Additional characters in a part number identify the package and other variations. This part was made in various through-hole and surface-mount packages, including flat pack and plastic/ceramic dual in-line. Each gate uses two input pins and one output pin, with the remaining two pins being power (+5 V) and ground. The first part number in the series, the 7400, is a 14-pin IC containing four two-input NAND gates. Texas Instruments SN5451 in the original flat package The fastest types and very low voltage versions are typically surface-mount only, however. They are useful for rapid breadboard-prototyping and for education and remain available from most manufacturers. The original through-hole devices in dual in-line packages (DIP/DIL) were the mainstay of the industry for many decades. Today, surface-mounted CMOS versions of the 7400 series are used in various applications in electronics and for glue logic in computers and industrial electronics. Texas Instruments prefixes for TTL temperature ranges More recent TTL logic families were manufactured using CMOS or BiCMOS technology rather than TTL. Since the 1970s, new product families have been released to replace the original 7400 series. The less-common 64 and 84 prefixes on Texas Instruments parts indicated an industrial temperature range. These parts are prefixed with 54 instead of 74 in the part number. Some TTL logic parts were made with an extended military-specification temperature range. Specific functions are described in a list of 7400 series integrated circuits. The 7400 series contains hundreds of devices that provide everything from basic logic gates, flip-flops, and counters, to special purpose bus transceivers and arithmetic logic units (ALU). See also: Transistor–transistor logic § History Over the decades, many generations of pin-compatible descendant families evolved to include support for low power CMOS technology, lower supply voltages, and surface mount packages. A low-cost plastic package SN7400 series was introduced in 1966 which quickly gained over 50% of the logic chip market, and eventually becoming de facto standardized electronic components. In 1964, Texas Instruments introduced the SN5400 series of logic chips, in a ceramic semiconductor package. The 7400 series is a popular logic family of transistor–transistor logic (TTL) integrated circuits (ICs). The second line of numbers (7645) is a date code this chip was manufactured in the 45th week of 1976. The SN prefix indicates it was manufactured by Texas Instruments The N suffix is a vendor-specific code indicating plastic DIP packaging. The SN7400N chip contains four two-input NAND gates. For the military unit, see 7486th Air Defense Group.
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