Speed, cost, and density advantages establish Transistor Transistor Logic (TTL) ICs as the most popular standard logic building blocks of the 1960s and 70s.

Integrated versions of discrete diode transistor logic (DTL) circuits became the first high-volume IC families. Designed by Orville Baker in 1962, the Signetics" SE100 Series DTL was overtaken in 1964 by the better noise immunity and lower cost of Fairchild"s 930 Series.

Patented by James Buie of Pacific Semiconductor in 1961, TTL (Transistor Transistor Logic) emerged as the most popular logic configuration of the next two decades. Unaware of Buie"s work but inspired by an "all transistor" logic circuit described by Ruegg and Beeson of Fairchild, Thomas Longo led the design of the first TTL family, Sylvania Universal High-level Logic (SUHL) in 1963. Encouraged by SUHL"s success in winning a high-profile Hughes military design (the Phoenix missile), TI introduced the competing SN5400 Series TTL family the following year. The company announced the SN7400 Series in low cost plastic packages for industrial customers in 1966 and quickly gained a greater than 50% share of the logic market.

By 1968 lithography advances significantly increased the number of transistors that could be integrated on a chip. Eager to win a share of the TTL business, Fairchild (9300 Series) and Signetics (8200 Series) pioneered the design of TTL-MSI (Medium Scale Integration - up to 100 logic gates per chip) functions such as counters, shift registers, and arithmetic logic units. Many vendors applied Schottky (1969 Milestone) and CMOS (1963 Milestone) technology to build larger, faster, and lower power TTL-compatible functions that extended the useful life and range of applications of this popular logic configuration.