Altium ICs Passive power embedded Actuators More..
Difference in between TTL and CMOS ICs


It to be 1958 when Jack Kilby indigenous Texas Instruments, presented the world’s very first Integrated Circuit (IC) Chip to the electronic devices industry. This development spread choose wild fire since ICs were an ext reliable, compact and could also save power compared to the traditional circuits provided then. Soon this spread like wild fire and also every firm started fabricating and adapting combined circuits which cause the modern electronics together we know today. Over there are many fabrication techniques used in IC production the two most popular species are the Transistor Transistor reasonable (TTL) which acquired introduced in 1963 and the Complementry steel Oxide Semiconductor (CMOS) which got introduced in 1968. In this article we will discuss about these two technologies and also how to select between CMOS and TTL IC based on your project style requirement.


What is CMOS?

CMOS is the shortened type for Complementary steel Oxide Semiconductor and also it is a an innovation for fabricating the IC’s i beg your pardon are used in various applications. CMOS is the most typical MOSFET fabrication type, it offers the complementary and symmetrical bag of the p-type and also n-type steel Oxide Field impact transistors for performing the reasonable functions. The mix of PMOS and NMOS transistor being used in a single package is displayed below.

CMOS working Technology

Various types of integrated circuits are constructed using the CMOS technology choose the microprocessors, microcontrollers, storage chips and several other digital reasonable circuits. In static analog circuits choose the data converters, picture sensors, and also transceivers, this modern technology is provided widely. CMOS propagates both logics, high and also low or the 0 and 1.

You are watching: What is an advantage of cmos logic devices over ttl devices?


What is TTL?

TTL means Transistor-transistor Logic. The is a reasonable family made up of bipolar junction transistors (BJTs). Here, both the functions (logic and amplifying) room performed through the transistors; therefore, the is called as the Transistor-Transistor Logic. Suitable example the TTL logic IC would certainly be Logic gate ICs choose the 7400 NAND or the 7402 nor Gate.


TTL is the short form of transistor-transistor logic. TTL logic supplies multiple transistors having multiple emitters and multiple inputs. The types of the transistor-transistor reasonable are conventional transistor-transistor logic, fast transistor-transistor logic, Schottky transistor-transistor logic, High power transistor-transistor logic, Low power transistor-transistor logic, and progressed Schottky transistor-transistor logic.


TTL logic entrances are consisted of of the Bipolar junction transistors and resistors. Over there are countless variants the TTL occurred for various specific purposes choose the radiation-hardened TTL packages for room applications and also Low power Schottky diodes that can provide an excellent combination of speed and lesser power consumption.


What Is The Difference in between CMOS and also TTL? which one is Better?

The advantage that the CMOS end the TTL chips is that the CMOS has actually a greater density of logic gates in ~ the very same material. TTL chips consume more power as compared to the strength consumed by the CMOS chips even at rest. The power usage of the CMOS counts on various factors and is variable. The clock rate is just one of the major factors for power consumption. Greater clock values will result in greater power consumption. As soon as making the comparisons, a solitary gate in CMOS chip would certainly consume the 10nW of strength whereas an identical gate top top the TTL chip will certainly consume approximately 10mW power. The difference is significantly high and this is why the CMOS chips are constantly preferred over the TTL chips.


When the design and fabrication space considered, no doubt that the CMOS chips are an extremely delicate and it is challenging to manage as these are extremely susceptible come electrostatic discharge. A very minute quantity of static electrical power could reason damage come the CMOS chips. Thus people often unwillingly damages their chips only by emotional the terminals that the CMOS. Some an easy differences between CMOS and also TTL are explained below:


CMOS components are normally more expensive when compared to the TTL components. Yet on system-level, CMOS chips are much less expensive as these are smaller sized in dimension as contrasted to the TTL chips.There space propagation delays present in both. On average, the propagation delays that TTL space usually 10nS conversely, the propagation delays because that the CMOS lies in between 20 to 50 nSCMOS has actually longer rise and fall times therefore digital signals are simpler and also less expensive with the CMOS chips.There is a considerable difference in the voltage level range for both. For TTL that is 4.75 V to 5.25 V while because that CMOS it ranges in between 0 to 1/3 VDD at a low level and also 2/3VDD come VDD at high levels.CMOS an innovation is more economical and also preferred an ext as compared to the TTL logic.The present requirements that the CMOS are low and also thus power consumption is limited. Therefore it is less complicated for the circuits to be designed with the best power management.The electromagnetic disruptions CMOS materials are more sensitive as compared to the TTL componentsCMOS has one other advantage over the TTL that it has allowed lower noise throughout the transmissionThe variety of standard lots that could be linked to the output of the door under the normal procedure that is the fan-out is 10 because that TTL whereas it is 50 because that the CMOS.The number of standard inputs that have the right to be linked to the door is the fan in, which is roughly 12-14 for the TTL and for the CMOS it is 10 only.CMOS circuits have better noise immunity then the TTL circuitsThe an easy gates which are used in the construction of the TTL are the NAND gate whiles both the NAND-NOR entrances are provided in the CMOS circuits.


Is CMOS a an excellent choice end TTL Component?

Comparing the TTL and CMOS reasonable families, CMOS has an ext advantage over the TTL components. It spend lesser power than the TTL and also is more economical as well. The output strength of the CMOS is greater and that is smaller sized in dimension as well. With higher immunity come the noise, these permit lower levels of noise to transmit if the infection of the singles. Also, the propagation delays are smaller and also thus carry out faster infection of the signals that the TTL circuits. With larger fan outnumber the variety of loads have the right to be associated at the output terminal the the CMOS circuit. Despite these are delicate and therefore call for care and also attention while handling them.

See more: Which One Of The Following Sentences Correctly Uses A Comparative Adjective? ?


Difference in between CMOS and also TTL - Conclusion

To compare TTL and also CMOS, one need to think around the points stated above. As the CMOS is composed of the FET’s and also the TTL circuits are made up of BJT, CMOS chips are much faster and efficient. Over there is a much higher density the the logic features in a solitary chip in CMOS as contrasted to the TTL. Also, the power intake of the TTL circuits is greater when contrasted to the power usage of CMOS. Despite the CMOS has actually lesser strength consumption, CMOS chips are more susceptible to the static electric discharge and also thus can be damaged easily. CMOS chips can have the TTL logics and could be offered for the instead of of the TTL IC.