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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EPROMs had a limited but large number of erase cycles; the darasheet dioxide around the gates would accumulate damage from each cycle, making the chip unreliable after several thousand cycles.
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 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.
Stored charge on these isolated gates changed their properties.
IC Datasheet: 2764 EPROM
But if you know what to ask for, he can still set you up with what you need. CORE part numbers are easily discerned once you exclude any prefix or suffix characters.
Source and drain contacts are made to regions at the end of the channel. However, these require many weeks lead time to make, since the artwork for an IC mask layer must be altered to store data on the ROMs.
A Datasheet(PDF) – STMicroelectronics
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. This page was last edited on 8 Novemberat Microcontrollers are usually found in products which perform a single function such as microwave ovens, computer printers, automatic sprinkler controllers, etc. Archived PDF daatsheet the original on These parts must be erased before programming. Additional information about this technology family.
I’ll give that programming mode a shot! These parts appeared in the mid to early ‘s and most are still manufactured today. An insulating layer of oxide is grown over the channel, then a conductive silicon or aluminum gate electrode is deposited, and a datasyeet thick layer of oxide is deposited over the gate electrode.
Photons of the UV light cause ionization dataaheet the silicon oxide, which allow the stored charge on the floating gate to dissipate. The floating-gate electrode has no connections to other parts of the integrated circuit and is completely insulated by the surrounding layers of oxide.
Just got a lot of these dtaasheet Epromman and did a google search came across your post 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.
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.
2764A Datasheet PDF
The same chip came in somewhat cheaper opaque OTP packages for production. Even dust inside the package can prevent some cells from being erased.
A control gate electrode is deposited and further oxide covers it. EPROMs are easily recognizable by the transparent fused quartz window in the top of the package, through which the silicon chip is rprom, 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.
Yeah, we’ve worked it out already – he’s already replaced them with name brand ‘s that work just fine. A programmed EPROM retains its data for a minimum of ten to twenty years,  with many still retaining data after datasheer or more years, and can be read an unlimited number of times without affecting the lifetime.
The example below describes how to determine a typical core part number. Retrieved from ” https: This is accomplished by sending the required command, address and data serially one bit at a time over single pins instead of the multiple pins of a datashfet part.
Because higher-density parts have little exposed oxide between the layers of interconnects and gate, ultraviolet erasing becomes less practical for very large memories. If you are uncertain about support for a specific part, please don’t hesitate to contact us by phone or email.
This creates an avalanche discharge of electrons, which have enough datasheeet to pass through the insulating oxide layer and accumulate on the gate electrode. Whenever in doubt always start at the lowest pgm voltage.
The programming process is not electrically reversible. Development of the EPROM memory cell started with investigation of faulty integrated circuits where the gate connections of transistors had broken.
In effect, the stored charge on the floating gate allows the threshold voltage of the transistor to be programmed. Magnetic tape Hard disk drive.
IC Datasheet: EPROM : Free Download, Borrow, and Streaming : Internet Archive
The CORE part number is easily identified and has been hi-lited. Can anyone help me find datasheets on them? Each bit of the word is a 1 or 0, depending on the storage transistor being switched on or off, conducting or non-conducting. Once programmed, an EPROM can be erased by exposing it to strong ultraviolet light source such as from a mercury-vapor light. Often this label was foil-backed to ensure its opacity to UV.