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legal form Corporation
ISIN US9895243015
founding 1974
Seat San Jose , United States
Branch Microprocessor manufacturer

Zilog , also ZiLOG written is an American designer and manufacturer of 8-bit - microprocessors , based in San Jose , California . The best-known product is the Intel 8080 compatible, but more powerful Z80 from 1976.


Zilog was founded in 1974 by Federico Faggin , the former Intel chief architect of the 8-bit microprocessor 8080. Faggin used his experience with the Intel 8080 for the forward compatible development of the Z80.

Later, Zilog also introduced further developments to 16-bit (Z8000) and 32-bit (Z80000) processors. Due to the lack of success with these series, the company subsequently concentrated on microcontrollers . In addition to processors, Zilog also developed a number of other components (called SIO for serial input / output, PIO for parallel I / O, etc.). The best known is probably the serial controller Z8530, as it was used in Sun SPARCstations and SPARCserver up to the SPARCstation 20 .

In addition, Zilog manufactures a number of special controllers. Including Zilog Crimzon for infrared transmission tasks , digital signal processors, serial communication controllers (SCC), TV controllers and controllers for radio remote controls.

Zilog was acquired by Exxon in 1980 . Nine years later (1989) management and employees bought the company back. In 1990 the company went public.

In the German Democratic Republic , many Zilog processors and peripheral circuits were reproduced without a license (Z80 PIO as U855; Z80 SIO as U856; Z80 CTC as U857; Z80 DMA as U858; Z80 as U880 ; Z8 as U881 / U882 / U883; Z8000 as U8000). The U880 was the standard processor par excellence in the GDR, which was used almost everywhere from home computers to machine control.

In 1998, Zilog was taken over by the Texas Pacific Group . After the collapse of chip prices, Zilog was restructured in 2001 as part of bankruptcy proceedings. In February 2008, Zilog rejected a takeover offer from Universal Electronics Inc. In December 2009, IXYS offered to integrate Zilog into its own company for a price of US $ 62.4 million - roughly equivalent to the market value at that time. The takeover was approved by the Annual General Meeting on February 18, 2010 .


One of the first Z80 microprocessors in a ceramic case from 1976

Known Zilog processors are u. a .:

New processor / controller lines are:

  • Zilog eZ80Acclaim! with extended Z80 architecture ( acclaim = high praise)
  • Zilog Z8Encore! with extended Z8 architecture ( encore = addition)
  • Zilog ZNEO as the first 16-bit microcontroller with numerous integrated functions
  • Zilog Zatara ASSP as the first 32-bit microcontroller based on an ARM9 processor core

Individual evidence

  1. Andreas Stiller: 40 years 8086: the processor that changed the PC world. In: Heise online . June 8, 2018, accessed May 23, 2020 .
  2. Markt & Technik ( Memento of the original dated December 12, 2009 in the Internet Archive ) Info: The archive link was inserted automatically and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. . Issue No. 51/52 2009 of December 18, 2009 p. 8.  @1@ 2Template: Webachiv / IABot /
  3. ^ Acquisition of Zilog by IXYS Corporation. In: February 18, 2010, accessed on August 27, 2011 (press release).

Web links

Commons : ZiLOG microprocessors  - collection of images, videos and audio files