Reference setting circuit for determining written-in content in

Details Reference setting circuit for determining written-in content in Reference setting circuit for determining written-in content in

1988-05-23

1990-08-21

Fears, Terrell W.

Static information storage and retrieval

Read/write circuit

Differential sensing

36518905, 36518909, 36523008, G11C 1140, G11C 1300

Patent

active

049512579

ABSTRACT:
A nonvolatile semiconductor memory according to this invention is so constructed that different data readout references are used in an ordinary readout mode and in a program verification mode. The different read-out references can be set by changing reference input potential VREF supplied to a differential sense amplifier for amplifying a potential derived onto a bit line from a memory cell, or by changing an input threshold level of a circuit for sensing the potential on the bit line. In this case, the readout reference in the program verification mode is set severe, or high, in comparison with that in the ordinary readout mode.

REFERENCES:
patent: 4223394 (1980-09-01), Pathak et al.

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