David J Mccall

US Patent:

47854227, Nov 15, 1988

Filed:

Sep 15, 1986

Appl. No.:

6/907757

Inventors:

Dale F. Berndt - Plymouth MN
David L. McCall - Lake Elmo MN
Thomas R. Arneberg - Woodland Park CO

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G11C 1134
G11C 700
G11C 702

US Classification:

365242

Abstract:

An alpha particle resistant memory cell and array with complementary, differential data in, data out and write enable inputs capable of independent, simultaneous read/write operations. During write operations, clocked differential write and data inputs steer cell current to induce differential cell voltages indicative of the stored data. During read operations, a read select input shifts the voltage levels of the selected cell to produce a distinguishable output which dominates over the other cells to appropriately steer current at a sense amplifier to identify the binary cell contents. A 64 row by 12 bit register stack, with split word write, master reset and read enable is also disclosed.