ECL latch with single-ended and differential inputs

Details ECL latch with single-ended and differential inputs ECL latch with single-ended and differential inputs

1992-04-09

1993-01-05

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072722, 307443, H03K 19086

Patent

active

051773805

ABSTRACT:
An ECL circuit is capable of simultaneously responding to single-ended and differential inputs. The ECL circuit comprises a single-ended input, a differential input, logic responsive to the single-ended and differential inputs for determining a digital output state, and an output for communicating the output state to external devices. Each input, i.e., the single-ended input and the two complementary portions of the differential input, provide a base voltage for a control transistor. In order to allow the single-ended input to override the differential input, the differential input has half the voltage swing of the single-ended input and the high level of the differential input is halfway between the high and low levels of the single-ended input. In this way, an active single-ended input will exert more control over the current paths than the differential input. When the single-ended input is inactive, the differential input will exert control over the current paths.

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IBM Technical Disclosure Bulletin, vol. 32, No. 1, Jun. 1989, (New York, US), "Implementation of an Over-Writing ECL Logic", pp. 152-153.
Radio Fernsehen Elektronik, vol. 26, No. 1, Jan. 1977, M. Auer et al.: "Complexe ECL-Schaltkreise" pp. 10-24.

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