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The following is a list of 7400-series digital logic integrated circuits.In the mid-1960s, the original 7400-series integrated circuits were introduced by Texas Instruments with the prefix "SN" to create the name SN74xx.
Floppy drive connector pinout (host controller as a reference) Pin number Abbreviation Description Notes Type 2 DENSEL Density Select 1=Low/0=High: The default use is 0: Output 4 RSVD Reserved No connection or connect to the ground 6 RSVD Reserved No connection or connect to the ground 8 INDEX# Index 0=Index Input 10 MOTEA# Motor A Enable
The Soviet Union started manufacturing TTL ICs with 7400-series pinout in the late 1960s and early 1970s, such as the K155ЛA3, which was pin-compatible with the 7400 part available in the United States, except for using a metric spacing of 2.5 mm between pins instead of the 0.1 inches (2.54 mm) pin-to-pin spacing used in the west. [107]
The 7400 series devices have been produced on a number of different manufacturing processes, but have retained the same pinouts throughout. For example, all 7405 devices provide six NOT gates (or inverters) but may have incompatible supply voltage tolerances. 7405 – Standard TTL, 4.75–5.25 V. 74C05 – CMOS, 4–15 V.
Power-supply inputs on circuit boards with screen-printed voltage subscripts. IC power-supply pins are voltage and current supply terminals found on integrated circuits (ICs) in electrical engineering, electronic engineering, and integrated circuit design.
End-users and 3rd-party sellers on eBay often describe connectors by their wrong name thus perpetuating confusion of the exact series of a specific connector. It is very common in blogs and websites to incorrectly name a specific connector only by the name of the manufacturer.
The combinational logic circuitry of the 74181 integrated circuit. The 74181 is a 7400 series medium-scale integration (MSI) TTL integrated circuit, containing the equivalent of 75 logic gates [3] and most commonly packaged as a 24-pin DIP.
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