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What is the order of propagation delay time of Schottky TTL gates?

What is the order of propagation delay time of Schottky TTL gates? Correct Answer 2 ns

Switching a transistor from Saturation to Cut-off results in a storage delay time which eventually results in propagation delay.

  • Schottky TTL is a relatively fast bipolar logic family, normally produced in integrated-circuit form, whose internal configuration is similar to normal TTL except that Schottky transistors are used.
  • In Schottky TTL the low cut-in voltage (forward bias voltage drop), typically 300 millivolts, limits the base-collector voltage to about 400 mV, which prevents the transistor from falling into saturation.
  • When a Schottky diode is used, it prevents the transistor to go into saturation and thereby reduces the time required to switch from saturation to cut off
  • When a Schottky diode is used, it prevents the transistor to go into saturation and thereby reduces the time required to switch from saturation to cut off.

It has a propagation delay of 2 nsec.

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