Browse Prior Art Database

Random Access Memory Cell

IP.com Disclosure Number: IPCOM000075734D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Wiedmann, SK: AUTHOR

Abstract

This storage cell consumes very little power and uses very little chip area.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 69% of the total text.

Page 1 of 2

Random Access Memory Cell

This storage cell consumes very little power and uses very little chip area.

Transistors T1 and T2 form a cross-connected pair which with load transistors T3 and T4 form a bistable circuit. With transistor T2 conducting a "0" is stored in the bistable circuit and with transistor T1 conducting a "1" is stored in the bistable circuit.

Writing data into the cell is performed by applying a negative pulse to the X-address line 10, while simultaneously applying a positive pulse to either the B0 or B1 bit line 14 or 16. If a 0 is to be stored in the cell the pulse is applied to the B0 bit line 14 turning on transistor T8 and shunting transistor T1 off so that transistor T1 is held off to permit transistor T2 to conduct.

Alternatively, to write a 1 into the cell, a pulse is supplied to the B1 bit line 16 the same time the X-address line 10 is addressed. Here transistor T7 performs the function of shunting the transistor T2 to hold it off so that transistor T1 conducts.

The cell current of the unaddressed cells is turned off during the write operation by the reduction of voltage on the Y-address line 18 for the nonaddressed cells. The data in those cells is maintained by the cell interelectrode capacitance so that no disturb condition occurs in the unselected cells.

For reading, the cell is addressed by the application of a negative pulse to the X-address line 10. If a 0 is stored in the cell transistor T6 will conduct causing the current to be d...