GATE (Graduate Aptitude Test in Engineering) Electronics & CE (EC) Digital Circuits-Sequential Circuits Study Material (Page 11 of 13)

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Programmable Logic Devices

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Introduction

Most popular digital ICs were TTL logic family till at least in India. Today they are hardly used in industrial applications. They are used only in education field for learning the concepts of digital electronics. They are very rapidly replaced by new kind of devices called as Programmable Logic Devices (in short PLDs)

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SPLDs (PROM, PLA, GAL, ASIC)

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All the programmable basically carry combination of OR array and array. With the help of the links different programming devices are obtain. Basically, it implements SOP (Sum of the Products) types expressions. Depending upon ability of programming the SPLDs are of the following types:

PROM

It consists of fixed or nonprogrammable AND array connected as address decoder and programmable OR array as a memory.

Block Diagram of PROM

PLA

It consists of a programmable AND array and program…

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