Texas Instruments Corporation

Douglas Edward Shelton

John Howard MacPeak

Eddie Hearl Breashears

Bruce Lynn Pickelsimer

A method to adjust the programming voltage in flash memory when the programming time exceeds specification. A method to adjust the programming voltage of flash memory after a predetermined number of erase/write cycles.

Adaptive programming for flash memories

An electrically programmable non-volatile memory array and associated circuitry, including programming circuitry that adaptively senses completed programming of a selected memory cell. A programming bit line driver is connected to the bit line, and a first transistor has its source/drain path connected in series with the memory cell, and its gate connected to the output of the current comparator. As the MOS transistor in the selected cell becomes programmed, its drain current drawn from the bit line driver decays, and a remainder current into the current comparator increases. Upon the remainder current exceeding the reference current, the comparator turns off the first transistor; a second transistor connected between the source and drain of the cell transistor is turned on. In another approach, a summed current controls the gates of the first and second transistors. Programming terminates, and over-programming is avoided.

Programming of memory cells in a nonvolatile memory using an active transition control

An electrically erasable programmable read-only memory (EEPROM) with a ripple programming mode. Memory cells in an the EEPROM array include floating-gate transistors with control gates coupled to corresponding word lines, and drain electrodes coupled to corresponding bit lines. A memory cell is programmed by applying a high programming voltage to its control gate along with applying a high programming voltage to its drain. Multiple memory cells within a row can be programmed by applying the programming voltage to the word line of that row, during which multiple bit lines receive their programming voltage, without removing the word line programming voltage when changing the programming from one bit line to another.

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Wylie, TX, United States of America

Douglas Edward Shelton