Browse Prior Art Database

Monolithic Dual Emitter SCR Random Access Memory Cell

IP.com Disclosure Number: IPCOM000073891D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Chin, WB: AUTHOR

Abstract

The use of diodes D1 and D2 prevents disturb conditions on other Silicon Controlled Rectifier (SCR) cells coupled to the same line while respectively writing a "0" and "1" into the cell. To write a "1" into a cell the word bottom line 10 is lowered simultaneously with the raising of the bit 1 line 12 to turn on the SCR. To write a "0" into the cell, the bit 0 line 14 is increased while the word top line 16 is decreased to turn off the SCR. To read the data stored in the cell, the word bottom line 10 is initially pulsed down while the sense line 18 is lowered. Thereafter, the word bottom line 10 is temporarily raised diverting the current normally flowing to the word bottom line 10 to the sense line 18, thereby providing a pulsed signal on the sense line. If this pulsed signal is an up signal a "1" is stored in the cell.

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Monolithic Dual Emitter SCR Random Access Memory Cell

The use of diodes D1 and D2 prevents disturb conditions on other Silicon Controlled Rectifier (SCR) cells coupled to the same line while respectively writing a "0" and "1" into the cell. To write a "1" into a cell the word bottom line 10 is lowered simultaneously with the raising of the bit 1 line 12 to turn on the SCR. To write a "0" into the cell, the bit 0 line 14 is increased while the word top line 16 is decreased to turn off the SCR. To read the data stored in the cell, the word bottom line 10 is initially pulsed down while the sense line 18 is lowered. Thereafter, the word bottom line 10 is temporarily raised diverting the current normally flowing to the word bottom line 10 to the sense line 18, thereby providing a pulsed signal on the sense line. If this pulsed signal is an up signal a "1" is stored in the cell. If it is a down signal a "0" is stored in the cell.

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