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Encyclopedia > 7400 series
The 7400 chip, containing four NANDs. The second line of smaller numbers (7645) is a date code; this chip was manufactured in the 45th week of 1976. The N suffix on the part number indicates PDIP packaging.
The 7400 chip, containing four NANDs. The second line of smaller numbers (7645) is a date code; this chip was manufactured in the 45th week of 1976. The N suffix on the part number indicates PDIP packaging.
74HC595 Shift registers on a PCB
74HC595 Shift registers on a PCB

The 7400 series of TTL integrated circuits are historically important as the first widespread family of IC logic. It was used to build the mini and mainframe computers of the sixties and seventies. Several generations of pin-compatible descendants of the original family have since been de-facto standard-components[1] for more than 40 years, and seen use in many types of products and equipment besides computers.[citation needed] Image File history File links 7400. ... Image File history File links 7400. ... // Function The NAND gate is a digital logic gate that behaves according to the truth table to the right. ... ICs in DIP14-Package Several PDIPs and CERDIPS. The large CERDIP in the foreground is an 8080 processor. ... Image File history File linksMetadata 74HC595. ... Image File history File linksMetadata 74HC595. ... In digital circuits a shift register is a group of flip flops set up in a linear fashion which have their inputs and outputs connected together in such a way that the data are shifted down the line when the circuit is activated. ... Part of a 1983 Sinclair ZX Spectrum computer board. ... A Motorola 68000-based computer with various TTL chips. ... Integrated circuit of Atmel Diopsis 740 System on Chip showing memory blocks, logic and input/output pads around the periphery Microchips with a transparent window, showing the integrated circuit inside. ... Look up pin in Wiktionary, the free dictionary. ... The term compatibility has the following meanings: In telecommunication, the capability of two or more items or components of equipment or material to exist or function in the same system or environment without mutual interference. ...


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. A logic gate is an arrangement of electronically-controlled switches used to calculate operations in Boolean algebra. ... In digital circuits, the flip-flop, latch, or bistable multivibrator is an electronic circuit which has two stable states and thereby is capable of serving as one bit of memory. ... ALU redirects here. ... List of 7400 series TTL integrated circuits: 7400: Quad 2-input NAND Gate 7401: Quad 2-input NAND Gate with Open Collector Outputs 7402: Quad 2-input NOR Gate 7403: Quad 2-input NAND Gate with Open Collector Outputs (different pinout than 7401) 7404: Hex Inverter 7405: Hex Inverter with...


Today, cheap surface-mounted CMOS versions of the 7400 series are used in consumer electronics and for glue logic in computers and industrial electronics, along with modern variants of the equally important 4000 series. The fastest parts are surface-mount only, but hole-mounted devices, which are very useful for rapid breadboard-prototyping and education, are also readily available. Surface-mount components on a keydrives circuit board Surface mount technology (SMT) is a method for constructing electronic circuits in which the components are mounted directly onto the surface of printed circuit boards (PCBs). ... In electronics, glue logic refers to the custom electronic circuitry needed to achive compatible interfaces between two (or more) differrent off-the-shelf integrated circuits. ... The 4000 series is the general classification referring to the industry standard integrated circuits which implement a variety of logic functions using CMOS technology. ... Surface-mount components on a keydrives circuit board Surface mount technology (SMT) is a method for constructing electronic circuits in which the components are mounted directly onto the surface of printed circuit boards (PCBs). ... Through-hole technology, also spelled thru-hole, refers to the mounting scheme used for electronic components that involves the use of pins on the components that are inserted into holes drilled in printed boards and soldered to pads on the opposite side. ... A breadboard with a completed circuit A breadboard is a reusable solderless device used to build a (generally temporary) prototype of an electronic circuit and for experimenting with circuit designs. ...


The 14-pin DIP shown to the right is an example of a 7400 part. The chip contains four two-input NAND gates. Each gate uses two pins for input and one pin for its output, the two additional contacts supply power (+5 V) and connect the ground. (The former Soviet Union manufactured the K155ЛA3 which was pin-compatible with the 7400 part available in the United States.[2]) // Function The NAND gate is a digital logic gate that behaves according to the truth table to the right. ...


