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Term
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Description
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| 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. |
| UART |
Universal Asynchronous Receiver Transmitter - the chip that enables serial communications between the COM port and other serial devices. |
| VA |
Volt-Ampere - The unit of apparent power in an AC circuit containing capacitive or inductive reactance. The apparent power is the product of source voltage and current. |
| VCC |
The symbol for the positive supply voltage in a circuit. Also noted as Vcc. |
| VGA |
Acronym for Video Graphics Array. 1) An analog video display standard. 2) A DB-15 video connector. 3) An analog video resolution of 640 x 480 pixels. |
| Volt |
The unit of potential difference or electromotive force, abbreviated V. One volt represents the potential difference needed to produce one ampere of current through a resistance of one ohm. |
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