Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

1990-03-01

1991-08-06

Hille, Rolf

Static information storage and retrieval

Magnetic bubbles

Guide structure

365177, 365159, 307446, H01L 2972, G11C 1134

Patent

active

050381911

ABSTRACT:
A semiconductor memory device comprises a memory array including a plurality of memory cells arranged in a matrix form, a plurality of word lines arranged in column and a plurality of bit lines arranged in row. Each memory cell includes a bipolar transistor in which a collector-emitter voltage is controlled so that the polarity of a base current changes is changed in accordance with an increase in a base-emitter voltage, and a switching element, provided between the base of the bipolar transistor and an associated bit line and controllable by an associated word line. A switch circuit is provided for applying a collector voltage to the collector of the bipolar transistor smaller in a second state where an associated one of the memory cells is holding data than in a second state where the associated memory cell is accessible for data reading and data writing.

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patent: 4849934 (1989-07-01), Yokoyama et al.
patent: 4882534 (1989-11-01), Koshizuka

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