Donor challenge: Your generous donation will be matched 2-to-1 right now. Your $5 becomes $15! Dear Internet Archive Supporter,. I ask only. Description: The NTE is a 65,–bit ( X 8 bit) Ultraviolet Erasable and Electrically Programmable. Read–Only Memory (EPROM) in a 28–Lead DIP. Details, datasheet, quote on part number: Two Line Output Control Because EPROMs are usually used in larger memory arrays, the product features a 2.

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Retrieved from ” https: This prompted larger capacity devices to introduce a “signature mode”, allowing the manufacturer and device to be identified by the EPROM programmer. In other words, dattasheet erase your EPROM, you would first have to X-ray it and then put it in an oven at about degrees Celsius to anneal semiconductor alterations caused by the X-rays. All articles with unsourced statements Articles with unsourced statements from October Commons category link from Wikidata Wikipedia articles with GND identifiers.

I can read them and erase them, but I can’t program them. FWIW, Dennis at epromman. If you are uncertain about support for a specific part, please don’t hesitate to contact us by phone or email. Additional eporm about this technology family.

Even dust inside the package can prevent some cells from being erased. The floating-gate electrode has no connections to other parts of the integrated circuit and is completely insulated by the surrounding layers of oxide. 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. Help me find a datasheet for these eproms. Since the individual listing of every part number from every manufacturer creates a prohibitively large list, we list datasheeh supported manufacturers in a separate table with core part numbers arranged by technology family and wprom count where applicable.

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Paper data storage Drum memory Magnetic-core memory Plated wire memory Core rope memory s Thin-film memory Disk pack Twistor memory — Bubble memory — Floppy disk Since the whole memory array is exposed, all the memory is erased at the same time.

Microcontrollers are usually found in products which perform a single function such as microwave ovens, computer printers, automatic sprinkler controllers, etc.

IC Datasheet: 2764 EPROM

By using this site, you agree to the Terms of Use and Privacy Policy. Each bit of the word is a 1 or 0, depending on the storage transistor being switched on or off, conducting or non-conducting. These parts do not datasbeet a battery and maintain their information as an array of magnetic charges.

Yeah, we’ve worked it out already – he’s already replaced them with name brand ‘s that work just fine. Due to the vatasheet of device manufacturers, the catagories below are organized by technology family and device pin count. You get what you pay for when you order adtasheet him. Often this label was foil-backed to ensure its opacity to UV. The listed device numbers conform to the core numbers used by most industry standard parts. Each field-effect transistor consists of a channel in the semiconductor body of the device.

2764A Datasheet PDF

These parts appeared in the mid to early ‘s and most are still manufactured today. The CORE part number for each device is Archived PDF from the original on They appear to be chips, but I can’t get my programmer to program them. EPROMs had a limited but large number of erase cycles; the silicon dioxide around the gates would accumulate damage from each cycle, making the chip unreliable after several thousand cycles.


Like EPROM chips, such microcontrollers came in windowed expensive versions that were used for debugging and program development. Once programmed, an EPROM can be erased by exposing it to strong ultraviolet light source such as from a mercury-vapor light.

It is an array of floating-gate transistors individually programmed by an electronic device that supplies higher voltages than those normally used in digital circuits.

Their high storage capacity allows use in computer BIOS plus other memory intensive product applications. For large volumes of parts thousands of pieces or moremask-programmed ROMs are the lowest cost devices to produce. Initially, it was thought that the EPROM would be too expensive for mass production use and that it would be confined to development only. This page was last edited on 8 Novemberat I found this auction: Might be a house part number.

The effects of this process on the reliability of the eprmo would have required extensive testing so they decided on the window instead. If they are A and you programmed at standard voltage they are probably dead now.

Hi all, Picked up a couple dozen of these eproms a few months back, and I’m having trouble with them.

A Datasheet(PDF) – STMicroelectronics

To erase the data ratasheet in the array of transistors, ultraviolet light is directed onto the die. He got a tractor trailer load of eproms several years ago, and put up the website epromman. These parts must be erased before programming.