Ttl (Transistor-Transistor Logic)
1. Transistor-transistor logic (TTL) is a class of integrated circuits which maintain logic states and achieve switching with the help of bipolar transistors.
2. Transistor-transistor logic (TTL) is a digital logic design in which bipolar transistor s act on direct-current pulses.
A transistor-transistor logic device makes use of transistors with multiple emitters in gates having multiple inputs. There are different sub-categories or families for transistor-transistor logic, such as:
• Standard transistor-transistor logic;
• Fast transistor-transistor logic;
• Schottky transistor-transistor logic;
• High power transistor-transistor logic;
• Low power transistor-transistor logic;
• Advanced Schottky transistor-transistor logic.
One of the biggest benefits of using transistor-transistor logic is the relative easiness in interfacing different circuits and the ability to produce complex logic functions. This is mainly due to good noise margins as well as guaranteed voltage levels. Transistor-transistor logic has good “fan in” feature, meaning the number of input signals that can be accepted by an input. Transistor-transistor logic is largely immune to damage from static electricity discharges, unlike CMOS, and are also relatively inexpensive compared to CMOS.
One major disadvantage of transistor-transistor logic is its high current consumption. The heavy current demands of transistor-transistor logic can lead to improper functioning due to switching of output states. Even with different transistor-transistor logic versions that are less current consuming, they are all still competitive to CMOS.
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