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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Remember, a core part number usually represents hundreds of actual part numbers due to different manufacturers, speeds, temperatures, package types and other chip characteristics. He got a tractor trailer load of eproms several years ago, and put up the website epromman. The first generation devices were fabricated with the p-MOS techology. 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.

Even dust inside the package can prevent some cells from being erased. Digital Design and Fabrication. I’ll give that programming mode a shot! 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.

The listed device numbers conform to the core numbers used by most industry standard parts. These parts appeared in the mid to early ‘s and most are still manufactured today. This page was last edited on 8 Novemberat This prompted larger capacity devices to introduce a “signature mode”, allowing the manufacturer and device to be identified by the EPROM programmer.

Once programmed, an EPROM can be erased by exposing it to strong ultraviolet light source such as from a mercury-vapor light. Each has the manufacturers full part number printed on the device. 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.

Most devices, regardless of the technology family, can be identified by their CORE part number. 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.


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. Exposure time for sunlight of one week or three years for room fluorescent lighting may cause erasure. The NV stands for non-volatile.

Since the whole memory array is exposed, all the memory is erased at the same time. The RAM would normally lose its contents when power is removed, however the NVRAM is manufactured with a built in battery which keeps power applied to the memory after power has been removed from the product. Microcontrollers are usually found in products which perform a single function such as microwave ovens, computer printers, automatic sprinkler controllers, etc.

A microcontroller normally has 40 or more pins since the input datazheet output operations occur directly from the chip.

IC Datasheet: EPROM : Free Download, Borrow, and Streaming : Internet Archive

CORE part numbers are easily discerned once you exclude any prefix or suffix characters. The erasing window must be kept covered with an opaque label to prevent accidental erasure by the UV found in sunlight or camera flashes. In other projects Wikimedia Commons. Yeah, we’ve worked it out already – he’s already replaced them with name brand ‘s that work just fine. The recommended erasure procedure is exposure to UV light at The core number is normally easy to determine and serves as the industry standard description for nearly all common programmable devices with multiple manufacturers.

2764A – 2764A 64K EPROM Datasheet

Unlike Flash devices, these memory parts can have individual bytes changed without datasheeet need to erase the entire part. A core part number is a number which identifies a device regardless of the manufacturer.

Once they are programmed they cannot be changed. The effects of this process on the reliability of the part would have required extensive testing so they decided on the window instead. Although not as fast, serial eeproms epro nvrams find use in many products due to their small size and low cost. If datawheet are A and you programmed at standard voltage they are probably dead now. We’ve talked several times about the eproms he’s selling.

Whenever in doubt always start at the lowest pgm voltage. By using this site, you agree to the Terms of Use and Datasheey Policy. 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.


2764A Datasheet PDF

Each dqtasheet transistor consists of a channel in the semiconductor body of the device. For large volumes of parts thousands of pieces or moremask-programmed ROMs are the lowest cost devices to produce.

However, as this was not universal, programmer software also would allow manual setting of the manufacturer and device eprkm of the chip to ensure proper programming. From Wikipedia, the free encyclopedia. The example below describes how to determine a typical core part number. As the quartz window is eprim 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.

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 Photons of the UV light cause ionization within the silicon oxide, eprm allow the stored charge on the floating gate to dissipate.

Presence of a voltage on this gate creates a conductive channel in the transistor, switching it on.

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. The CORE part number for each device is Their high storage capacity allows use in computer BIOS plus other memory intensive product applications.

The floating-gate electrode has no connections to other darasheet of the integrated circuit and is completely insulated by the surrounding layers of oxide. The same chip came in somewhat cheaper opaque OTP packages for production. Hi all, Picked up a couple dozen of these 2746 a few months back, and I’m having trouble with them. 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 datashewt.