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PPS-25 - Fairchild
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Fairchild PPS-25
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Developer Fairchild Semiconductor
Manufacturer Fairchild Semiconductor
Type microprocessors
Production 1971
Architecture 4-bit
Word size 4 bit
0.5 octets
1 nibbles
Technology pMOS
Clock 400 kHz
Package DIP40

The PPS-25 (also PPS25) was a family of 4-bit multi-chip microprocessor developed by Fairchild and released in 1971/2. While there is no definitive starting production date available, there is evidence pointing to early 1971/2 (some early books placing it ahead of the 4004)[1]. This family was very short-lived as within a few years, Fairchild shifted their effort toward more advanced designs such as their macrologic families 4700/9400 and what became their flagship product, the F8.

Book icon.png Help! This article is about the Fairchild PPS-25 family that has lost in the mists of time. Please help use restore and preserve this info! If you have more information pertaining to this chip please consider editing this page or posting that info on its discussion page (e.g. datasheet, manuals, catalogs, or any other literature on the subject would be help greatly).


Family Members
Part Description
3805 ALU[2]
3806 Control and timing unit


  1. Jack Belzer, Albert G. Holzman, Allen Kent (Jul 1, 1978). Encyclopedia of Computer Science and Technology: Volume 10 - Linear and Matrix Algebra to Microorganisms: Computer-Assisted Identification. page 401
  2. Electronic & Power 17 May 1973

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Facts about "PPS-25 - Fairchild"
designerFairchild Semiconductor +
full page namefairchild/pps-25 +
instance ofmicroprocessor family +
main designerFairchild Semiconductor +
manufacturerFairchild Semiconductor +
nameFairchild PPS-25 +
packageDIP40 +
technologypMOS +
word size4 bit (0.5 octets, 1 nibbles) +