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Integrated-Circuit Logic Families

Q1: What is unique about TTL devices such as the 74S00?

A The gate transistors are silicon (S), and the gates therefore have lower values of leakage current.

B The S denotes the fact that a single gate is present in the IC rather than the usual package of 2–6 gates.

C The S denotes a slow version of the device, which is a consequence of its higher power rating.

D The 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.

ANS:D - The 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.

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