The Transistor-Transistor Logic was further improved by improving the speed and power consumption of the devices. IBM designed and manufactured the 7400 series which is not compatible with others companies’ devices. The compatible parts of the 7400 series families of Texas were then designed and manufactured by the companies like National Semiconductor, AMD, Motorola, Intel, Fairchild, Signetics, Intersil, Mullard, SGS-Thomson, Siemens, Rifa, etc. In 1966, the 7400 series was launched through a narrower temperature range. Afterward, Transistor-Transistor Logic (TTL) became very popular. In the year 1964, Texas instruments developed and launched the 5400 series TTL ICs for military applications that need a wide range of operating temperatures of ICs. The device is also known as SUHL or the ‘ Sylvania Universal High-Level Logic family’. In 1963, Sylvania manufactured TTL devices on a commercial scale. The TTL is also called TCTL -Transistor-coupled transistor logic. With this invented TTL, it is possible to develop new integrated circuits. Buie of TRW invented Transistor-Transistor Logic in the year 1961. The ICs made using TTL are widely used in computers, industrial controls, electronics, etc. The first transistor performs the logic function and the second transistor performs the amplification function. 
The transistor-transistor logic is built with the help of bipolar junctio n transistors (BJTs). There are many logic families like RTL (Resistor-transistor logic), DTL (Diode-Transistor Logic), TTL (Transistor-Transistor Logic), ECL (Emitter-Coupled Logic), and CMOS (Complementary Metal Oxide Semiconductor Logic). Introduction to transistor-transistor logic (TTL Logic) The N and P are doped semiconductor materials.
There are two types of BJTs, and they are- NPN and PNP-type bipolar junction transistors.
For the amplification process, a BJT does not need any DC power source. The low amplitude input signal is applied at the base, and its amplified form is available at the collector terminal. These terminals are called emitter, base, and collector. Many TTL logic gates made up of transistors are fabricated on a single integrated circuit( IC) or chip.īJT has two p-n junctions that are capable of amplifying the input signal. Transistor Transistor logic (TTL logic) has transistors as a basic building element.
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