Semiconductor device
AssigneeRenesas Electronics Corporation
InventorTakashi Ito
Life of this patent
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Abstract
A control logic unit generates a control signal which is activated while a power supply normally operates. A charge circuit is connected to a first node on a voltage control line supplied with a voltage generated by a voltage generation circuit, so that its capacitive element is charged with electric charge. A first discharge circuit is connected to a charge storage node of the charge circuit and discharges the stored electric charge when the control signal is activated. A second discharge circuit discharges the first node when the charge storage node has a potential exceeding a predetermined potential.
Claims10
A semiconductor device comprising:
- a plurality of memory cells each storing data depending on a change in level of a threshold voltage;
- a voltage generation circuit generating a voltage to be applied to said memory cell;
- a control logic unit generating a control signal activated while a power supply voltage is normally supplied;
- a charge circuit connected to a first node on a voltage control line supplied with the voltage generated by said voltage generation circuit, said charge circuit including a second node and a capacitive element connected to said second node;
- a first discharge circuit connected to said second node, and connecting said second node to a ground when said control signal is activated;
- and
- a second discharge circuit connecting said first node to said ground when a voltage of said second node exceeds a threshold value.
A semiconductor device comprising:
- a plurality of memory cells each storing data depending on a change in level of a threshold voltage;
- a voltage generation circuit generating a voltage to be applied to said memory cell;
- a control logic unit generating a control signal periodically activated to indicate that a power supply voltage is normally supplied;
- and
- a circuit receiving said control signal, detecting short interruption of said power supply voltage from said control signal failing to be regularly activated, and accordingly discharging a voltage of a first node on a voltage control line supplied with the voltage generated by said voltage generation circuit.
Dependencies are inferred from the claim text.