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The following diode logic gates work in both active-high or active-low logic, however the logical function they implement is different depending on what voltage level is considered active. Switching between active-high and active-low is commonly used to achieve a more efficient logic design.
Diode–transistor logic (DTL) is a class of digital circuits that is the direct ancestor of transistor–transistor logic. It is called so because the logic gating functions AND and OR are performed by diode logic , while logical inversion (NOT) and amplification (providing signal restoration) is performed by a transistor (in contrast with ...
Diode–transistor logic (DTL) was used in the IBM 608 which was the first all-transistorized computer. Early transistorized computers were implemented using discrete transistors, resistors, diodes and capacitors. The first diode–transistor logic family of integrated circuits was introduced by Signetics in 1962.
Diode logic: DL: Tunnel diode logic: TDL: Exactly the same as diode logic but can perform at a higher speed. [failed verification] Neon logic: NL: Uses neon bulbs or 3-element neon trigger tubes to perform logic. Core diode logic: CDL: Performed by semiconductor diodes and small ferrite toroidal cores for moderate speed and moderate power level ...
High-threshold logic (HTL), also known as low-speed logic (LSL) or high-level logic (HLL), is a variant of diode–transistor logic used in environments where noise is very high. FZH251, four two-input HTL AND
A level shifter connects one digital circuit that uses one logic level to another digital circuit that uses another logic level. Often two level shifters are used, one at each system: A line driver converts from internal logic levels to standard interface line levels; a line receiver converts from interface levels to internal voltage levels.
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A wired logic connection is a logic gate that implements boolean algebra (logic) using only passive components such as diodes and resistors. A wired logic connection can create an AND or an OR gate. Limitations include the inability to create a NOT gate, the lack of amplification to provide level restoration, and its constant ohmic heating for ...
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