series parts have the advantage of lower power consumption, wider
range of supply voltages (3 V to 15 V), and simpler circuit design
due to the vastly increased fan out. However their slower speed
(initially about 1 MHz operation, compared with bipolar TTL's 10 MHz)
limits their applications to static or slow speed designs.
7400 series of transistor–transistor logic (TTL) integrated
circuits are the most popular family of TTL integrated circuit logic
. 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).