TTL Full Form in Electronics, Standard, Lower and High Power

The full form of TTL is Transistor Transistor Logic. The main elements employed in the creation of this logic family are NPN transistors, PN junction diodes, and diffused resistors. The NAND gate is the most basic member of the numerous subfamilies that make up this logic family. This logic gate also has additional subfamilies that include conventional TTL, advanced Schottky TTL, low power TTL, Schottky TTL, high power TTL, and rapid TTL. To help you comprehend this family more thoroughly, this article will go into greater detail about its internal structure as well as some of its defining characteristics.

TTL Applications

The following are some examples of TTL applications.

• Controller applications use TTL to supply voltages in the 0 to 5 V range.
• Relays and driving lamps both make use of it as a switching mechanism in their construction.
• Central Processing units of microcomputers also use TTL. These include minicomputers such as DEC VAX.
• It has applications in printers as well as video display terminals.

Standard TTL

For its logic operations, standard TTL employs a quad two-input type NAND gate. Additionally, it has four 5400/740 circuits. The precise operation of the circuit for this type of TTL has been covered in the paragraphs that follow.

This particular variety of NAND gate is analogous to the connection that is made between the base and emitter terminals of two transistors. Diodes with the labels D2 and D3 cap the negative input voltages.

Lower Power TTL

This is a member of the large family of the main family. Lower Power TTL is the name given to it due to the fact that it consumes less power and wastes less of it. In spite of the fact that the process can be completed in an overall more relaxed manner. For the sake of this particular application, a quad two-input NAND gate, such as the 74L00 or the 54L00, is utilized.  With the exception of the resistance, which has a higher value, this particular type of TTL's structure is nearly comparable to that of ordinary TTL. The power that the circuit can dissipate has decreased as a result of the higher resistance value.

High Power TTL

The high-power TTL is the standard TTL. High Power TTL is enhanced to a faster speed in contrast to the low-power TTL. This specific type of TTL operates at a substantially faster rate than the one previously described. This TTL has a substantially higher power dissipation than other TTLs that have been discussed in the past.

The accompanying diagram shows an example of a high-power TTL NAND gate. The NAND gate has two outputs and four inputs, and it might be of type 74H00 or 54H00. Both the rate of operation and the rate of power dissipation are accelerated with regard to these specific types of TTLs.

Schottky TTL

One such TTL subfamily is the Schottky TTL subfamily. The aim of this layout was to speed up the process while still maintaining its high quality. The speed offered by this kind of TTL is twice as fast as the speed offered by the alternative high-power TTL. There is no increased power consumption because the power dissipation of both of these TTLs is the same. 

With the exception of the removal of the Q transistor present in the high-power TTL, the circuit design is quite similar to that of a high-power TTL. The Schottky transistor is made by sandwiching a Schottky diode between a bipolar transistor's base and collector. TTL transmission uses this sort of transistor. The advanced low-power Schottky and advanced Schottky subjects of this Schottky TTL are not discussed because of their complexity. Other subtypes of this Schottky TTL include low-power and advanced low-power Schottky.

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