A TTL (Transistor Transistor Logic)circuit will "sink" current when the circuit is a a logic "0" (grd) and "source" current at a logic "1" (+5vdc).
[These terms are far more generally used than just in digital electronics. Indeed, they antedate digital electronics. They are used in thermodynamics, which originated in the 19th century. Would some physicist complete this article?]
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