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:
Sep. 30, 1986
Filed:
Dec. 06, 1983
Darrell D Rinerson, Santa Cruz, CA (US);
Patrick T Chuang, Cupertino, CA (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
A nonvolatile dynamic RAM capable of operating in a dynamic RAM mode and a second, nonvolatile mode, is disclosed. The nonvolatile dynamic RAM has a memory cell having a transfer transistor for coupling a storage capacitor having a floating gate to a bit line. The memory cell holds information by the storage of charge in the storage capacitor and also holds information by the storage of charge in the floating gate. This data can be stored and retrieved in a volatile mode and in a nonvolatile mode. The nonvolatile dynamic RAM has a plurality of these memory cells connected to a bit line which, in turn, is connected to a sense amplifier for determining the presence or absence of storage charges in the storage capacitor of a selected memory cell in the first mode, and for determining the presence or absence of storage charges in the floating gate of the selected memory cell in the second mode.