摘要:
There is provided a non-volatile storage device including: a bit line that is connected to a non-volatile storage element and is applied with a voltage of magnitude corresponding to the logic value stored in the storage element; a charging section that charges the bit line to a voltage of equivalent magnitude to the reference voltage; a voltage generation section that is connected between the reference voltage line and the bit line, comprises a capacitance load for generating coupling charge when charging by the charging section has been performed, and employs the capacitance load to generate a voltage according to a difference between the magnitude of the voltage of the reference voltage line and the magnitude of the voltage of the bit line as a voltage expressing the comparison result; and a charge absorbing section for absorbing the coupling charge generated by the capacitance load.
摘要:
In a verify operation after a write or erase to check whether a memory cell threshold voltage is contained in a predetermined threshold voltage distribution, verify voltage is changed in three stages or more in a direction to mitigate the decision condition. This prevents non-convergence of write and erase operation and can complete the write or erase in a short time.
摘要:
A nonvolatile semiconductor memory device and a method of reusing the same that allow a good use of the semiconductor device without degrading characteristics even when reused. The semiconductor memory device comprises information holding means for holding information that indicates an operation mode of said memory cell array, a decoder for generating, to said memory cell array, a selection signal to designate at least a read address of said memory cell array in accordance with an address signal that comprises plural bits; and mode setting means for fixing a logical value of at least one bit of said plural bits of said address signal in accordance with the information held by said information holding means, and supplying said address signal, on which fixing of the logical value is effected, to said decoder.
摘要:
A semiconductor integrated circuit has a first nonvolatile memory area and a second nonvolatile memory area to store information in accordance with a variable threshold voltage. At least one condition of the following conditions of the first nonvolatile memory area is made different from that of the second nonvolatile memory area: erase verify determination memory gate voltage, erase verify determination memory current, write verify determination memory gate voltage, write verify determination memory current, erase voltage, erase voltage application time, write voltage, and write voltage application time in the first nonvolatile memory area.
摘要:
A semiconductor device includes a plurality of nonvolatile memory cells (1). Each of the nonvolatile memory cells comprises a MOS type first transistor section (3) used for information storage, and a MOS type second transistor section (4) which selects the first transistor section. The second transistor section has a bit line electrode (16) connected to a bit line, and a control gate electrode (18) connected to a control gate control line. The first transistor section has a source line electrode (10) connected to a source line, a memory gate electrode (14) connected to a memory gate control line, and a charge storage region (11) disposed directly below the memory gate electrode. A gate withstand voltage of the second transistor section is lower than that of the first transistor section. Assuming that the thickness of a gate insulating film of the second transistor section is defined as tc and the thickness of a gate insulating film of the first transistor section is defined as tm, they have a relationship of tc
摘要:
A semiconductor device includes a plurality of nonvolatile memory cells (1). Each of the nonvolatile memory cells comprises a MOS type first transistor section (3) used for information storage, and a MOS type second transistor section (4) which selects the first transistor section. The second transistor section has a bit line electrode (16) connected to a bit line, and a control gate electrode (18) connected to a control gate control line. The first transistor section has a source line electrode (10) connected to a source line, a memory gate electrode (14) connected to a memory gate control line, and a charge storage region (11) disposed directly below the memory gate electrode. A gate withstand voltage of the second transistor section is lower than that of the first transistor section. Assuming that the thickness of a gate insulating film of the second transistor section is defined as tc and the thickness of a gate insulating film of the first transistor section is defined as tm, they have a relationship of tc
摘要:
A nonvolatile memory includes a control register (CRG) for providing instructions as to basic operations such as writing, erasing, reading, etc., a boosted voltage attainment detecting circuit for detecting whether a voltage boosted by a booster circuit has reached a desired level, a circuit which counts the time required to apply each of write and erase voltages, and a circuit which detects the completion of the writing or erasing. Respective operations are automatically advanced by simple setting of the operation instructions to the control register. After the completion of the operations, an end flag (FLAG) provided within the control register is set to notify the completion of the writing or erasing.
摘要:
A nonvolatile semiconductor memory device and a method of reusing the same that allow a good use of the semiconductor device without degrading characteristics even when reused. The semiconductor memory device comprises information holding means for holding information that indicates an operation mode of said memory cell array, a decoder for generating, to said memory cell array, a selection signal to designate at least a read address of said memory cell array in accordance with an address signal that comprises plural bits; and mode setting means for fixing a logical value of at least one bit of said plural bits of said address signal in accordance with the information held by said information holding means, and supplying said address signal, on which fixing of the logical value is effected, to said decoder.
摘要:
A semiconductor device includes a plurality of nonvolatile memory cells (1). Each of the nonvolatile memory cells comprises a MOS type first transistor section (3) used for information storage, and a MOS type second transistor section (4) which selects the first transistor section. The second transistor section has a bit line electrode (16) connected to a bit line, and a control gate electrode (18) connected to a control gate control line. The first transistor section has a source line electrode (10) connected to a source line, a memory gate electrode (14) connected to a memory gate control line, and a charge storage region (11) disposed directly below the memory gate electrode. A gate withstand voltage of the second transistor section is lower than that of the first transistor section. Assuming that the thickness of a gate insulating film of the second transistor section is defined as tc and the thickness of a gate insulating film of the first transistor section is defined as tm, they have a relationship of tc
摘要:
A semiconductor device includes a plurality of nonvolatile memory cells (1). Each of the nonvolatile memory cells comprises a MOS type first transistor section (3) used for information storage, and a MOS type second transistor section (4) which selects the first transistor section. The second transistor section has a bit line electrode (16) connected to a bit line, and a control gate electrode (18) connected to a control gate control line. The first transistor section has a source line electrode (10) connected to a source line, a memory gate electrode (14) connected to a memory gate control line, and a charge storage region (11) disposed directly below the memory gate electrode. A gate withstand voltage of the second transistor section is lower than that of the first transistor section. Assuming that the thickness of a gate insulating film of the second transistor section is defined as tc and the thickness of a gate insulating film of the first transistor section is defined as tm, they have a relationship of tc