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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]
4-bit binary counter (separate divide-by-2 and divide-by-8 sections); different pinout for 74L93 14 SN74LS93: 74x94 1 4-bit shift register, dual asynchronous presets 16 SN7494: 74x95 1 4-bit shift register, parallel in, parallel out, serial input; different pinout for 74L95 14 SN74LS95B: 74x96 1
PCI Express connector pinout (x1, x4, x8 and x16 variants) Pin Side B Side A Description Pin Side B Side A Description 1 +12 V: PRSNT1# Must connect to farthest PRSNT2# pin 50 HSOp(8) Reserved: Lane 8 transmit data, + and − 2 +12 V +12 V: Main power pins 51 HSOn(8) Ground 3 +12 V +12 V 52 Ground: HSIp(8) Lane 8 receive data, + and − 4 ...
The codes given in the chart below usually tell the length and width of the components in tenths of millimeters or hundredths of inches. For example, a metric 2520 component is 2.5 mm by 2.0 mm which corresponds roughly to 0.10 inches by 0.08 inches (hence, imperial size is 1008).
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 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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