Why there is 74 in all logic gate IC?

Question

My sir Asked me Why there is 74 in logic gate IC, not 12 or 32.
like NAND gate 7400. Why op-amp IC has No 741. Please help me

Answer 1

7400 series logic was associated with bipolar technology
while 4000 with cmos

However op-amp741 and 7400 are labeled for different reasons.

Answer 2

Development of new parts can be chaotic and unpredictable. A lot of copying goes on if an idea looks good. Sometimes the ideas bounce around from company to company.

Fairchild produced the original ICs, then Motorola the took the same logic circuits, but put them in a 14 pin DIP package as the MC700 series. This was a plastic package that was well designed for high rate production. The cost per package was about the same as the Fairchild package, but each device had twice as many gates. These became more popular than the Fairchild parts.

The early commercial circuits from Texas Instruments were linear circuits (mostly op amps) packaged in 8 pin metal packages. These were the SN500 series for the military temperature range and some SN700 parts for the commercial temperature range (SN may have stood for Silicon Network or something similar). These circuits all used the same silicon die, but the metal layer hooked up the parts in different ways for different products.Texas Instruments also produced a TTL logic series for the Minuteman missle program. These were very expensive and packaged in a ceramic flat package that nobody ever really liked.

The SN7400 series was a combination of the Motorola package with the Minuteman TTL logic circuits and numbered as an extension of the few linear circuits that Texas Instruments was selling. There was also an SN5400 series of parts for the military temperature range.

This whole sequence of events took less than 5 years. The SN7400 series rapidly dropped in price to a level slightly more expensive than the MC700 series. Since it was about 10 times as fast as the MC700 series, the SN7400 series sold very well.

The SN7400 series used a lot of power. For applications that did not require high speed logic, a low power series was introduced, the SN74L00. For those that needed a little more speed there was the SN74H00 series. These circuits became available due to advances in technologies (p-channel vs. n-channel), but we don't want to go into that here.

After a few years, Texas Instruments developed the SN74S00 series using Schottky diodes. This used about the same power as the SN74H00 series and was considerably faster.

A lower power version of these circuits was introduced as the SN74LS00. These were about as fast as the SN74H00 and had about the same power consumption as the SN7400. Both the SN7400 series and the SN74H00 series dwindled rapidly after this.

In the meantime, RCA had developed the CD4000 series, which were CMOS logic parts. These were very low power and slow, probably about the same speed as the SN74L00 series but using much less power. The pin connections did not match those used for the SN7400 series.

National Semiconductor took the same basic circuits, but rearranged the pins to conform to the SN7400 series. These were numbered with a National prefix as the 74C00 series.

By this time nobody cared about the prefix anyway, Motorola was producing MC7400 series parts after trying to introduce a competing series, the MC4000 series. Most of the MC400 series disappeared within a couple of years.

The next step up in speed was the 74F00 series introduced by Fairchild. This was faster than the SN74S00 and used about the same power.

The SN74LS00 series started to decline when the 74HC00 series was introduced. This had about the same speed at lower power. There was also a 74HCT00 series, where the thresholds of the CMOS gates were adjusted to be compatible with TTL logic levels.

Subsequently, a faster series of CMOS gates, the 74ACT00 was introduced, and so it goes.
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The one common thing through all of this was the use of the 74 prefix on the part number. I suspect that the biggest reason for this was marketing, to try to associate a new product with a successful past product, often that of a competitor.
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The amazing thing is how often this was done with the 7400 series parts. If I wire a socket for an SN7400 part, with a 5 volt supply, I can interchange the SN7400, SN74L00, SN74H00, SN74S00, SN74LS00, 74C00, 74F00, 74HC00, 74HCT00, 74AC00 and 74ACT00, depending on the speed and power I want - that was fundamentally why the 7400 standard persisted: the people who used them liked the commonality of the numbering system.

The 741 was the part number from the first manufacturer of it National Semiconductor

Answer 3

There are a number of different series of digital ic's. The most common are the 54 and 74 hundred series, which are TTL or transistor-transistor logic. The difference between the two series is how the outputs are wired. In 5400 series, the outputs are open collector which means they are floating with respect to the power and ground pins and require an external resistor tied to +5v in order to set the default output voltage. In the 7400 series, that pullup resistor is installed internal to the chip. It is simply coincidence that the LM741 op-amp has a 74 in it's number, as there are an number of LM series linear devices that don't have 74 anywhere in there identifing numbers.

Answer 4

My sister - extremely booksmart. Graduated with her associates degree at the same time she graduated high school with a 3.9 GPA. Common sense = horrible. She literally asked me one day if "April fools day was in Feburary?". My best friend - 4.0 GPA since 9th grade. (now in 11th). She's really smart but once again, no common sense. Her comment that blew me away one day was "So if your power went out.. does that mean the lights were gone?"... and she's said worse things then that before. Common sense and booksmarts are two completely different things. So yea, it's very common... You don't learn one from the other, they're very separate. :) **added**: Bahaha. What is it with no common sense and holidays? =P Anyways.. wether shes a kid or not has nothing to do with it.. You still learn common sense and book smarts in two different ways..