Q. What is unique about TTL devices such as the 74SXX? (Solved)
1. these devices use schottky transistors and diodes to prevent them from going into saturation; this results in faster turn-on and turn-off times, which translates into higher frequency operation.
2. the gate transistors are silicon (s), and the gates therefore have lower values of leakage current.
3. the s denotes the fact that a single gate is present in the ic rather than the usual package of 2–6 gates.
4. the s denotes a slow version of the device, which is a consequen ce of its higher power rating.
- a. these devices use schottky transistors and diodes to prevent them from going into saturation; this results in faster turn-on and turn-off times, which translates into higher frequency operation.