7400 series

Upper half is a line diagram showing four NAND gate symbols in a rectangle. Lower half is a photo of a grey rectangular integrated circuit package with metal pins on the two long sides, and lettering on top as described in the caption
The 7400 chip, containing four NANDs. The second line of numbers (7645) is a date code; this chip was manufactured in the 45th week of 1976.[1] The N suffix on the part number is a vendor-specific code indicating PDIP packaging.
Surface-mounted 74HC595 shift registers on a PCB. This IC is actually a high-speed cmos circuit. If the product code had been 74HCT595, it would have been compatible with TTL signalling levels.

The 7400 series of transistor–transistor logic (TTL) integrated circuits are the most popular family of TTL integrated circuit logic.[2][3] Quickly replacing diode–transistor logic, it was used to build the mini and mainframe computers of the 1960s and 1970s. Several generations of pin-compatible descendants of the original family have since become de facto standard electronic components.

Overview

The 7400 series contains hundreds of devices that provide everything from basic logic gates, flip-flops, and counters, to special purpose bus transceivers and arithmetic logic units (ALU). Specific functions are described in a list of 7400 series integrated circuits.

Today, surface-mounted CMOS versions of the 7400 series are used in various applications in electronics and for glue logic in computers and industrial electronics. The original through-hole devices in dual in-line packages (DIP/DIL), which were the mainstay of the industry for many decades, are very useful for rapid breadboard-prototyping and education and so remain available from most manufacturers. The fastest types and very low voltage versions are typically surface-mount only, however.

The first part number in the series, the 7400, designates a device containing four two-input NAND gates. Each gate uses two pins for input and one pin for its output, and the remaining two contacts supply power (+5 V) and connect the ground. This part was made in various packages including flat pack, plastic or ceramic dual in-line packages with 14 pins, and in surface mount packages as well. Additional numbers and letters in a full part number identify the package and other variations.

While designed as a family of digital logic, some TTL chips were used in analog circuits like Schmitt triggers. Like the 4000 series, the newer CMOS versions of the 7400 series are also usable as analog amplifiers using negative feedback (similar to operational amplifiers with only an inverting input).

7400 series derivative families

Part of the 7400 series: cascadable 8-bit ALU Texas Instruments SN74AS888
Die of a 74HC595 8-bit shift register
Die of a 74AHC00D quad 2-input NAND gate manufactured by NXP Semiconductors

7400 series parts were constructed using bipolar transistors, forming what is referred to as transistor–transistor logic or TTL. Newer series, more or less compatible in function and logic level with the original parts, use CMOS technology or a combination of the two (BiCMOS). Originally the bipolar circuits provided higher speed but consumed more power than the competing 4000 series of CMOS devices. Bipolar devices are also limited to a fixed power supply voltage, typically 5 V, while CMOS parts often support a range of supply voltages.

Milspec-rated devices for use in extended temperature conditions are available as the 5400 series. Texas Instruments also manufactured radiation-hardened devices with the prefix RSN, and the company offered beam-lead bare dies for integration into hybrid circuits with a BL prefix designation. [4]

Regular-speed TTL parts were also available for a time in the 6400 series – these had an extended industrial temperature range of −40 °C to +85 °C. While companies such as Mullard listed 6400-series compatible parts in 1970 data sheets,[5] by 1973 there was no mention of the 6400 family in the Texas Instruments TTL Data Book. Some companies have also offered industrial extended temperature range variants using the regular 7400 series part numbers with a prefix or suffix to indicate the temperature grade.

As integrated circuits in the 7400 series were made in different technologies, usually compatibility was retained with the original TTL logic levels and power supply voltages. An integrated circuit made in CMOS is not a TTL chip, since it uses field-effect transistors (FETs) and not bipolar junction transistors, but similar part numbers are retained to identify similar logic functions and electrical (power and I/O voltage) compatibility in the different subfamilies. Over 40 different logic subfamilies use this standardized part number scheme.[6]

Many parts in the CMOS HC, AC, and FC families are also offered in "T" versions (HCT, ACT, and FCT) which have input thresholds that are compatible with both TTL and 3.3 V CMOS signals. The non-T parts have conventional CMOS input thresholds.

The 74H family is the same basic design as the 7400 family with resistor values reduced. This reduced the typical propagation delay from 9 ns to 6 ns but increased the power consumption. The 74H family provided a number of unique devices for CPU designs in the 1970s. Many designers of military and aerospace equipment used this family over a long period and as they need exact replacements, this family is still produced by Lansdale Semiconductor.[9]

The 74S family, using Schottky circuitry, uses more power than the 74, but is faster. The 74LS family of ICs is a lower-power version of the 74S family, with slightly higher speed but lower power dissipation than the original 74 family; it became the most popular variant once it was widely available.

