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{{Short description|Specifications for the 74HC00 IC family}}
'''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]].<ref name="philips">[http://www.standardics.nxp.com/support/documents/logic/pdf/family.hcmos.specification.pdf HCMOS family characteristics] {{webarchive|url=https://web.archive.org/web/20080720001502/http://www.standardics.nxp.com/support/documents/logic/pdf/family.hcmos.specification.pdf |date=2008-07-20 }}, Philips Semiconductors, March 1988</ref>

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:<ref name="philips" />
*DC supply voltage (Vcc): the "74HC" and "74HCU" units could use 2.0–6.0 volts, unlike the earlier 5.0±0.5 volt units and "74HCT"
*DC input voltage range, DC output voltage range: between 0 and Vcc
*input rise and fall times: depends on input voltage, ranging from 1000 ns at 2.0 volts and 400 ns at 6.0 volts
*output rise and fall times

The typical maximum frequency (fmax) is noted as 60 MHz. For a comparison between 7400 types, see {{section link|7400-series integrated circuits|Families}}.<ref name="philips" />

HCMOS also stands for ''high-density CMOS''.{{cn|date=February 2015}} 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]].<ref name="thefreedictionary">[http://acronyms.thefreedictionary.com/HCMOS HCMOS acronyms], thefreedictionary.com</ref><ref>[http://www.motorola-datasheet.com/hc11.htm HC11 Datasheet] {{Dead link|date=May 2017}}: Motorola's HC11: HCMOS microcontroller family</ref>

==Variations==
[[File:Laptop Acrobat Model NBD 486C, Type DXh2 - Toshiba HCT00A on motherboard--4473.jpg|thumb|Toshiba HCT00A - NAND Gates]]
* '''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 [[Transistor–transistor_logic|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.<ref>[http://ics.nxp.com/support/documents/logic/pdf/family.hcmos.specification.pdf "HCMOS family characteristics" ics.nxp.com] {{webarchive|url=https://web.archive.org/web/20110911131108/http://ics.nxp.com/support/documents/logic/pdf/family.hcmos.specification.pdf |date=2011-09-11 }}</ref>
* '''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.<ref>[http://www.ecsxtal.com/store/pdf/cer_prin.pdf "Ceramic Resonator Applications" www.ecsxtal.com]</ref>
* '''VHCMOS''', or '''AHC''', stands for very high-speed CMOS or advanced high-speed CMOS.<ref>Ayers, John E. "Digital Integrated Circuits: Analysis and Design, Second Edition". CRC Press, December 15, 2003. p17.</ref> Typical [[propagation delay]] time is between 3 ns and 4 ns. The speed is similar to Bipolar [[Schottky transistor]] [[Transistor–transistor logic|TTL]].<ref>[http://www.semicon.toshiba.co.jp/docs/datasheet/en/LogicIC/TC74VHC125F_TC74VHC126FT_en_datasheet_071001.pdf "TOSHIBA CMOS Digital Integrated Circuit" www.semicon.toshiba.co.jp] {{webarchive|url=https://web.archive.org/web/20120420034729/http://www.semicon.toshiba.co.jp/docs/datasheet/en/LogicIC/TC74VHC125F_TC74VHC126FT_en_datasheet_071001.pdf |date=2012-04-20 }}</ref>
* '''AHCT''' stands for advanced high-speed CMOS with [[Transistor–transistor_logic|TTL]] inputs. Typical [[propagation delay]] time is between 5 ns and 6 ns.<ref>[http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?familyId=1&family=logic&uiTemplateId=SZ_T&parameter=2582704419&techFamId=5&military=no "AHCT - Advanced High-Speed CMOS" focus.ti.com] {{webarchive|url=https://archive.today/20120710182613/http://focus.ti.com/paramsearch/docs/parametricsearch.tsp?familyId=1&family=logic&uiTemplateId=SZ_T&parameter=2582704419&techFamId=5&military=no |date=2012-07-10 }}</ref><ref>{{Cite web |url=http://www.ti.com/lit/ml/sgyn133/sgyn133.pdf |title="Advanced High-Speed CMOS Logic" www.ti.com |access-date=2012-02-07 |archive-date=2011-09-05 |archive-url=https://web.archive.org/web/20110905005506/http://www.ti.com/lit/ml/sgyn133/sgyn133.pdf |url-status=dead }}</ref><ref>[http://ics.nxp.com/products/ahc/overview/ "AHC(T) family overview" ics.nxp.com] {{webarchive|url=https://web.archive.org/web/20120604051611/http://ics.nxp.com/products/ahc/overview/ |date=2012-06-04 }}</ref>

==References==
{{Reflist}}

==External links==
*[http://focus.ti.com/lit/an/scla007a/scla007a.pdf HCMOS Design Considerations], Texas Instruments

{{DEFAULTSORT:Hcmos}}
[[Category:Integrated circuits]]
[[Category:Digital electronics]]

HCMOS - Revision history

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