advanced Schottky TTL (logic) (AS-TTL)
There are several TTL log ics(Transistor Transistor Logic) working with Schottky diodes. These include Schottky TT L( S-TTL), Low Power Schottky TTL( LS-TTL), Advanced Schottky TTL( AS-TTL) and Advanced Low Power Schott ky TTL ( ASL-TTL).
The Advanced Schottky TTL (AS-TTL) has the shortest switching time of all TTL logics at 1.7 ns. The power dissipation is about 8 mW per TTL logic. AS-TTL logics have the letters "AS" in the type designation 74AS00.