The 74F family was introduced by Fairchild Semiconductor and adopted by other manufacturers; it is faster than the 74, 74LS and 74S families.

Through the late 1980s and 1990s newer versions of this family were introduced to support the lower operating voltages used in newer CPU devices.

Characteristics of Selected 7400 Series Families[10]
Parameter 74C 74HC 74AC 74HCT 74ACT Units
(VDD = 5 V)
VIH (min) 3.5 2.0 V
VOH (min) 4.5 4.9 V
VIL (max) 1.5 1.0 1.5 0.8 V
VOL (max) 0.5 0.1 V
IIH (max) 1 μA
IIL (max) 1 μA
IOH (max) 0.4 4.0 24 4.0 24 mA
IOL (max) 0.4 4.0 24 4.0 24 mA
TP (max) 50 8 4.7 8 4.7 ns

History

A 4-bit, 2 register, six-instruction computer made entirely of 74-series chips

Although the 7400 series was the first de facto industry standard TTL logic family (i.e. second-sourced by several semiconductor companies), there were earlier TTL logic families such as the Sylvania SUHL (Sylvania Universal High-level Logic) family, Motorola MC4000 MTTL family (not to be confused with RCA CD4000 CMOS), the National Semiconductor DM8000 family, Fairchild 9300 series, and the Signetics 8200 and 8T00 family.

The 7400N quad NAND gate was the first product in the series, introduced by Texas Instruments in a military grade metal flat package in October 1964. The extremely popular commercial grade plastic DIP followed in the third quarter of 1966.[11]

The 5400 and 7400 series were used in many popular minicomputers in the 1970s and early 1980s. Some models of the DEC PDP series 'minis' used the 74181 ALU as the main computing element in the CPU. Other examples were the Data General Nova series and Hewlett-Packard 21MX, 1000, and 3000 series.

Hobbyists and students equipped with wire wrap tools, a 'breadboard' and a 5-volt power supply could also experiment with digital logic referring to how-to articles in Byte magazine and Popular Electronics which featured circuit examples in nearly every issue. In the early days of large-scale IC development, a prototype of a new large-scale integrated circuit might have been developed using TTL chips on several circuit boards, before committing to manufacture of the target device in IC form. This allowed simulation of the finished product and testing of the logic before the availability of software simulations of integrated circuits.

In 1965, typical quantity-one pricing for the SN5400 (military grade, in ceramic welded flat-pack) was around 22 USD.[12] As of 2007, individual commercial-grade chips in molded epoxy (plastic) packages can be purchased for approximately 0.25 USD each, depending on the particular chip.

Part numbering scheme

The part numbers for 7400 series logic devices often use the following naming convention, though specifics vary between manufacturers.

For example SN74ALS245N means this is a device probably made by Texas Instruments (SN), it is a commercial temperature range TTL device (74), it is a member of the "advanced low-power Schottky" family (ALS), and it is a bi-directional eight-bit buffer (245) in a plastic through-hole DIP package (N).

Many logic families maintain a consistent use of the device numbers as an aid to designers. Often a part from a different 74x00 subfamily could be substituted ("drop-in replacement") in a circuit, with the same function and pin-out yet more appropriate characteristics for an application (perhaps speed or power consumption), which was a large part of the appeal of the 74C00 series over the competing CD4000B series, for example. But there are a few exceptions where incompatibilities (mainly in pin-out) across the subfamilies occurred, such as:

Second sources in Europe and the Eastern Bloc

Some manufacturers such as Mullard and Siemens had pin-compatible TTL parts but with a completely different numbering scheme, however, data sheets identified the 7400-compatible number as an aid to recognition.

At the time the 7400 series was being made, some European manufacturers (that traditionally followed the Pro Electron naming convention) such as Philips/Mullard produced a series of TTL integrated circuits with part names beginning FJ. Some examples of FJ series are:

The Soviet Union started manufacturing TTL ICs with 7400 series pin-out in the late 1960s and early 1970s, such as the K155ЛA3 which was pin-compatible with the 7400 part available in the United States, except for using a metric spacing of 2.5mm between pins instead of the 1/10"-based (2.54mm) spacing used in the west.[15] Another peculiarity of the Soviet made 7400 series was the packaging material used in the 1970's - 80's. Instead of the ubiquitous black resin, they had a brownish-green body colour with subtle swirl marks created during the moulding process. It was jokingly referred to in the Eastern Block electronics industry as the "elephant dung packaging", due to its appearance.

