Semiconductor integrated circuit device including an array of in

Details Semiconductor integrated circuit device including an array of in Semiconductor integrated circuit device including an array of in

1975-08-04

1977-08-30

Wojciechowicz, Edward J.

357 45, H01L 2702, H01L 2710

Patent

active

040458113

ABSTRACT:
A monolithic array of insulated gate field effect transistors useful, for example, as a read-only memory, has means for defining a pre-selected array of operative and non-operative transistors in a row and column arrangement. Non-operative transistors include diffused regions lying in the conductive channel zones thereof which serve to raise the value of the threshold voltage of these transistors above a value normally applied to the gate electrodes of all the transistors in the operation of the device. Operative transistors have no such threshold-raising diffused regions in their channel zones so that they can be turned on by the normally applied voltage. The array is programmable by means of a single photomask.

REFERENCES:
patent: 3665473 (1972-05-01), Heimbigner
patent: 3740732 (1973-06-01), Frandon

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