In the case of the open-collector output configuration, this “high” state was simply “floating.” In the single-input (inverter) circuit, grounding the input resulted in an output that assumed the “high” (1) state. This transistor has one collector, one base, and two emitters, and in the circuit, it looks like this: Unfortunately, a simple NPN transistor structure is inadequate to simulate the three PN junctions necessary in this diode network, so a different transistor (and symbol) is needed. Just as in the case of the inverter and buffer, the “steering” diode cluster marked “Q 1” is actually formed like a transistor, even though it isn’t used in any amplifying capacity. This schematic illustrates a real circuit, but it isn’t called a “two-input inverter.” Through analysis, we will discover what this Circuit’s logic function is and correspondingly what it should be designated as. Suppose we altered our basic open-collector inverter circuit, adding a second input terminal just like the first: Two Input Inverter Circuit
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