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In IC (integated circuit) chips TTL stands for (Transistor Transistor Logic) which means that the chip incorporates bipolar transistors to provide both input logic and output power drive stage switching functions. In a CMOS chip a different type of device is used in switching. The (FET) Field Effect Transistor is used but in a chip it is more commonly known as the MOS FET. Since the MOS FET operates on different principles it is favored in chip operation since it operates at cooler temperatures in which heat is one of the greatest enemies of any IC. High speed switching capability is greatly increased because of this factor. In the replacement of IC's of this type safe handling precautions should be observed and anti-static wrist straps with ground wires attached to ground should be worn. This is used to drain static as the chip may be destroyed otherwise. FET devices are designed with internal resistors to drain off static, but I would observe all precautions to be on the safe side.

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