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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Each has the manufacturers full part number printed on the device. Each field-effect transistor consists of a channel in the semiconductor body of the device.

2764A Datasheet PDF

EPROMs are easily recognizable by the transparent fused quartz window in the epron of the package, through which the silicon chip is visible, and which permits exposure to ultraviolet light during erasing. We’ve talked several times about the eproms he’s selling.

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

A EPROM Datasheet

In other words, to 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. Views Read Edit View history.

Remember, a core part number usually represents hundreds of actual adtasheet numbers due to different manufacturers, speeds, temperatures, package types and other chip characteristics. If they are they are probably “A” version. These parts must be erased before programming.


As the quartz window is expensive to make, OTP one-time programmable chips were introduced; here, the die is mounted in an opaque package so it cannot be erased after programming — this also eliminates the need to test the erase function, further reducing cost. Retrieved from ” https: This page was last edited on 8 Novemberdatashert A microcontroller normally has 40 or more pins since the input and output operations occur directly from the chip. Can anyone help me find datasheets on them?

Photons of the UV light cause ionization within the silicon oxide, which allow the stored charge on the floating gate to dissipate. The effects of this process on the reliability of the part would have required extensive testing so they decided on the window instead.

These memory chips store the bits of data by blowing small fuses inside the memory device. From Wikipedia, the free encyclopedia. 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. Whenever in doubt always start at the lowest pgm voltage. 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 erasing window must be kept covered with an opaque label to prevent accidental erasure by the UV found in sunlight or camera flashes. Dennis didn’t want me to return these, though, so I thought I’d try and see if I could look up a datasheet on them so I could try and either made an adapter for my eprom burner to burn them, or at the very least let someone else buy them who has a programmer that will actually burn them. This approach allows you to more easily locate a device number, as many users do not know the manufacturer of the device in which they have interest.

  ATMEL 25080 PDF

Even dust inside the package can prevent some cells from being erased. If they are A and you programmed at standard voltage they are probably dead now. In effect, the stored charge on the floating gate allows the threshold voltage of the transistor to be programmed. For large volumes of parts thousands of pieces or moremask-programmed ROMs are the lowest cost devices to produce.

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.

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Might be a house part number. Exposure time for sunlight of one week or three years for room fluorescent lighting may cause erasure. Might be a house number epromman. Additional information about this technology family.

The daasheet generation devices were fabricated with the p-MOS techology. All articles with unsourced statements Articles with unsourced statements from October Commons category link from Wikidata Wikipedia articles with Eprpm identifiers.

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 Non-volatile memory Integrated circuits Computer memory.

The programming process is not electrically reversible. The example below describes how to determine a typical core part number. Like EPROM chips, such microcontrollers came in windowed expensive versions that were used for debugging and program development.

Since the whole memory array is exposed, all the memory is erased at the same time.