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100K - Fairchild
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Fairchild 100K
Developer Fairchild
Manufacturer Fairchild
Type Discrete Logic
Introduction 1973 (launch)
Technology ECL

Fairchild 100K (F-100K; 100xxx) was a family of very high-speed discrete logic chips and 8-bit bit-slice chips introduced by Fairchild Semiconductor in the early-1970s but did not reach high availability until the later part of the decade. This series was implemented using emitter-coupled logic (ECL) making those chips considerably faster than comparable Schottky TTL-based chips. The 100K family were an improved version of the 10K which was originally introduced by Motorola and was later also manufactured by Fairchild. Many early high-speed systems and supercomputers made use of those chips.


In the mid-1970s Fairchild introduced the 100K which was an improved version of the original 10K family. The new family had a lower supply voltage of around ~4.5 V from 5.2 V as well as considerably faster propagation delay (e.g., down to 0.75ns from 2ns). Additionally, the 100K family made use of a larger package (DIP-24 vs DIP-16 for most components).

100K-based parts found their way into many early high-performance systems. For example, the Floating Point Systems FPS-264 64-bit floating-point co-processor which was introduced in February 1985 performed 4 to 5 times faster than its predecessor, FPS-164, by simply switching to 100K series ECL chips from Schottky TTL; this was all done without making any architectural changes and maintaining 100% software compatibility.

Making use of ECL meant system designers were confronted with high power consumption which reduced the usefulness of those chips. It's part of the reason why most systems that used those chips only used them where high speed was vitality needed and even then expensive special cooling was often needed.

Second source[edit]

Second Source Country
Signetics United States
Radiotechnique-Compelec (RTC) France
Hitachi Japan


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Bit-slice parts[edit]

See also: bit-slice microprocessor and F220

In April 1980 Fairchild introduced an expansion to the standard discrete logic chips, the F220 (10022x) series of micro-programmed 8-bit bit-slice chips. The sub-family was composed of 5 chips featuring 1,000-gate density and sub-nanosecond delays.

Part Description
100220 Address and Data Interface Unit (ADIU)
100221 Multi-Function Network (MFN)
100222 Dual Access Stack (DAS)
100223 Programmable Interface Unit (PIU)
100224 Microprogram Sequencer (MPS)


This list is incomplete; you can help by expanding it.


See also[edit]

Facts about "100K - Fairchild"
designerFairchild +
first launched1973 +
full page namefairchild/100k +
instance ofintegrated circuit family +
main designerFairchild +
manufacturerFairchild +
nameFairchild 100K +
technologyECL +