US 2006/0140003 A1 · Non volatile semiconductor memory device

Abstract

In a nonvolatile semiconductor memory device, the increase of the capacity of a nonvolatile semiconductor memory inevitably causes the power supply circuits including the charge pump circuits at the periphery to increase. In view of the above situation, the object of the present invention is to provide a technology of allowing a nonvolatile semiconductor memory to increase the capacity without increasing the power supply circuits which are the peripheral circuits of the nonvolatile semiconductor memory. It is possible to carry out the erase and write of plural memory cell blocks by selecting memory cell blocks one by one in a power supply circuit containing a charge pump circuit having the capability of carrying out the erase and write of a memory cell block and it is also possible, at the time of read and standby, to increase the charge pump capability and select plural memory cell blocks by inputting clock signals having a frequency not less than the frequency of the clock signals at the time of the operations of erase and write to charge pumps.

Claims12

Dependent claims

A nonvolatile semiconductor memory device comprising:

a memory cell array comprising plural nonvolatile memory cell blocks;
a boosting circuit to supply a prescribed high voltage to said nonvolatile memory cell blocks;
a clock generation circuit to supply clock signals to said boosting circuit;
a high voltage selection circuit to detect the voltage output from said boosting circuit for each input of said clock signals and to output the signal of stopping supplying said clock signals to said clock generation circuit after said prescribed high voltage is attained;
and
a block selection circuit to supply said prescribed high voltage to at least one of said nonvolatile memory cell blocks.

3 more elements

Dependencies are inferred from the claim text.

Non volatile semiconductor memory device

Life of this patent

Non volatile semiconductor memory device

Life of this patent

Abstract

Claims12