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Zilog, Inc., previously known as ZiLOG, is an American manufacturer of 8-bit and 16-bit microcontrollers. Its most famous product is the Z80 series, 8-bit microprocessors that were compatible with the Intel 8080 but far less expensive. The Z80 was widely used during the 1980s in many popular home computers such as the TRS-80 and the ZX81. 16 and 32-bit processors were also produced by the company, but these did not see widespread use. From the 1990s the company focused primarily on the microcontroller market. The name is an acronym for "Z (the last word in) integrated logic".〔(Zilog Oral History Panel on the Founding of the Company and the Development of the Z80 Microprocessor )〕 ==History== Zilog was started in California in 1974 by Federico Faggin and (Ralph Ungermann ),〔http://archive.computerhistory.org/resources/text/Oral_History/Zilog_Z80/102658073.05.01.pdf〕 who both left Intel after working on the 4004 and 8080 microprocessors and custom chips. Masatoshi Shima, who also worked with Faggin on the 4004 and 8080, joined Zilog in 1975. Ungermann had a falling out with Faggin and left Zilog in 1978. The company became a subsidiary of Exxon in 1980, but the management and employees bought it back in 1989, led by Dr. Edgar Sack. Zilog went public in 1991, but was acquired in 1998 by Texas Pacific Group. Curtis Crawford replaced Dr. Sack and changed the company's direction towards 32-bit Data Communications Processors. Bonds were sold against the company to fund the new developments, but after the Internet bubble burst in 2000 and the resultant reduction in customer demand for such products, Curtis Crawford was replaced by James (Jim) Thorburn, who reorganized the company under Chapter 11 bankruptcy in late 2001 and refocused it back to the 8- and 16-bit microcontroller market. Jim Thorburn led Zilog back into profitability, and by FY 2007, Zilog had $82 million in sales. During this time, the company developed the Z8 Encore! 8-bit Flash MCU and ZNEO 16-bit Flash MCU product families. In February 2007, Zilog hired Darin Billerbeck to replace Jim Thorburn as President and CEO. 2007 was the last year Zilog introduced any new 8-bit microcontroller products. With no new product roadmap, FY2008 sales fell 20% to $67.2 million. Sales fell 46% in FY2009 to $36.2 million. In January 2008, Zilog declined an unsolicited proposal made by Universal Electronics Inc. to acquire the company.〔(Zilog Press Release (February 4, 2008): "Zilog Board of Directors Declines Universal Electronics Inc.'s Unsolicited Proposal" )〕 On February 19, 2009, Zilog announced that it had sold off its 8-bit Crimzon Universal Remote Control infrared microcontroller product line, as well as its ARM9 32-bit microcontrollers, including the Zatara security microcontrollers and 15 patents, to Maxim Integrated Products. Remote control manufacturer Universal Electronics Inc. purchased all of Zilog's software & IP assets related to Zilog's universal remote control business, including all ROM code, software, and database of infrared codes.〔(Zilog Sells Off Two Product Lines (February 19, 2009) )〕 Zilog sold these assets for $31 million cash. In December 2009, IXYS Corporation bought the company for $62.4m in cash, which was significantly below the market valuation of Zilog's stock at the time.〔(SEC filing: IXYS and Zilog merger )〕〔(Zilog Acquired by IXYS )〕 Details of the acquisition have been under investigation. Since early 2010, Zilog has refocused its efforts toward satisfying the industrial and consumer markets for motion detection, motor control, RF wireless and embedded security applications, and is currently producing a number of reference designs that integrate its 8- and 16-bit microcontrollers with IXYS power management products. In February 2012, Zilog announced the release of its Z8051 family of microcontrollers and toolsets to fill a vacancy in the developer market for 8051 cores that was created when chip-maker NXP exited the 8051 market. Later that year, Zilog announced its ZGATE Embedded Security solution, which incorporates its eZ80F91 MCU and TCP/IP stack with an embedded firewall to offer protection against cyber threats and attacks at the chip level. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Zilog」の詳細全文を読む スポンサード リンク
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