Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Nonvolatile semiconductor memory device










Image Number 3 for United States Patent #4813018.

A nonvolatile semiconductor memory device comprises a random access memory (RAM) and an electrically programmable and erasable read only memory (EEPROM). Since a capacitance (106) is formed between a control gate (103) and a drain (102) of a memory transistor, and a source of the memory transistor is rendered to be floating in the RAM write and read operation and in the EEPROM write operation and is supplied with a finite potential in EEPROM read operation, the operation of nonvolatile memory is achieved. A sense amplifier (15, 16) is amplified the potential difference between a bit line (BL) and a control gate line (CGL) is both memory operation and latches the input data in both write operation, such that the potential of the BL and the CGL are determined low or high potential. Besides in the EEPROM write operation, after latching the input data in the sense amplifier, a nonvolatile program is started such that a BL or a CGL is pumped up to program voltage (15-20 V). In the EEPROM read operation, a BL and a CGL are pre-changed in a different potential (BL<CGL) after equalizing in a same potential (BL=CGL), then the source of memory transistor is supplied with a fininte potential. Therefore, when the EEPROM transistor is conductive, is programmed "0", a BL is pre-charged more than a CGL potential (BL>CGL). After that, the sense amplifier is activated and the EEPROM data is read out.








 
 
  Recently Added Patents
Multiple secure elements in mobile electronic device with near field communication capability
Location-type tagging using collected traveler data
Methods and apparatus for performing multiple photoresist layer development and etching processes
Use of cocoa extract
Display apparatus
Data architecture and user interface for plasma processing related software applications
Sock
  Randomly Featured Patents
Compliant gear assembly, engine and gear train operating method
Flexible exhaust coupling with gasket crush reducing resilient members
Pneumatic tire
Bag
Synthesis of nicotine derivatives from nicotine
Heat fixing roll for electrophotographic duplicators
Boiling pot
DC-DC converter, liquid crystal display device, aging test apparatus of liquid crystal display device, and method thereof
Early primitive assembly and screen-space culling for multiple chip graphics system
Time keeping and recording device