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What are the advantages of TTL over CMOS?

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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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What are the advantages of TTL?

TTL is faster than diode-transistor logic, and does both  amplification and logical operations. While they are rather  obsolete for most modern designs, they are good for si

What is the difference ttl and cmos?

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 nois

What is the difference between TTL and CMOS?

In IC (integated circuit) chips TTL stands for (Transistor  Transistor Logic) which means that the chip incorporates bipolar  transistors to provide both input logic and out

What are the advantages of CMOS over PMOS?

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

How do you compare the advantages and disadvantages of TTL CMOS and ECL logic families?

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

What are the Advantages of cmos over pmos and nmos?

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 CM

How do you compare the cmos and ttl logic families?

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 micro-am

What are the advantages of CMOS over TTL circuit?

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

What is a typical advantage of CMOS over TTL?

CMOS uses no power when it is doing nothing, while TTL always uses  the same amount of power.   However for a very long time CMOS was much slower than TTL (they  are now