While designed as a family of digital logic, it was not unusual to see TTL-chips in analog circuits like Schmitt triggers, various generators or voltage stabilizers.[citation needed] Like the 4000 series, the newer CMOS versions of the 7400 series are also perfectly usable as analog (often audio) amplifiers using negative feedback (similar to operational amplifiers with only an inverting input). In electronics, a Schmitt (or Schmidt) trigger is a comparator circuit that incorporates positive feedback. ... The 4000 series is the general classification referring to the industry standard integrated circuits which implement a variety of logic functions using CMOS technology. ... For other uses, see CMOS (disambiguation). ... A 741 operational amplifier in a TO-5 metal can package An operational amplifier, usually referred to as an op-amp for brevity, is a DC-coupled high-gain electronic voltage amplifier with Differential Inputs and, usually, a single output. ...

Contents

7400 series subfamilies

Early 7400 series parts were constructed using bipolar transistors. Newer sub-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 4000 series of CMOS devices. Bipolar devices are also limited to a fixed power supply voltage, typically 5V, while CMOS parts often support a range of supply voltages. The schematic symbols for pnp_ and npn_type BJTs. ... For other uses, see CMOS (disambiguation). ... In integrated circuit technologies, BiCMOS, also called BiMOS, refers to the integration of bipolar junction transistors and CMOS technology into a single device. ... The 4000 series is the general classification referring to the industry standard integrated circuits which implement a variety of logic functions using CMOS technology. ...


Milspec rated devices for use in extended temperature conditions are available as the 5400 series. A shortlived 6400 series was rated for an intermediate (industrial) temperature range. [citation needed] ...


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. Strictly, an integrated circuit made in CMOS is no longer a TTL chip since it uses FETs and not bipolar junction transistors, but similar part numbers are retained to identify similar logic functions in the different subfamilies.

  • Bipolar
    • L - Low power, very slow (rendered obsolete by the LS-series)
    • H - High speed (rendered obsolete by the S-series, used in 1970s era computers)
    • S - Schottky (obsolete)
    • LS - Low Power Schottky
    • AS - Advanced Schottky
    • ALS - Advanced Low Power Schottky
    • F - Fast (faster than normal Schottky, similar to AS)
  • CMOS
    • C - CMOS 4-15V operation similar to 4000 series
    • HC - High speed CMOS, similar performance to LS
    • HCT - High speed, compatible logic levels to bipolar parts
    • AC - Advanced CMOS, performance generally between S and F
    • AHC - Advanced High-Speed CMOS, three times as fast as HC
    • FC - Fast CMOS, performance similar to F
    • LCX - CMOS with 3V supply and 5V tolerant inputs
    • LVQ - Low voltage - 3.3V
    • LVX - Low voltage - 3.3V with 5V tolerant inputs
    • VHC - Very High Speed CMOS - 'S' performance in CMOS technology and power
    • G - Super high speeds at more than 1 GHz (Produced by Potato Semiconductor)
  • BiCMOS
    • BCT - BiCMOS, TTL compatible input thresholds, used for buffers
    • ABT - Advanced BiCMOS, TTL compatible input thresholds, faster than ACT and BCT

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 3.3V cmos signals. The non-T parts have conventional CMOS input thresholds. The 1970s decade refers to the years from 1970 to 1979, also called The Seventies. ... Schottky diode schematic symbol The Schottky diode (named after German physicist Walter H. Schottky; also known as hot carrier diode) is a semiconductor diode with a low forward voltage drop and a very fast switching action. ...


The 74L family is a relatively low-power, but slower version of the 74 family.


The 74H family is the same basic design as the 7400 family with resistor values reduced. This reduced the typical propagation delay from 9ns to 6ns but increased the power consumption. The 74H family provided a number of unique devices for CPU designs in the 1970s.


