HP 21xx - CTµL ICs

Fairchild CTµL Integrated Circuits

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.

Known Devices:

HP	Fairchild	F SL	Function	Refs
CTµL Integrated Circuits & Cross Reference
1820-0186	?	?	dual 2-in AND, dual resistors	B2,2100
1820-0187	?	?	dual 2-in NOR, dual resistors	B2,2100
1820-0482	?	?	binary to 1-of-8 decoder	2100
1820-0485	?	?	hex level restorer (2-in AND, quint 1-in)	2100
1820-0952	9952	SL3455	dual 2-in NOR	F66,B2,2100
1820-0953	9953	SL3456	dual 2-in AND, 3-in AND	F66,B2,2100
1820-0954	9954	?	dual 4-in AND	F66,B2,2100
1820-0955	9955	?	8-in AND	F66,B2,2100
1820-0956	9956	SL3459	dual 2-in AND Buffer	F66,B2,2100
1820-0957	9957	?	MS FF	F66,B2,2100
1820-0964	9964	?	dual 3-in AND, 1-in gate, OR'able	F66,B2,2100
1820-0965	9965	?	quad 1-in gate, OR'able	F66,B2,2100
1820-0966	9966	?	quad 2-in AND, 2 outputs ORed	F66,B2,2100
1820-0967	9967	?	JK FF	F66,B2,2100
1820-0968	9968	?	dual Latch	F66,B2,2100
1820-0971	9971	SL3467	quad 2-in AND, outputs ORed in 2 pairs	F66,B2,2100
1820-0972	?	?	dual 2-in NOR, dual resistors	2100
1820-0973	?	?	dual 2-in AND, 3-in AND	2100
1820-0974	?	?	dual 2-in AND, dual resistors	2100
1820-0975	?	?	JK FF (similar to -0967)	2100

Source of Data, Key to Refs:

F66: 1966 Fairchild catalog.
B2: Manual for 2116B, Vol. 2, Pg. A-08/504, 1970; from bitsavers.
2100: Drawings manual for 2100A, 1975; from bitsavers.
Physical ICs in a 2116C.

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

TRUE/1 = +? V
FALSE/0 = ? V

Packaging: Standard 14-pin DIP with some later devices in 16-pin DIP.

Note: IC packages as viewed from above.

bhilpert
Jan 2006