Fairchild CTµL (Complementary Transistor MicroLogic) was one of the first IC logic families, dating from the mid-1960s, and is a form of non-saturating, current-mode logic, similar to ECL.
To quote from the Fairchild 1966 catalog:
Fairchild Complementary Transistor Micrologic integrated circuits were designed for very high-speed, low cost commercial systems applications. The logic form is AND-OR-NOT. All circuits have provisions for output OR ties.
ITT second-sourced some of these ICs, based on the observation of some ICs stamped with "ITT" on boards in an HP 2116C.
Source of Data, Key to Refs:
Period: Mid 1960s to early 1970s. The earliest direct reference is a Fairchild catalog from 1966. The HP 2116A was being designed at least as early as 1965. Additional devices show up in the HP 2100A, which was released in 1971.
Supply Voltages: Vcc = +4.5 V ±10%, Vee = -2V ±10%.
Technology: The diagram presents the basic schematic of CTµL AND and NOR gates. These are taken from the Fairchild 1966 catalog. Delay time is 3 nS for AND gates of this form, 9 nS for NOR gates.
Logic: Gate symbols are presented in accordance with
Packaging: Standard 14-pin DIP with some later devices in 16-pin DIP.
Note: IC packages as viewed from above.
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HP 21xx Series