Patent · US Expired

Integrated circuit of the logic circuit type comprising an electrically programmable non-volatile memory

US4837744A · kind A · utility

25Cited by
2References
8Claims
0Family size

Assignee

Inventor

Key dates

Filing dateNov 4, 1987
Grant dateJun 6, 1989
Priority date—
Expiry dateNov 4, 2007

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG11C16/32
  • WIPO fieldControl
  • WIPO sectorInstruments

Abstract

An integrated circuit of the logic circuit type includes a matrix of memory cells of the floating-gate transistor type, write and read circuits and circuitry to handle the interconnection of these circuits with the memory. The integrated circuit receives a general supply voltage Vcc, a programming voltage Vpp and an external clock signal divided into two complementary clock signals. The clock signals acts on, among others, the functioning of the write circuits. The integrated circuit further includes a circuit to detect the presence of internal clock signals. The circuit sends a signal prohibiting write operations in the memory when it detects the absence of one of the internal clock signals.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.