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erasable PROM (EPROM)

An Erasable PROM (EPROM) is a rewritable Programmable Read Only Memory (PROM). It can be written to, erased and rewritten by the user, as often as required.

Erasure of stored information is accomplished by a quartz window using high-energy UV light. As a result, it is not possible to specifically erase a single memory cell, but only the entire contents of the EPROM. Changing the stored data usually requires a complete reprogramming.

Structure of an EPROM, photo: Kodak

Structure of an EPROM, photo: Kodak

An EPROM is a non-volatile memory, so it retains its stored information after the supply voltage is switched off.

EPROM with erase window, photo: Wombat

EPROM with erase window, photo: Wombat

In addition to the memory elements, which are floating-gate tansistors, an EPROM contains circuitry for programming. A variant of the EPROM is the Flash EPROM, in which the erasing process takes place via a short-term voltage discharge.

Informations:
Englisch: erasable PROM - EPROM
Updated at: 06.09.2017
#Words: 138
Links: programmable read only memory (PROM), user, information, ultraviolet (UV), light
Translations: DE
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