The Soviet integrated circuit designation is different from the Western series:

Before July 1974 the two letters from the functional description were inserted after the first digit of the series. Examples: К1ЛБ551 and К155ЛА1 (7420), К1ТМ552 and К155ТМ2 (7474) are the same ICs made at different times.

Clones of the plain 7400 series were also made in other Eastern Bloc countries[16]

While Poland, Hungary, and Romania produced only the standard 7400 series in the standard temperature range, a number of different technologies were available from the Soviet Union,[15][18] [19] [20] Czechoslovakia,[21] and East Germany.[17] The 8400 series in the table below indicates an industrial temperature range from -25 °C to +85 °C (as opposed to −40 °C to +85 °C for the 6400 series).

Prefixes of Eastern European series
Soviet Union Czechoslovakia East Germany
5400 7400 5400 7400 8400 7400 8400
74 133 К155 MH54 MH74 MH84 D1 E1
74L 134 КР134
74H 130 К131 D2 E2
74S 530 КР531 MH54S MH74S MH84S
74LS 533 К555 DL
74AS 1530 КР1530
74ALS 1533 КР1533 MH54ALS MH74ALS
74F 1531 КР1531
74HC 1564 КР1564
74HCT U74HCT
74AC 1554 КР1554
74ACT 1594 КР1594

Around 1990 the production of standard logic ceased in all Eastern European countries except the Soviet Union and later Russia. As of 2016, the Russian company Angstrem manufactures 54HC circuits as the 5514БЦ1 series and 54AC as the 5514БЦ2 series.[22]

See also

References

  1. http://homepages.nildram.co.uk/~wylie/ICs/monolith.htm The first monolithic integrated circuits, retrieved 2013 December 7
  2. http://www.computerhistory.org/semiconductor/timeline/1963-TTL.html The Computer History Museum, 1963 Standard Logic Families Introduced, retrieved 2008 April 16
  3. Don Lancaster, "TTL Cookbook", Howard W. Sams and Co., Indianapolis, 1975, ISBN 0-672-21035-5 , preface
  4. The Engineering Staff, Texas Instruments (1973). The TTL Data Book for Design Engineers (1st ed.). Dallas, Texas.
  5. Mullard FJH 101 Data Sheet, from the Mullard FJ Family TTL Integrated Circuits 1970 databook, retrieved from http://www.datasheetarchive.com/preview/437512.html may 16, 2008
  6. "Logic reference guide: Bipolar, BiCMOS, and CMOS Logic Technology"
  7. http://www.computerhistory.org/semiconductor/timeline/1963-TTL.html
  8. http://www.ti.com/corp/docs/company/history/semiconductortimelinelowbandwidth.shtml
  9. Lansdale Semiconductor home page
  10. Maini, Anil (2007). Digital Electronics: Principles, Devices and Applications. John Wiley & Sons. p. 168. ISBN 978-0-470-03214-5.
  11. http://smithsonianchips.si.edu/texas/ic.htm
  12. Allied Industrial Electronics Catalog #660. Chicago, Illinois: Allied Electronics. 1966. p. 35.
  13. The Engineering Staff, Texas Instruments (1973). The TTL Data Book for Design Engineers (1st ed.). Dallas, Texas.
  14. The Engineering Staff, National Semiconductor Corporation (1976). National Semiconductor TTL DATA BOOK. Santa Clara California. pp. 1–14.
  15. 1 2 "Relation between names of foreign and Russian logic chips" (in Russian). Archived from the original on 28 February 2007. Retrieved 26 March 2007.
  16. http://www.pchelar-probvaisambg.com/statia115_40_spisak.htm
  17. 1 2 GDR semiconductor datasheet comparison (in German)
  18. Ниссельсон, Л.И. (1989). Цифровые и аналоговые интегральные микросхемы (in Russian). Радио и связь. ISBN 5256002597.
  19. "Активные элементы" (in Russian). Музей электронных раритетов. Retrieved 24 March 2016.
  20. Козак, Виктор Романович (24 May 2014). "Номенклатура и аналоги отечественных микросхем" (in Russian). Retrieved 24 March 2016.
  21. "Integrované obvody" (in Czech). Retrieved 17 March 2016.
  22. "Интегральные схемы стандартной логики" (in Russian). Angstrem. Retrieved 18 March 2016.

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