Semiconductor device with small current consumption having stably operating internal circuitry
AssigneesMitsubishi Denki Kabushiki Kaisha, Mitsubishi Electric System LSI Design Corporation
InventorKazuo Asami
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Abstract
In a non-contact IC card, corresponding to increase/decrease of an operation current of an internal circuitry, absorbing current of an ICC fluctuation absorbing circuit is temporarily decreased/increased by the amount corresponding to the increase/decrease, and thereafter, the absorbing current is gradually increased/decreased to the initial value and an output current of a regulator is gradually increased/decreased. Therefore, abrupt change in output current of the regulator can be prevented, and an internal power supply potential can be stabilized.
Claims11
A semiconductor device, comprising:
- an internal circuitry receiving a driving current from a power supply node and performing a prescribed operation;
- a current supplying circuit capable of controlling a supply current for supplying current to said power supply node;
- a current absorbing circuit capable of controlling an absorbing current for absorbing a current from said power supply node;
- and
- a control circuit for controlling each of the supply current of said current supplying circuit and the absorbing current of said current absorbing circuit so that said power supply node attains to a predetermined potential;
- wherein
- said control circuit once decreases/increases and thereafter increases/decreases said absorbing current and increases/decreases said supply current, in response to increase/decrease of the driving current of said internal circuitry.
Dependencies are inferred from the claim text.