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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 ...
The following is a list of 7400-series digital logic integrated ... 8 8-bit Schottky diode bus termination array, clamp to GND ... 13-bit GTL to 3.3V TTL 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
In the later 8/S model, introduced in August 1966, [8] two different logic voltages increased the fan-out of the inexpensive diode–transistor logic. [20] The 8/S also reduced the number of logic gates by using a serial, single-bit-wide data path to do arithmetic. The CPU of the PDP-8/S has only about 519 logic gates.
[1] [2] In the same family are ULN2002A, ULN2004A, as well as ULQ2003A and ULQ2004A, designed for different logic input levels. The ULN2003A is also similar to the ULN2001A (4 inputs) and the ULN2801A, ULN2802A, ULN2803A, ULN2804A and ULN2805A, only differing in logic input levels ( TTL , CMOS , PMOS ) and number of in/outputs (4/7/8).