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Programmable read-only memory (PROM) refers to a type of ROM which can be written using a PROM programmer. This is an alternative to traditional ROM chips, which are normally mass-produced.

Description

The contents of each bit in a PROM is determined by a fuse or antifuse. The memory can be programmed once after manufacturing by "blowing" the fuses, which is an irreversible process. Blowing a fuse opens a connection while blowing an antifuse closes a connection (hence the name). Programming is done by applying high-voltage pulses which are not encountered during normal operation.[1] An alternative to earlier nickel-chromium fuses are polyfuses, which are used in smaller production runs of Programmable Array Logic chips.

References

  1. ↑ Programmable Read-Only Memory at the Free On-Line Dictionary Of Computing. 1996-09-17.

External links

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