Logic circuits incorporating a dual function input
 A dual function capability is incorporated into one input of an emitter coupled logic gate to allow a user to selectively enable the logic circuit to operate in a multifunction mode. The dual function input can recognize both normal binary voltage levels and operate as a conventional input for digital information, and also recognize voltage levels not within the normal binary voltage levels and modify the circuit function correspondingly. 
Motorola, Inc.
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inventional inventional inventional
Marvin A. Jack L. Frank J.
Glazer Anderson Swiatowiecz