The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 1986
Filed:
Jun. 30, 1983
John E Andersen, LaGrangeville, NY (US);
Joseph A Petrosky, LaGrangeville, NY (US);
Benedicto U Messina, Poughkeepsie, NY (US);
William D Silkman, Hopewell Junction, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A directory memory system having simultaneous writing and bypass capabilities. A data output bit from a respective memory cell of a memory array is applied to a control input of a first differential amplifier, while comparison input data is applied to inputs of a second differential amplifier. The outputs of corresponding transistors of the two differential amplifiers are connected together. Current switch transistors, operated in response to a bypass select signal, supply current only to one or the other of the two differential amplifiers. The differential output signal produced across the commonly connected outputs of the two differential amplifier circuits is buffered and amplified with a push-pull output circuit.