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 than the original 74 family; it became the most popular variant once it was widely available. Schottky diode schematic symbol The Schottky diode (named after German physicist Walter H. Schottky; also known as hot carrier diode) is a semiconductor diode with a low forward voltage drop and a very fast switching action. ...


The 74F family was introduced by Fairchild Semiconductor and adopted by other manufacturers; it is faster than the 74, 74LS and 74S families. Fairchild Semiconductor introduced the first commercially available integrated circuit (although at almost the same time as one from Texas Instruments), and would go on to become one of the major players in the evolution of Silicon Valley in the 1960s. ...


Through the late 1980s and 1990s newer versions of this family were introduced to support the lower operating voltages used in newer microprocessor and personal computer CPU devices. “CPU” redirects here. ...


History

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

Although the 7400 series was the first de facto industry standard TTL logic family, there were earlier TTL logic families such as the Sylvania SUHL family, Motorola MC4000 MTTL family (not to be confused with RCA CD4000 CMOS), the National Semiconductor DM8000 family, and the Signetics 8200 family. Image File history File links Size of this preview: 669 × 599 pixelsFull resolution (738 × 661 pixel, file size: 748 KB, MIME type: image/gif) An Implementation of a 4-bit two register computer, including six cpu assembly instructions: READ (read input), INCB (increment register B), MOVAB (move contents of register... Image File history File links Size of this preview: 669 × 599 pixelsFull resolution (738 × 661 pixel, file size: 748 KB, MIME type: image/gif) An Implementation of a 4-bit two register computer, including six cpu assembly instructions: READ (read input), INCB (increment register B), MOVAB (move contents of register... Sylvania literally means forest land in Latin. ... Motorola Inc. ... Categories: Electronics companies of the United States | Companies based in California | Corporation stubs ... Signetics, once a major player in semiconductor manufacturing, made a variety of devices which included integrated circuits, bipolar and MOS, the Dolby circuit, logic, memory and analog circuits and Motorola clone CPUs, some of which were included in the first Atari video games. ...


The 7400 NAND gate was the first product in the series. ...


The 5400 and 7400 series were used in many popular minicomputers in the Seventies and early Eighties. 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. HP2114 minicomputer Minicomputer is a largely obsolete term for a class of multi-user computers which make up the middle range of the computing spectrum, in between the largest multi-user systems (mainframe computers) and the smallest single-user systems (microcomputers or personal computers). ... Programmed Data Processor (abbreviated PDP) was the name of a series of computers, several of them ground-breaking and very influential, made by Digital Equipment Corporation. ... The 74S181 4 bit ALU bitslice resting on a page from the datasheet. ... A typical schematic symbol for an ALU: A & B are operands; R is the output; F is the input from the Control Unit; D is an output status In computing, an arithmetic logic unit (ALU) is a digital circuit that performs arithmetic and logical operations. ... “CPU” redirects here. ... Data General SuperNova The Data General Nova was a popular 16-bit minicomputer built by the United States company Data General starting in 1969. ... The Hewlett-Packard Company (NYSE: HPQ), commonly known as HP, is a very large, global company headquartered in Palo Alto, California, United States. ...


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. This article deals with electronics manufacturing and prototyping techniques, see Wire wrap jewellery for the jewellery related topic Wire wrap is a technique for constructing small numbers of complex electronics. ... A breadboard with a completed circuit A breadboard is a reusable solderless device used to build a (generally temporary) prototype of an electronic circuit and for experimenting with circuit designs. ... A wall wart style variable DC power supply with its cover removed. ... The front cover of the April 1981 issue of BYTE (Vol 6. ... The cover of the premier issue of Popular Electronics magazine Popular Electronics was started by Ziff-Davis in October 1954. ...


As of 2007, individual chips can be purchased for approximately 0.25 USD each, depending on the particular chip. Purchased in bulk the price per unit falls to even lower prices per package. Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... The United States dollar is the official currency of the United States. ...


