applying a zero voltage to a drain of the first transistor and a drain of the second transistor in the first erasing phase; maintaining the first control gate and the second control gate at the erase voltage in a second erasing phase; maintaining the drain of the first transistor at the zero voltage in the second erasing phase; and applying a first auxiliary voltage to the drain of the second transistor in the second erasing phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A memory device, comprising:
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a memory location comprising; a first transistor comprising a first control gate, a first floating gate underlying the first control gate, and a first gate dielectric underlying the first floating gate; a second transistor comprising a second control gate, a second floating gate underlying the second control gate, and a second gate dielectric underlying the second floating gate, wherein the second floating gate is coupled to the first floating gate to form a common floating gate; a processor; and a computer-readable storage medium storing a program to be executed by the processor, the program including instructions for; applying an erase voltage to the first control gate and the second control gate in a first erasing phase; applying a zero voltage to a drain of the first transistor and a drain of the second transistor in the first erasing phase; maintaining the first control gate and the second control gate at the erase voltage in a second erasing phase; maintaining the drain of the first transistor at the zero voltage in the second erasing phase; and applying a first auxiliary voltage to the drain of the second transistor in the second erasing phase. - View Dependent Claims (15, 16)
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17. A method for writing a first memory cell of a memory location of an electrically-erasable and programmable memory type, wherein the first memory cell comprises a first transistor having a first control gate, a first floating gate underlying the first control gate, and a first gate dielectric underlying the first floating gate, the memory location further comprising a second memory cell comprising a second transistor having a second control gate, a second floating gate underlying the second control gate, and a second gate dielectric underlying the second floating gate, wherein the second floating gate is coupled to the first floating gate to form a common floating gate, the method comprising:
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applying an erase voltage to the first control gate and to the second control gate and applying a zero voltage to a drain of the first transistor and a drain of the second transistor in a first writing phase, wherein an identical tunnel effect is implemented through the first gate dielectric and the second gate dielectric in the first writing phase; and maintaining the zero voltage on the drain of second transistor and applying an auxiliary voltage to the drain of the first transistor in a second writing phase, the auxiliary voltage having a value chosen so as to increase a potential of the first floating gate of the first transistor, and wherein a voltage across the first gate dielectric but not the second gate dielectric is increased in the second writing phase. - View Dependent Claims (18, 19, 20)
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Specification