Semiconductor integrated circuit device with a constant current

Details Semiconductor integrated circuit device with a constant current Semiconductor integrated circuit device with a constant current

1998-02-26

1999-11-16

Nelms, David

Static information storage and retrieval

Floating gate

Particular biasing

36518907, G11C 1134

Patent

active

059869402

ABSTRACT:
The semiconductor integrated circuit device includes memory cells the conductive state of which is changed in accordance with the data stored therein when selected, a sensing circuit having sense nodes for sensing the data stored in the memory cell. A constant current source according to the present invention supplies a current corresponding to the leak current to be detected on the sense node, as a load current in a leak current check where the memory cell is set in a non-selected state and the leak current flowing through the memory cell is detected. Accordingly, the device can ensure a large reading margin even in checking the leak current flowing through the memory cell, prevent the increase in total area of the integrated circuit, and prevent the alternate current characteristics in the ordinary data reading from being adversely affected.

REFERENCES:
patent: 5450361 (1995-09-01), Iwahashi et al.

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