totem pole output transistor transistor logic

The voltage supply drops in R1 and the transistor T2 turns OFF because it has not had enough voltage to turn ON. The current goes to the ground via the D1&D2 and the resistor R1 due to the supply voltage VCC of 5V. When both the inputs are LOW, diodes D1 and D2 get forward biased. The output is LOW, which represents logic 0. The transistor T4 and the diodes at the emitter are forward biased and a negligible amount of current flows. When the inputs A and B are HIGH, the transistors T2 and T3 turn ON and act as common-emitter amplifiers. The circuit is designed as a high-performance TTL NAND gate where NAND elements are four-pair inputs of type 74H00 or 54H00. The operating speed and power dissipation are higher than low-power TTL. The high power TTL is the high-speed version of standard TTL. This TTL Schottky is further subdivided into many types such as Low Power Schottky, Low Power Schottky, and Extended Schottky TTLs. The Schottky transistor used in this type of TTL is nothing more than a bipolar transistor, the base, and collector of which are connected by a Schottky diode.

The circuit design is very similar to high-power TTL. The power dissipation is the same for both TTLs and there is no additional power consumption. The speed offered by this type of TTL is twice that of high-power TTL. It is used in various applications in a combination with speed and dissipation. These are used as glue logic, which can connect more complex devices in digital systems. This is the first TTL IC developed in the year 1965 to perform basic logic functions. The most important feature of the TTL device is that the inputs of the gate will be logic high (1) if they are not connected.

Transistor-transistor logic (TTL) is an integrated circuit that performs a logic function to provide a switching function by using bipolar transistors. What is Transistor-Transistor Logic Or TTL? This article gives a brief description of the internal structure and working of a transistor-transistor logic circuit with a 2-input NAND gate function. It is widely used in various applications such as electronic devices, computer control systems, industrial controlling systems, the design and fabrication of integrated circuits, and many more. It belongs to the digital logic family and is designed with bipolar transistors, resistors, and diodes. The concept of TTL was developed to achieve high speed, low power dissipation that allows optimization of the design. In 1963, Sylvania as Sylvania Universal High-Level Logic (SUHL) introduced the first Transistor- Transistor Logic circuits.

Totem pole output transistor transistor logic