Part numbering scheme

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

  • First a two or three letter prefix which indicates the manufacturer of the device
  • A two-figure secondary prefix, of which the two most common are '74', indicating a commercial temperature range device and '54', indicating an extended (military) temperature range
  • Up to four letters describing the logic subfamily, as listed above.
  • Two or more digits assigned for each device. There are hundreds of different devices in each family but when this number is the same, the function and pin-out of the chip is nearly always the same regardless of manufacturer -- exceptions include some flat-pack devices, surface-mount devices, some of the faster CMOS series (for example 74AC), and at least one low-power TTL device has a different pin-out than the regular series part.[3]
  • Additional suffix letters and numbers may be attached to indicate the package type, quality grade, or other information but this varies widely by manufacturer.

For example SN74ALS245 means this is a device made by Texas Instruments, it is a commercial temperature range TTL device, it is a member of the "advanced low-power Schottky" family, and it is a bi-directional eight bit buffer. List of 7400 series TTL integrated circuits: 7400: Quad 2-input NAND Gate 7401: Quad 2-input NAND Gate with Open Collector Outputs 7402: Quad 2-input NOR Gate 7403: Quad 2-input NAND Gate with Open Collector Outputs (different pinout than 7401) 7404: Hex Inverter 7405: Hex Inverter with... Pinout is a term used in electronics to describe how a connector is wired. ... Texas Instruments (NYSE: TXN), better known in the electronics industry (and popularly) as TI, is an American company based in Dallas, Texas, USA, renowned for developing and commercializing semiconductor and computer technology. ...


Many logic families keep the numeric sequence of a similar TTL device as an aid to designers. In computer engineering, a logic family of monolithic digital integrated circuit devices is a group of electronic logic gates constructed using one of several different designs, usually with compatible logic levels and power supply characteristics within a family. ...


See also

List of 7400 series TTL integrated circuits: 7400: Quad 2-input NAND Gate 7401: Quad 2-input NAND Gate with Open Collector Outputs 7402: Quad 2-input NOR Gate 7403: Quad 2-input NAND Gate with Open Collector Outputs (different pinout than 7401) 7404: Hex Inverter 7405: Hex Inverter with... A logic gate performs a logical operation on one or more logic inputs and produces a single logic output. ...

References

  1. ^ In the sense that common types of operational amplifiers, discrete transistors, diodes, etc, are regarded as such
  2. ^ Relation between names of foreign and Russian logic chips (HTML) (Russian). Retrieved on 26 March, 2007.
  3. ^ The Engineering Staff, Texas Instruments [1973]. The TTL Data Book for Design Engineers, 1st edition. 

A 741 operational amplifier in a TO-5 metal can package An operational amplifier, usually referred to as an op-amp for brevity, is a DC-coupled high-gain electronic voltage amplifier with Differential Inputs and, usually, a single output. ...

External links

  • 4-bit processor made with 7400 series chips
  • Computer made with 7400 series chips
  • Giga Hz 7400 series chips
  • Computer made completely from scratch out of 7400 chips

  Results from FactBites:
 
7400 series at AllExperts (907 words)
The 7400 series of TTL integrated circuit SSI devices were historically important as the first widespread family of IC devices.
Early 7400 series parts were constructed using bipolar transistors, although most newer sub-series use CMOS technology or a combination of the two (BiCMOS).
Although the 7400 series was the first de facto industry standard TTL logic family, there were earlier TTL logic families such as the Sylvania SUHL family, Motorola MC4000 MTTL family (not to be confused with RCA CD4000 CMOS), theNational Semiconductor DM8000 family, and the Signetics 8200 family.
7400 series - Wikipedia, the free encyclopedia (1288 words)
The 7400 series of TTL integrated circuit devices are historically important as the first widespread family of IC logic and it was used to build the mini and mainframe computers of the sixties and seventies.
The 5400 and 7400 series were used in many popular minicomputers in the Seventies and early Eighties.
The DEC PDP series 'minis' used the 74181 ALU as the main computing element in the CPU.
  More results at FactBites »

 
 

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