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What are the advantages of TTL over CMOS?
TTL is less sensitive to static-discharge failure and less expensive. It is also faster. There is a condition called "latch up" that can happen with CMOS circuits if an overvoltage is applied during operation, so you have to design the input/output buffers to suit the operating conditions, like if a wire is attached. The first commercial applications of CMOS were by a company called Integrated Device Technology (IDT). Strangely enough, the singular advantage at that time was that CMOS allowed Hewlett Packard to create a practical calculator that was able to retain its memory registers when powered down. (Power was maintained to the chip, but the chip clock was stopped, and the chip could retain its state on very low power.) Before that though, the U.S. Navy used CMOS to reduce the size of circuits jammed in the nose cones of missiles so they could pack them with more explosives instead. TTL (Transistor-Transistor Logic) uses a different type of transistor (bipolar) whereas CMOS uses MOSFETs (metal oxide semiconductor field effect transistor). FETs don't have current flowing into the "gate" when static, whereas bipolars do (into the "base"), so generally this allows them to operate with lower power especially in a stand-by type of state. Before CMOS there was NMOS, which used N transistors and resistors. It's a bit complicated to explain in lay terms without a decent diagram, but CMOS stands for "Complimentary MOS" and uses a P transistor in place of the resistor. The advantage here is no static current flow is required, only at switching. Bipolar or TTL can in fact be faster, although it's not an apples-to-apples comparison because there are different processes for each. Some hybrids have been created like "BiCMOS," where both are combined on one chip. This is probably a lot more than you wanted to know. In short, CMOS is many things, but with the huge amounts of money invested in CMOS today it obviously has all the advantages necessary to be the default technology for most integrated electronics. * Other contributors say: CMOS logic has advantage of having smaller dimensions with new coming (usually smaller) technologies. Thus, the RC constant (RC defines transition time, where R = resistance is coming from R-ON resistance and C = capacitance is coming from gate capacitance) is smaller. Smaller RC constant means shorter transition (0->1 or 1->0)time. Logic is faster and can do more in same time (provided faster system clock). Same functionality is having smaller silicon area and this also means lower price for same functionality. Therefore the CMOS is very popular today and widely used. Concerning the ESD, yes CMOS is more sensitive, because breakdown of MOS gate is always destructive while impact of junction breakdown still depends on ESD pulse energy. Nevertheless, low-voltage CMOS is relatively easy to protect and our company has standard of 4kV ESD HBM (human body model) susceptibility as minimum. I do not remember problems after hand manipulation in the lab.
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TTL is faster than diode-transistor logic, and does bothamplification and logical operations. While they are ratherobsolete for most modern designs, they are good for simple a…ndspecialized products. So if you need a simple design that otherpeople may need to modify later, then TTL circuits might be morefeasible than using a microprocessor. TTL circuits are simple,well-documented, and well-understood. TTL circuits are also goodfor using for teaching purposes.
small battery located on the motherboard or computer case..
Answer . 5 Volt Is the standard, but any voltage between 3.5 and 5.2 is logic 1 in CMOS and TTL
Difference between CMOS and TTL . CMOS TTL . CMOS has good packing density. TTL takes up more space CMOS has better noise immmunity. TTL has a smaller noise immunity ran…ge CMOS has a large fan out. TTL can power less inputs CMOS consume less power. TTL use more power CMOS are highly static sensitive. TTL IC's tend to be less susceptible to static electricity CMOS uses FETS (Field-Effect Transistors) TTL uses BJTs (Bipolar junction Transistors CMOS can run with a range of supply voltages. TTL IC's run with a 5V supply. CMOS uses Vdd and Vss for it's power connections TTL uses BJTs (Bipolar junction Transistors. TTL More Powerful and Durable . CMOS takes a lot less power and is therefore suitable for battery applications, but generally speaking can't run as fast. TTL devices can drive more power into a load. CMOS chips can be damaged by static electricity: even a static jolt that you or I can't feel might destroy a CMOS chip!.
In IC (integated circuit) chips TTL stands for (TransistorTransistor Logic) which means that the chip incorporates bipolartransistors to provide both input logic and output po…wer drivestage switching functions. In a CMOS chip a different type ofdevice is used in switching. The (FET) Field Effect Transistor isused but in a chip it is more commonly known as the MOS FET. Sincethe MOS FET operates on different principles it is favored in chipoperation since it operates at cooler temperatures in which heat isone of the greatest enemies of any IC. High speed switchingcapability is greatly increased because of this factor. In thereplacement of IC's of this type safe handling precautions shouldbe observed and anti-static wrist straps with ground wires attachedto ground should be worn. This is used to drain static as the chipmay be destroyed otherwise. FET devices are designed with internalresistors to drain off static, but I would observe all precautionsto be on the safe side.
we know the answer.. but you are all not that much capable to understand that answer
whis is Endurance mors or ttl
A: As compared to what?
Power consumption and hence heat dissipation. Complimentary Metal On Silicon is well proven, switch on typically 2.4V with very little energy, and being so well known, also al…lows very high gate density. Please contest this on the discussion pages, and not by editing the answer. I know you can argue the answer, it is not that simple, but answers has to be simple. We need new technologies and the right one to use should change, that is called progress and development.
TTL, CMOS and ECL, all them are Small Scale Integration technologies used in different contexts. ECL basic family reaches rises and falls times of a few ns due to use of a s…mall voltage range and a lot of current, involving high power consumptions. High current and high speed induces a lot of electric-noise put layout designers to a complex and long design-process of PCB. CMOS basic family, otherwise, it is a very low power consumption SSI technology. CMOS uses high voltage digital levels and power, but it is relatively slow. This technology is low power and it has a high level of noise immunity. TTL basic family was the head of all other digital technologies. It is a sensible current consumer, a medium speed.
The main advantage of ECL over TTL is speed.
reduce the complexity of the circuit * low static power consumption * high noise immunity * high density of logic function on a chip The most important advantage of C…MOS is the very low static power consumption in compare with NMOS technology. On the other hand, CMOS technology is more complex to fabricate then NMOS technology, so it is more expensive. However, almost every todays digital circuits are CMOS. You want to use NMOS only when you want to fabricate fast and low-cost a simple circuit.The most important advantage of CMOS is the very low static power consumption in compare with NMOS technology. On the other hand, CMOS technology is more complex to fabricate then NMOS technology, so it is more expensive. However, almost every todays digital circuits are CMOS. You want to use NMOS only when you want to fabricate fast and low-cost a simple circuit.
The comparison between the CMOS and TTL logic families are as follows: property TTL CMOS power consumption High:20mw Low:1mw Operating current High:mA range Low m…icro-ampere range Power supply 5v+ or -0.25vdc 3v to 15vdc Switching speeds Fast:10ms Slow :100ns Input impedance Low High fan-out 10 50 .
A: LOGICALLY they are the same even physically but these family of IC are not to be interchanged not unless there are buffers to provide compatibility
The major advantage of CMOS over previous digital logic families (NMOS, TTL, RTL etc.) is that CMOS has almost no static current. Since CMOS only draws power during a transiti…on, low-power devices -- such as wristwatches -- typically use CMOS at low transition rates (lower losses). Even devices that run at very high speeds often have lower power consumption with CMOS than other digital logic families, because typically only a few gates make a transition at a time -- the vast majority of gates that don't transition save more than enough energy to make up for the few gates that transition and briefly consume more energy than TTL gates.
Lower power dissipation (except at very very high switching rates, as almost all the power dissipated by CMOS is during switching).