![]() ![]() Thus, a 1 in resulted in a 0 out, and vice versa. In the case of the open-collector output configuration, this “high” state was simply “floating.”Īllowing the input to float (or be connected to Vcc) resulted in the output becoming grounded, which is the “low” or 0 state. 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 “Q1” 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: ![]()
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