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 silicon dioxide around the gates would accumulate damage from each datashset, making the chip unreliable after several thousand cycles. Cambridge University Press, p. You get what you pay for when you order from him.

Yeah, we’ve worked it out already – he’s already replaced them with name brand ‘s that work just fine.

EPROMS , , , , , , ,

EPROM programming is slow compared to other forms of memory. When the high voltage is removed, the electrons are trapped on the electrode. If you are uncertain about support for a specific 27644, please don’t hesitate to contact us by phone or email.

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. The CORE part number is easily identified and has been hi-lited.

However, these require many weeks lead time to make, since the artwork for an IC mask datwsheet must be altered to store data on the ROMs. The listed device numbers conform to the core numbers used by most industry standard parts. However, as this was not universal, programmer software also would allow manual setting of the manufacturer and satasheet type of the chip to ensure proper programming.


Each has the manufacturers full part number eprlm on the device. Due to the number of device manufacturers, the catagories below are organized by technology family and device pin count.

If they are A and you programmed at standard voltage eprim are probably dead now. The erasing window must be kept covered with an opaque label to prevent accidental erasure by the UV found in sunlight or camera flashes. The recommended erasure procedure is exposure to UV light at Might be a house number epromman. Often this label was foil-backed to ensure its opacity to UV. The same chip came in somewhat cheaper opaque OTP packages for production.

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

2764A Datasheet PDF

We’ve talked several times about the eproms he’s selling. 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.

This page datassheet last edited on 8 Novemberat Exposure time for sunlight of one week or three years for room fluorescent lighting may cause erasure. They appear to be chips, but I can’t get my programmer to program them. Because higher-density parts have little exposed oxide between the layers of interconnects and gate, ultraviolet erasing becomes less practical for very large memories.


Magnetic tape Hard disk drive. Initially, it was thought that the EPROM would be too expensive for mass production use and that it would be confined to development only. Hi all, Picked up a couple dozen of these eproms a few months back, and I’m dahasheet trouble with them. Can anyone help me find datasheets on them?

EPROM – Wikipedia

These parts appeared in the mid to early ‘s and most are still manufactured today. 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.

Each field-effect transistor consists of a channel in the semiconductor body of the device. The CORE part number for each device is Since the individual listing of every part number from every manufacturer creates a prohibitively large list, we list all supported manufacturers in a separate table with core part numbers arranged by technology family and pin count where applicable.

In other projects Wikimedia Commons. Might be a house part number.