The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 1988
Filed:
Feb. 14, 1986
Shigeki Matsuoka, Suita, JP;
Satoshi Kono, Toyonaka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A system and method for programming an EPROM which includes a bit line, a plurality of memory cell MOS transistors connected to the bit line, a switching transistor for selectively applying a programming voltage to the bit line, and a selection circuit for selecting one of the memory transistors for programming. In accordance with the principle of the present invention, when one of the memory transistors is selected for programming, the programming voltage is applied to the bit line and thus to the drain of the selected memory transistor and to the gate of the selected memory transistor. Then, even after termination of application of the programming voltage to the bit line, the programming voltage remains to be applied to the gate for a predetermined time period, thereby allowing charge stored in the parasitic capacitance of the bit line to be completely discharged through the selected transistor.