Soviet integrated circuit designation

This article describes the nomenclature for integrated circuits manufactured in the Soviet Union. 25 years after the dissolution of the Soviet Union this designation is still used by a number of manufacturers in Russia, ^{[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33]} Belarus, ^{[34] [35] [36]} Ukraine, ^{[37] [38] [39] [40]} Latvia, ^{[41] [42]} and Uzbekistan. ^[43] The designation uses the Cyrillic alphabet which sometimes leads to confusion where a Cyrillic letter has the same appearance as a Latin letter but is romanized as a different letter. Furthermore, for some Cyrillic letters the Romanization is ambiguous.

History

The nomenclature for integrated circuits has changed somewhat over the years as new standards were published:

• 1968 – NPO.034.000 (Russian: НПО.034.000) ^{[44][45](pp19–23)}
• 1973 – GOST 18682—73 (Russian: ГОСТ 18682—73) ^{[45](pp19–23)}
• 1980 – OST 11.073.915—80 (Russian: ОСТ 11.073.915—80) ^{[46](pp10–16)[47]}
• 2000 – OST 11.073.915—2000 (Russian: ОСТ 11.073.915—2000) ^[48]
• 2010 – GOST RV 5901-005—2010 (Russian: ГОСТ РВ 5901-005—2010) ^[49]

Throughout this article the standards are referred to by the year they came into force. Before 1968 each manufacturer used its own integrated circuit designation.^[50][44]

In general, devices already in production when a new standard came out kept their old designation. However, in some case devices were renamed:

• When the 1980 standard was published, devices named after the 1968 standard and still in production were renamed, e.g. К1ЛБ553 to К155ЛА3.^[44][51] As in this example, the renaming was often fairly straightforward: The two parts of the serial number were combined (1 and 55 to 155), the functional group remained unchanged or was converted as in the table below (ЛБ to ЛА), and the variant number remained unchanged (3). In some series the renaming was more complicated.^[52] This change affected many series (e.g. 101, 116, 118, 122, 133, 140, 153, 155, 174, 237, 501).
• Before the introduction of a package designation in 1980 the suffix П (P) was used in some series to indicate a plastic package (as opposed to the then more common ceramic package). In 1983 the package designation was changed for the 531 series (e.g. К531ЛА19П to КР531ЛА19).^{[46](pp59–60)} Other series were similarly renamed at some point (e.g. К501ХЛ1П to КР501ХЛ1).
• Before the definition of group В (V) in 1980 computing devices were all assigned subgroup ИК (IK), e.g. microprocessors (КР580ИК80А), peripheral devices (КР580ИК51А). With the introduction of group В the devices in the 580 series were renamed (to КР580ВМ80А and КР580ВВ51А, respectively) in 1986.

Structure of the designation

Structure (1968)

Structure (1973 / 1980)

Structure (2000)

Elements:

• 1 – Prefix (zero to three letters)
  • 1a – Export designation: The letter Э (E) here indicates an integrated circuit intended for export with a pin spacing of 2.54mm (1/10") or 1.27mm (1/20"). If this element is empty then the device has the Soviet (metric) spacing of 2.5mm or 1.25mm between pins.
  • 1b – Application area: The letter К (K) here indicates an integrated circuit for commercial and consumer applications. If this element is empty then the device is intended for military or aero-space applications.
  • 1c – Package designation (1980) (Note that the letters Э and К are not valid package designations. If this element is empty then the package is simply not specified in the designation, i.e. it could be any of the packages.)
• 2 – Series (three or four digits)
  • 2a – Manufacturing technology (one digit):
    • Monolithic integrated circuits: 1, 5, or 6
    • Monolithic integrated circuits – bare chip without package: 7
    • Hybrid integrated circuits: 2, 4, or 8
    • Other integrated circuits (e.g. thin film): 3
  • 2b – For four-digit series the second digit of the number of the series has significance as well:
    • Series for household electronics: 0
    • Series of analogue devices: 1
    • Series of operational amplifiers: 4
    • Series of digital devices: 5
    • Series of memory devices: 6
    • Series of microprocessor families: 8
  • 2c – Number of the series (2 digits): The numbers of the series are assigned sequentially and have no further meaning. Devices in a series have some characteristic in common although it varies from one series to another which characteristic that is (e.g. logic family for logic gates, instruction set for microprocessors).
  • 2d – Number of the series (2 or 3 digits): The 2000 standard does not assign a special meaning to the second digit of a 4-digit series.
• 3 – Functional Group (two letters)
  • 3a – Group
  • 3b – Subgroup within the group: All groups have the subgroup П (P) for "others", that is for devices that fall into the group but not into any of the other defined subgroups.
• 4 – Variant within the functional subgroup (one to four digits): Usually the variant numbers are assigned sequentially for devices within the subgroup (e.g. ЛА1, ЛА2, ЛА3, etc.). In some series the variant number matches the last two or three digits of the designation of its Western counterpart (e.g. К500ЛК117 and MC10117).
• 5 – Suffix
  • 5a – Version (one letter, А to Я except З and Й): This optional element indicates versions of an integrated circuit with different electrical or thermal characteristics (e.g. switching speed, voltage range, etc.). It can also indicate an improved version of a device (e.g. К580ИК80 vs. К580ИК80А). Before 1980 the suffix П (P) was sometimes used to indicate a version in a plastic package instead of a ceramic package (e.g. К145ИК2П, К531ЛА19П) or a round metal can (e.g. К144ИР1П).
  • 5b – Version (one letter, А to М except З and Й)
  • 5c – Package designation (2000) (one letter, Н to Я): If this element is empty then the package is simply not specified in the designation, i.e. it could be any of the packages. Note that the letter ranges for version and package designation do not overlap.
  • 5d – Manufacturer designation (two letters)

Functional Groups

Packages

Package designation (1973)

The package of an integrated circuit was generally not indicated in the 1973 designation, with two exceptions:

• Bare chips without a package received a series number in the 7xx range, e.g. K712RV2-1 (К712РВ2-1).
• The suffix П (P) was sometimes used to indicate a version in a plastic package instead of a ceramic package (e.g. К145ИК2П, К531ЛА19П) or a round metal can (e.g. К144ИР1П).

Package designation (1980)

Package designation (2000)

Manufacturer designation

A manufacturer designation was introduced only with the 2000 standard. The table below is incomplete, many manufacturers still do not use their assigned designation. Manufacturer logos^[55] are more common.

Romanization

The Romanization of Russian is standardized, only there are at least 11 standards to choose from. Fortunately, the Soviet integrated circuit designation uses a subset of the Cyrillic alphabet where rather few letters are ambiguous:

• Ж: Ž, Zh
• Х: X, H, Ch, Kh
• Ц: C, Cz, Ts, Tc
• Ч: Č, Ch

The more common romanizations in bold are given as alternatives in the above tables.

Е and Э are both romanized as E.

It should be noted that the French romanization of Russian and the German romanization of Russian differ in some letters from the one used in English. For instance, the Russian КР580ВМ80A becomes KR580VM80A in English and French but KR580WM80A in German literature.

See also

• List of Soviet microprocessors
• Commons:Gallery of Soviet integrated circuits
• 7400 series – Second sources in Europe and the Eastern Bloc
• List of 7400 series integrated circuits
• Pro Electron – Integrated circuits

References