Coloured SEM of surface of an EPROM silicon chip

Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: EPROM silicon chip. Coloured Scanning Electron Micrograph (SEM) of the etched surface of part of an EPROM silicon chip. Here, narrow tracks form part of the chip's circuitry; at left are rows of memory cells. This is an integrated circuit. The chip is of the EPROM type: Eraseable, Programmable, Read-Only Memory. EPROM chips are programmed by applying a voltage across selected connecting pins. The memory cells can be switched electrically so that the chip stores the information programmed into it. By shining ultra- violet light on the chip, the programming is erased and it can then be reprogrammed. Magnification: x180 at 6x4.5cm size.

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Keywords: chip, electron micrograph, electronic, electronics, eprom, eprom chip, high-tech, integrated circuit, microchip, scanning, sem, silicon, silicon chip, technology

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