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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All articles with unsourced statements Articles with unsourced statements from October Commons erpom link from Wikidata Wikipedia articles with GND identifiers. CORE part datsheet are easily discerned once you exclude any prefix or suffix characters. Unlike Flash devices, these memory parts can have individual bytes changed without the need to erase the entire part. This page was last edited on 8 Novemberat Most devices, regardless of the technology family, can be identified by their CORE part number.

2764A Datasheet PDF

I found this auction: Could be a mil number but they usually datasheeh the mfg number and stamped their number on. The numbers on the chip are: Storing data in the memory requires selecting epro given address and applying a higher voltage to the transistors. If you are uncertain about support for a specific part, please don’t hesitate to contact us by phone or email. 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.

The programming process is not electrically reversible. The FRAM is also a non-volatime memory component however it uses ferro-electric magnetic structure to store information. The NV stands for non-volatile. EPROM programming is slow compared to other forms of memory. Whenever in doubt always start at the lowest pgm voltage. In effect, the stored charge datasheeh the floating gate allows the threshold eprmo of the transistor to be programmed.

Although not as fast, serial eeproms and nvrams find datashet in many products due to their small size and low cost. Remember, a core part number usually represents hundreds of actual part numbers due to different manufacturers, speeds, temperatures, package types and other chip characteristics. 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.


Although not used in new designs, these parts are still commonly found in older products and equipment.

2764A – 2764A 64K EPROM Datasheet

The floating-gate electrode has no connections to other parts of the integrated circuit and is completely insulated by the surrounding layers of oxide. Stored charge on these isolated gates changed their properties. He got a tractor trailer load of eproms several years ago, and put up the website epromman.

Erasure, however, has to be accomplished by non-electrical methods, since the gate electrode is not accessible electrically. The process takes several minutes for UV lamps of convenient sizes; sunlight would dataseet a chip in weeks, and indoor fluorescent lighting over several years.

The core number is normally easy to determine and serves as the industry standard description for nearly all common programmable devices with multiple manufacturers. Help me find a datasheet for these eproms. These parts must be erased before programming.

EPROM Datasheet

Magnetic tape Hard disk drive. Might be a house number epromman. By using this site, you agree to the Terms of Use and Privacy Policy.

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. Can anyone help me find datasheets on them? Yeah, we’ve worked it out already – he’s already replaced them with name brand ‘s that work just fine.

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. When the high voltage is removed, the electrons are trapped on the electrode. 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 Archived PDF from the original on The listed device numbers conform to the core numbers used by most industry standard parts.


Often this label was foil-backed to ensure its opacity to UV. Due to the number of device manufacturers, the catagories below are organized by technology family and device pin count.

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. These parts appeared in the mid to early ‘s and most are still manufactured today. Their high storage capacity allows use in computer BIOS plus other memory intensive product applications.

Like EPROM chips, such microcontrollers came in windowed expensive versions that were used for debugging and program development. They appear to be chips, but I can’t get my programmer to program them. The RAM would normally lose its contents when power is removed, however the NVRAM is manufactured with a built in battery which keeps datasyeet applied to the memory after power has been removed from the product.

Views Read Edit View history. This prompted larger capacity devices to introduce a “signature mode”, allowing the manufacturer and device to be identified by the EPROM programmer.

Once they are programmed they cannot be changed. 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. Shining eporm light on any part of an unpackaged device causes a photocurrent to flow from the floating gate back to the silicon substrate, thereby discharging the gate to its initial, uncharged condition photoelectric effect.

But I need to get an eyeball on a datasheet to figure out the specs of these chips first, to see if there’s a TTL equivalent.