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How memory expansion is done?

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How memory expansion is done?

(a) By increasing the supply voltage of the Memory ICs

(b) By decreasing the supply voltage of the Memory ICs

(c) By connecting Memory ICs together

(d) By separating Memory ICs

The question was asked in class test.

The query is from Programmable Logic Array topic in portion Memory Devices of Digital Circuits

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Right choice is (c) By connecting Memory ICs together

Easiest explanation: Memory ICs can be connected together to expand the number of memory words or the number of bits per word.

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