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Some TTL logic parts were made with an extended military-specification temperature range. These parts are prefixed with 54 instead of 74 in the part number. [1]A short-lived 64 prefix on Texas Instruments parts indicated an industrial temperature range; this prefix had been dropped from the TI literature by 1973.
Manufacturer's data sheets: Texas Instruments (and 74182 look-ahead carry generator) Signetics; Philips; Fairchild. Explanation of how the chip works. Inside the vintage 74181 ALU chip: how it works and why it's so strange; Inside the 74181 ALU chip: die photos and reverse engineering showing its floorplan and transistor layout of some of its gates
The first part number in the series, the 7400, is a 14-pin IC containing four two-input NAND gates. Each gate uses two input pins and one output pin, with the remaining two pins being power (+5 V) and ground. This part was made in various through-hole and surface-mount packages, including flat pack and plastic/ceramic dual in-line.
Transistor-level schematic for a 741 op-amp. datasheet, datasheet. Source: User:Vadmium: Author: Omegatron. Hand-crafted by User:Vadmium in a text editor, as an SVG replacement for Image:Opamptransistorlevel.png. Permission (Reusing this file)
Research and industry in this specialty continues to grow and prosper. Some examples of long-lived and well-known analog chips are the 741 operational amplifier, and the 555 timer IC. Power supply chips are also considered to be analog chips. Their main purpose is to produce a well-regulated output voltage supply for other chips in the system.
A pinout diagram of the LM741 operational amplifier when in a square IC package (DIP or SOIC, as opposed to "tin can" packages). Date: 22 January 2008: Source: Self-made, Inkscape: Author: Inductiveload: Permission (Reusing this file)
English: Transistor-level schematic for a 741 op-amp, color coded and labeled. Dotted lines outline: current mirrors (red); differential amplifier (blue); class A gain stage (magenta); voltage level shifter (green); output stage (cyan).
A reference designator unambiguously identifies the location of a component within an electrical schematic or on a printed circuit board.The reference designator usually consists of one or two letters followed by a number, e.g. C3, D1, R4, U15.