The IC 74LS138 is a ____.

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Question

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ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 2

Answer 1

The IC 74LS138 is a 3 to 8 line decoder integrated circuit from the 74xx family.
The main function of this IC is to decode otherwise demultiplex the applications.
The decoder 74LS138 IC uses advanced technology like silicon (Si) gate TTL technology.
74LS138 IC has 3 binary select inputs like A, B & C. If the IC is activated, then these input pins will decide which of the 8 usually HIGH outputs will go LOW.
As this IC includes three enable pins (where two pins are active low and one is active high) the necessity of outside gates is not there.
These are suitable for applications like memory address decoding, data routing, etc.

Important Points