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In the mid-1960s, the original 7400-series integrated circuits were introduced by Texas Instruments with the prefix "SN" to create the name SN74xx. Due to the popularity of these parts, other manufacturers released pin-to-pin compatible logic devices and kept the 7400 sequence number as an aid to identification of compatible parts. However ...
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 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. The 4-bit wide ALU can perform all the traditional add / subtract / decrement operations with or without carry, as well as AND / NAND, OR / NOR, XOR , and shift .
HCMOS ("high-speed CMOS") is the set of specifications for electrical ratings and characteristics, forming the 74HC00 family, a part of the 7400 series of integrated circuits. [ 1 ] The 74HC00 family followed, and improved upon, the 74C00 series (which provided an alternative CMOS logic family to the 4000 series but retained the part number ...
IC No. (7400) IC No. (4000) Function Output State 74x139 Dual 1:4 demux. Output is inverted input 74x156 Dual 1:4 demux. Output is open collector: 74x138 1:8 demux. Output is inverted input 74x238 1:8 demux. 74x154 1:16 demux. Output is inverted input 74x159 CD4514/15 1:16 demux. Output is open collector and same as input
XNOR gates are represented in most TTL and CMOS IC families. The standard 4000 series CMOS IC is the 4077, and the TTL IC is the 74266 (although an open-collector implementation). Both include four independent, two-input, XNOR gates. The (now obsolete) 74S135 implemented four two-input XOR/XNOR gates or two three-input XNOR gates.
The following 7400 series devices include a Schmitt trigger on their input(s): (see List of 7400-series integrated circuits) 7413: Dual Schmitt trigger 4-input NAND Gate; 7414: Hex Schmitt trigger Inverter; 7418: Dual Schmitt trigger 4-input NAND Gate; 7419: Hex Schmitt trigger Inverter; 74121: Monostable Multivibrator with Schmitt Trigger Inputs
Real world examples of an 3-3 AOI gate is found in the SN74LS51 logic IC (see further below). [4] The 3-3 AOI gate can be represented by the following boolean equation and truth table: = () ¯. Its logic table would have 64 entries, but is not shown.