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Which IC is known as bipolar ROM?

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Which IC is known as bipolar ROM?

(a) IC 74187

(b) IC 74189

(c) IC 74188

(d) IC 74186

This question was posed to me by my college professor while I was bunking the class.

My question is based upon Read Only Memory (ROM) in division Memory Devices of Digital Circuits

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Best answer
The correct choice is (c) IC 74188

To explain: IC 74188 is known as bipolar ROM since it is made up of TTL logic.

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