|
HCMOS, ''high-speed CMOS'', is the set of specifications for electrical ratings and characteristics, forming the 74HC00 family, a part of the 7400 series of integrated circuits.〔(HCMOS family characteristics ), Philips Semiconductors, March 1988〕 The 74HC00 family followed, and improved upon, the 74C00 series (which provided an alternative CMOS logic family to the 4000 series but retained the part number scheme and pinouts of the standard 7400 series (especially the 74LS00 series) . Some specifications include:〔 *DC supply voltage *DC input voltage range *DC output voltage range *input rise and fall times *output rise and fall times HCMOS also stands for ''high-density CMOS''. The term was used to describe microprocessors, and other complex integrated circuits, which use a smaller manufacturing processes, producing more transistors per area. The Freescale 68HC11 is an example of a popular HCMOS microcontroller.〔(HCMOS acronyms ), thefreedictionary.com〕〔(HC11 Datasheet ): Motorola's HC11: HCMOS microcontroller family〕 ==Variations== * HCT stands for high-speed CMOS with transistor–transistor logic voltages. These devices are similar to the HCMOS types except they will operate at standard TTL power supply voltages and logic input levels. This allows for direct pin-to-pin compatible CMOS replacements to reduce power consumption without loss of speed. 〔("HCMOS family characteristics" ics.nxp.com )〕 * HCU stands for high-speed CMOS un-buffered. This type of CMOS contains no buffer and is ideal for crystals and other ceramic oscillators needing linearity. 〔("Ceramic Resonator Applications" www.ecsxtal.com )〕 * VHCMOS, or AHC, stands for very high-speed CMOS or advanced high-speed CMOS. 〔Ayers, John E. "Digital Integrated Circuits: Analysis and Design, Second Edition". CRC Press, December 15, 2003. p17.〕 Typical propagation delay time is between 3 ns and 4 ns. The speed is similar to Bipolar Schottky transistor TTL. 〔("TOSHIBA CMOS Digital Integrated Circuit" www.semicon.toshiba.co.jp )〕 * AHCT stands for advanced high-speed CMOS with TTL inputs. Typical propagation delay time is between 5 ns and 6 ns. 〔("AHCT - Advanced High-Speed CMOS" focus.ti.com ) 〕 〔 ("Advanced High-Speed CMOS Logic" www.ti.com )〕 〔("AHC(T) family overview" ics.nxp.com )〕 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「HCMOS」の詳細全文を読む スポンサード リンク
|