TTL (Transistor-Transistor Logic) is a digital logic family that uses bipolar junction transistors (BJTs) for both logic and amplifying functions.
0V – 0.8V
(LOW), 2.0V – 5V
(HIGH)Series | Description |
---|---|
74 | Standard TTL |
74LS | Low Power Schottky (lower power, faster than standard) |
74S | Schottky (high speed, higher power) |
74AS/ALS | Advanced versions (faster or lower power) |
Note: TTL inputs should never be left floating — tie unused inputs HIGH or LOW.
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