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Term
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Description
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| Telnet |
Abbreviated from Teletype Network. A networked terminal emulation protocol that provides transparent remote access to a server or device as though it were a local hardwired connection. |
| Thermocouple |
A temperature transducer made of two dissimilar metals welded together at one point to form a junction that, when heated in a complete circuit, generates a small voltage proportional to the junction temperature. |
| Three State |
An output from a logic device that can exist in one of three states; logic 0, logic 1, or a high-impedance (disconnected) state. This latter state allows multiple outputs to connect to one signal, effectively providing a "bus" that many signals can share. Three-state devices will provide an output-enable signal that either connects logic signals to the device’s outputs, or places the outputs in a high-impedance state. (National Semiconductor owns the trademark, "tristate™", although the term finds common use among designers.) |
| Transparent Latch |
A latch that passes signals from its inputs to its outputs as long as its Enable signal remains active—usually logic 1. When the Enable signal changes to its inactive state—usually a logic 0—the latch closes and then the outputs remain as they were when the Enable signal changed from logic 1 to logic 0. In effect, this IC acts like a small memory. |
| Triac |
A semiconductor switch that can control devices powered by AC current. |
| Truth Table |
A table that shows all possible input and output conditions for a logic element such as a gate or flip-flop. This table may show binary states as well as clock and signal transitions. |
| TTL |
Transistor-Transistor-Logic - The type of circuit used in the popular 7400 logic-device families. |
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