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Glossary

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Term Description
Latch A logic circuit that takes a "snapshot" of information and saves it. Latches operate using an edge-triggered or a level-triggered control signal.
LED Light-Emitting Diode. A diode that emits light when current passes through it (forward biased). LEDs provide white light as well as most colors. LEDs usually require an external current-limiting resistor.
Logic Ground A ground-reference point in a circuit for all logic signals. Usually kept separate from other grounds in a system due to noise concerns.
Logical AND A Boolean-logic operation that produces a true output only when all the function or circuit inputs exist in the true state.
Logical NOT The equivalent of an inversion operation, usually applied as part of another logic element or operation. See: Inverter.
Logical OR A Boolean-logic operation that produces a false output only when all the function or circuit inputs exist in the false state.
Low Impedance A low-resistance circuit that usually requires high current to drive it, as opposed to a high-impedance circuit.
Low Side Switch A switch that makes a connection directly to ground.
LVDS Acronym for Low Voltage, Differential Signaling. A low power, high-speed differential signaling system primarily used to transmit video, but can be used for transmitting other forms of data.
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