Donor challenge: Your generous donation will be matched 2-to-1 right now. Your $5 becomes $15! Dear Internet Archive Supporter,. I ask only. Details, datasheet, quote on part number: DESCRIPTION The a 65, bit UV erasable and electrically programmable memory EPROM. It is organized. High speed performance. – ns access time available. • CMOS Technology for low power consumption. – 20 mA Active current. – µA Standby current.

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Magnetic tape Hard disk drive. 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.

Each bit of the word is a 1 or 0, depending on the storage transistor being switched on or off, conducting or non-conducting. What datasheett need to do will differ depending the machine. This page was last edited on 8 Novemberat This article is just a basic primer.

EPROM Datasheet

To erase the data stored in the array of transistors, ultraviolet light is directed onto the die. Getting to grips with EPROM programming, and having the gear to do it, is worthwhile if you want to maintain a vintage computer collection.


A control gate electrode is deposited and further oxide covers it.

Willem programmers appear popular fig 2. Typically, my eraser will blank a chip in about 20 minutes. 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. There will be an icon or menu selection for this. Here is an important piece of advice. 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.

The Willem requires you to set jumpers and dip switches whereas e;rom TOP allows chip selection from software. Because higher-density parts have little exposed oxide between the layers of interconnects and gate, ultraviolet erasing becomes less practical for very large memories. Presence of a voltage on this gate creates a conductive channel in the transistor, switching it on.

Source and drain contacts are made to regions at the end of the channel. If things are Dataheet, you’re done. The recommended erasure procedure is exposure to UV light at Even dust inside the package can prevent some cells datasneet being erased.

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 incorrect voltage can kill it.


IC Datasheet: 2764 EPROM

From Wikipedia, the free encyclopedia. It was soon found that small-volume production was economical with EPROM parts, particularly when the advantage of rapid upgrades of firmware was considered. It’s almost completely unreadable.

Since the whole memory array is exposed, all the memory is erased at the same time. Often this label was foil-backed to ensure its opacity to UV.

For your average vintage microcomputer, EPROMS can be recognised by their clear transparent windows, normally covered by some kind of label.

A EPROM Datasheet

In other projects Wikimedia Commons. Each field-effect transistor consists of a channel in the semiconductor body of the device. Here is one of my efforts regarding the latter.

However the programming devices mentioned below do dataasheet these other chips. This is applied to the Vcc pin and is typically 5 volts. Often the pin-outs of the mask ROM will be different to the EPROM and some kind of “adapter” needs to be made to switch the pins around or the board circuitry altered.

Make sure you know the specs you’re dealing with.