26-01-2017 дата публикации
Номер: US20170025163A1
Принадлежит:
A volatile memory array using vertical thyristors is disclosed together with methods of operating the array to read, write, retain and refresh data stored therein. 1. A method of operating a volatile memory array having anode lines , cathode lines , and an array of vertical thyristors having anodes coupled to the anode lines and having cathodes coupled to the cathode lines , the method to retain stored data in all of the thyristors comprising:applying to all anode lines a first potential;applying to all cathode lines a second potential; whereinthe difference between the first and second potentials is sufficient to keep thyristors which are on turned on.2. A method as in wherein:the first potential is about 0.5-0.7 volts; andthe second potential is about 0.0 volts. This patent application is a divisional of U.S. patent application Ser. No. 14/841,140, filed Aug. 31, 2015, which is related to U.S. patent application Ser. No. 14/841,140, filed of even date and entitled, “Thyristor Volatile Random Access Memory and Methods of Manufacture,” U.S. patent application Ser. No. 14/841,521, filed of even date and entitled, “Methods of Reading and Writing Data in a Thyristor Random Access Memory,” U.S. patent application Ser. No. 14/841,615, filed of even date and entitled, “Power Reduction in Thyristor Random Access Memory;” all of which claim priority from U.S. Provisional Patent No. 62/186,336, filed Jun. 29, 2015, and entitled, “High-Density Volatile RAMs, Method of Operation and Manufacture Thereof,” and is a continuation-in-part of U.S. application Ser. No. 14/590,834, filed Jan. 6, 2015 and entitled, “Cross-Coupled Thyristor SRAM Circuits and Methods of Operation,” which claims priority from U.S. Provisional Patent Application No. 62/055,582, filed Sep. 25, 2014; all of which are incorporated by reference herein for all purposes.This invention is related to integrated circuit devices and in particular to volatile random access memories, commonly known as dynamic random ...
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