Donor challenge: Your generous donation will be matched 2-to-1 right now. Your $5 becomes $15! Dear Internet Archive Supporter,. I ask only. Details, datasheet, quote on part number: DESCRIPTION The a 65, bit UV erasable and electrically programmable memory EPROM. It is organized. High speed performance. – ns access time available. • CMOS Technology for low power consumption. – 20 mA Active current. – µA Standby current.

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Furthermore, the article doesn’t cover all of the theory and physics. From Wikipedia, the free encyclopedia.

2764A – 2764A 64K EPROM Datasheet

Datazheet erase the data stored in the array of transistors, ultraviolet light is directed onto the die. A programmed EPROM retains its data for a minimum of ten to twenty years, [5] with many still retaining data after 35 or more years, and can be read an unlimited number of times without affecting the lifetime.

Often this label was foil-backed to ensure its opacity to UV. This is why the ICs have a clear window in them; to allow the Eeprom light to penetrate and erase the data. The process takes several minutes for UV lamps of convenient sizes; sunlight would erase a chip in weeks, and indoor fluorescent lighting over several years.

A couple of VCF folks helped me refine this article. Try 20 minutes first and if that doesn’t fully erase the chip try again with a longer interval until you find a time span that does.

The same chip came datashdet somewhat cheaper opaque OTP packages for production. EPROMs are easily recognizable by the transparent fused quartz window in the top of the package, through which the silicon chip is visible, and which permits exposure to ultraviolet light during erasing. This page was last edited on 8 Novemberat TOPS software showing a binary loaded into the buffer and ready to go!


There are 8 kilobits in a kilobyte.

EPROM – Wikipedia

Photons of the UV light cause ionization within the silicon oxide, which allow the stored charge on the floating gate to dissipate. Willem programmers appear popular fig 2. The Willem requires you to set jumpers and dip switches whereas my TOP allows chip selection from software. Since the whole memory array is exposed, all the memory is erased at the same time. The effects of this process on the reliability of the part would have required extensive testing so they decided on the window instead.

These are explained in this Google Groups postingwhich also elaborates on the and series and how they differ from or, in the case of theare the same as 27xx EPROMS of the same size. Cambridge University Press, p. While parts of the same size from different manufacturers are compatible in read mode, different manufacturers added different and sometimes multiple programming modes leading to subtle differences in the programming process.

The erasing window must be kept covered with an opaque label to prevent accidental erasure by the UV found in sunlight or camera flashes.

This creates an avalanche discharge of electrons, which have enough energy to pass through the insulating oxide layer and accumulate on the gate electrode.

Magnetic tape Hard disk drive. Mask ROMS have embedded code that can’t be changed. Rather it provides enough practical tips and information for readers to attempt an EPROM replacement of failed compatible parts. With the chip in place, the first step is epprom load the code into a buffer prior to burning it into the EPROM. Computer memory that can retrieve stored data after a power supply vatasheet been turned off and back on is called non-volatile.


Non-volatile memory Integrated circuits Computer memory. Otherwise there is great risk of zapping the ROM because voltage is applied to the wrong pin! An insulating layer of oxide is grown over the channel, then a conductive silicon or aluminum gate electrode is deposited, and a further thick layer of oxide is deposited over the gate electrode.

Typical values are 25v, 21v or It seems to work well, although at the time of writing the manual for this Chinese device appears to have been written using an early version of Google Translator!

IC Datasheet: 2764 EPROM

Some EPROMS don’t have a window and are not erasable even though they have the same part number as the erasable version.

There will be an icon or menu selection for this. By datazheet this site, you agree to the Terms of Use and Privacy Policy. The floating-gate electrode has no connections to other parts of the integrated circuit and is completely insulated by the surrounding layers of oxide.