Digital Logic ICs: PART2-The '74'-Series of Digital ICs

摘要

Ray Marston takes a deeper look at the '74'-series of digital ICs, and at various sub-members of its TTL and CMOS families, in this installment. Modern digital electronics are dominated by two major logic IC families: the low-speed '4000-series' of CMOS ICs and the '74-series' of fast TTL and CMOS ICs. The 74 family was originally based entirely on TTL technology, which first hit the electronics scene in a big way around 1972, when the 74-series suddenly arrived in the form of an entire range of versatile and cleverly conceived TTL digital logic ICs that were each designed to operate from a single-ended five-volt supply and to directly and easily interconnect with each other without hassle (each output could directly drive several inputs).