Semiconductor storage device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorHiroshi Tomotani
Life of this patent
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Abstract
The semiconductor storage device of this invention includes a memory cell array; word lines; bit lines; a peripheral circuit for controlling the potentials of the word lines and the bit lines; a peripheral circuit power line for connecting a power voltage supply terminal to the peripheral circuit; a peripheral circuit power switch; a memory cell array power line; a constant voltage supply line for connecting the word lines to ground; a word line switch for fixing a voltage disposed on the constant voltage supply line; and the like. The potential of the word lines is fixed by controlling the word line switch to be placed in a conducting state before switching the peripheral circuit power switch. Thus, data in the memory cells can be prevented from being destroyed by a transient current caused in turning on/off the switch.
Claims14
A semiconductor storage device comprising:
- a power voltage supply part for supplying a power voltage;
- a memory cell array connected to said power voltage supply part and including plural memory cells arranged in rows and columns;
- plural word lines, for selecting a row to be accessed, each extending along each row of said memory cell arrays and connected to said memory cells of the row;
- bit lines, for transferring data in a read operation or in a write operation, each extending along each column of said memory cell array and connected to said memory cells of the column;
- a peripheral circuit for conducting a write operation or a read operation on said memory cells included in said memory cell array;
- a peripheral circuit power line for connecting said memory as cell array to said peripheral circuit;
- a peripheral circuit power switch disposed on said peripheral circuit power line to be changed between a conducting state and a non-conducting state in accordance with an activated state and an inactivated state of said peripheral circuit, respectively;
- a constant voltage supply part for supplying a constant voltage within a range not affecting storage of data in said memory cells;
- at least one constant voltage supply line for connecting said plural word lines to said constant voltage supply part;
- and
- a voltage fixing switch disposed on said at least one constant voltage supply line to be changed between a non-conducting state and a conducting state in accordance with the activated state and the inactivated state of said peripheral circuit, respectively.
Dependencies are inferred from the claim text.