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How many types of fuse technologies are used in PROMs?

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How many types of fuse technologies are used in PROMs?

(a) 2

(b) 3

(c) 4

(d) 5

The question was posed to me in examination.

Question is from Programmable Read Only Memory topic in section Memory Devices of Digital Circuits

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Right answer is (b) 3

The best I can explain: Fusing is a process by which programs are burnout to the diode/transistors and it can not be reprogrammed if any error occurs. Three types of fuse technologies are used in PROMs and these are: (i) Metal links, (ii) Silicon links, & (iii) p-n junctions.

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