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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But if you know what to ask for, he can still set you up with what you need. These parts must be erased before programming. 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.

Most devices, regardless of the technology family, can be identified by their CORE part number. The numbers on the chip are: 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.

IC Datasheet: 2764 EPROM

EPROMs are easily recognizable by the transparent fused quartz fatasheet in the top of the package, through which the silicon chip is visible, and which permits exposure to ultraviolet light during erasing. 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. I can read them and erase them, but I can’t program them. The erasing window must be datashret covered with an opaque label to prevent accidental erasure by the UV found in sunlight or camera flashes.

EPROM Programmer Device Support

The FRAM is also a non-volatime memory component however it uses ferro-electric magnetic structure to store information. 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.


Presence of a voltage on this gate creates a conductive channel in the transistor, switching it on. Erasure, however, has to be accomplished by non-electrical methods, since the gate electrode is not accessible electrically.

eprom PINOUT datasheet & applicatoin notes – Datasheet Archive

Each field-effect transistor consists of a channel in the semiconductor body of the device. These parts are always in plastic cases because the erasing of the part is done electrically without the need to expose the internal chip to ultraviolet light.

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.

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

These memory chips store the bits of data by blowing small fuses inside the memory device. All articles with unsourced statements Articles with unsourced statements from October Commons category link from Wikidata Wikipedia articles with GND identifiers.

In effect, the stored charge on the floating gate allows the threshold voltage of the transistor to be programmed.

However, as this was not universal, programmer software also would allow manual setting of the manufacturer and device type of the chip to ensure proper programming. Initially, it was thought that the EPROM would be too expensive for mass production use and that it would be confined to development only. The CORE part number for each device is Datasheeet floating-gate electrode has no connections to other parts of the integrated circuit and is completely insulated by the surrounding layers of oxide.


Retrieved from ” https: Due to the number of device eptom, the catagories below are organized by technology family and device pin count. EPROM programming is slow compared to other forms of memory. This creates an avalanche discharge of electrons, which have enough energy to pass through the insulating oxide layer and accumulate on the gate electrode. The CORE part number is easily identified and has been hi-lited.

If they are A and you programmed at standard voltage they are probably dead now. Once programmed, an EPROM can be erased by exposing it to strong ultraviolet light source such as from a mercury-vapor light.

Because higher-density parts have little exposed oxide between the layers of interconnects and gate, ultraviolet erasing becomes less practical for very large memories. We’ve talked several times about the eproms he’s selling.

2764A – 2764A 64K EPROM Datasheet

Even dust inside the package can prevent some cells from being erased. In other projects Wikimedia Commons. The core number is normally easy to determine and serves as the industry standard description for nearly all common programmable devices with multiple manufacturers.

To retrieve data from the EPROM, the address represented by the values at the address pins of the EPROM is decoded and used to connect one word usually an 8-bit byte of storage to the output buffer amplifiers.

He’s nearly out of the most common eproms, and has since been buying used pulls and bulk buys from china to meet demand and fill orders.

If they are they are probably “A” version. These parts do not have a battery and maintain their information as an array of magnetic charges. Might be a house number epromman.