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Differential current switch—High performance at low power

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2 Author(s)
Eichelberger, E.B. ; IBM Data Systems Division, Neighborhood Road, Kingston, New York 12401, USA ; Bello, S.E.

The recent IBM System/390™ announcement includes six high-performance air-cooled models that use a low-power variation of emitter-coupled logic (ECL). This new logic family, called differential current switch (DCS), uses differential signal pairs to represent logic signals, and combines two-level cascode logic with dotting to implement a complete set of logic circuits. These DCS circuits are described in detail, and the relative value of the DCS and ECL logic families is discussed extensively.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:35 ,  Issue: 3 )